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1. 1 8W 1 49 9K resistor Yellow White White Red Brown This part was added in version 3 0 If you don t have one you may have a version 2 0 kit 1N5818 or 1N5817 etc Schottky Diode 1N5818 1 Adafruit Industries http learn adafruit com minty boost Page 18 of 99 LOUH power inductor at an least 1A current capability ae X1 USB type A female jack Generic 2 x AA battery holder ue Y 2463 a Adafruit PCB Circuit board induce Schematic for v3 0 Adafruit Industries http learn adafruit com minty boost Page 19 of 99 3V battery 55 Ce 0 54 ml ze Cr onc EE mr F3 l Tl a 2 D a 4 GNO GND T Parts list for v2 0 This kit version was discontinued August 2010 and replaced with version 3 0 Image Name Description Distributor Qty 5V boost converter c 4 LT1302CN8 5 for v2 0 ICI 8 pin socket Generic 1 Power supply capacitor C4 C3 Generic 2 220uUF 6 3V Adafruit Industries http learn adafruit com minty boost Page 20 of 99 Adafruit Industries Ceramic 5 C1 C2 Bypass capacitor O 1uF Capacitor 15K 1 4W 5 resistor brown green orange gold R4 R5 These were included for Generic 2 older iPods and devices 100K 1 4W 5 resistor brown black yellow gold Alternatives for R4 R5 for Generic 2 the latest iPods classic nano video 1N5818 or 1N5817 etc Schottky Diode 1N5818 1 LOUH power inductor at RLB9012 10 1 an least
2. Adafruit Industries http learn adafruit com minty boost Page 11 of 99 indicated even if they re difficult to find in your area All documentation is on the site can t provide any support or help to DlYer s because of the time and difficulty in debugging these projects Please endeavor to work out your project on your own Do you have any high rez photos Try e Standard issue iPod charging photo http adafru it c3l e PSP http adafru it c3m e Wave Bubble http adafru it c3n e Shuffle 2G http adafru it c3o e Nano 1G http adafru it c3p e Dell Mp3 player http adafru it c3q e Video iPod http adafru it c3r e Photo iPod http adafru it c3r Mintyboost is a registered trademark of Adafruit Industries Adafruit Industries http learn adafruit com minty boost Page 12 of 99 ve adafruit learning system Make it Make your own Make it This is a vey easy kit to make just go through each of these steps to build the kit 1 Tools and preparation http adafru it c3s 2 Check the parts list http adafru it c3t 3 Solder it http adafru it c3j Instructions for version 3 0 kits only 4 Put it in a case http adafru it c3u Older soldering instructions If you have an older Mintyboost or just interested in photos of soldering here you go e Version 2 0 http adafru it c3v e Version 1 x http adafru it c3w e Test v2 0 or v1 x mintyboosts http adafru it c3x Mintyb
3. Here is a basic instructional manual that will cover pretty much everything you need to know about the mintyboost you just built Compatibility So does it work with your gadget First you can always visit our compatibility list which we keep updated We have a list for versions 2 x http adafru it c3B of the kit and 3 x http adafru it c3A We try to keep the list updated as much as possible if something is not on that list then it doesn t mean it doesnt work just that we dont know Almost all devices charge fine One thing you can always do is try it out Wait until the battery is halfway drained then plug your gadget into the USB port and wait a few minutes and see if the battery inches up or if the charging light goes on You can also feel the mintyboost to see if it s warming up which would indicate it s providing power to the gadget Which batteries to use Basically get the best batteries you can New Lithium or Alkaline 1 5V batteries work great as do fully charged NiMH rechargables Old worn out or dead batteries will not work at all We have a very detailed tutorial about batteries in case you want a lot of details http adafru it c35 How to charge Easy get a USB charging cable for your gadget nearly all come with one these days you can also uSually get one for cell phones or games at an accessory shop Plug in the USB end into your mintyboost and the other end into your device That s it The gadget will dra
4. following ine D pin R4 lov sent gt 37 r pin Adafruit Industries http learn adafruit com minty boost Page 90 of 99 OK so yes when the pins are floating no charging occurs The next thing to note is that whether the pins are pulled up or down effects the current draw Since this was the first Mintyboost using the MAX756 we wanted to use the lower 100mA rate so one pin pulled down and another pulled up This would be more efficient for the battery use and keep the chip from getting hot it could provide 250mA but didn t like it much Thus was born Mintyboost v1 1 200 500o0hm Note that because the mintyboost runs from 2 AA batteries we can get 3V directly from the batteries so we connected the pullup right to the battery input The iPhone and larger iPods This worked ok for about a year then people starting getting the newer iPods and noticed that the Mintyboost didn t work anymore More testing Adafruit Industries http learn adafruit com minty boost Page 91 of 99 AI GARE BOE GEEN Hmm looks like we need to have two pull ups after all We made a new version that now had either a pulldown or pullup on the D line iPhones This worked for a bit until the iPhones came out With enormous batteries the iPhone was not happy charging at 250mA it wanted 500mA or even 1000mA to charge We sought out an upgrade to the MAX756 and found the LT1302 which could provide 500mA no pro
5. Finally carefully insert the boost converter chip Make sure the notch in the chip matches the notch in the socket If the socket was inserted backwards make sure the notch faces the flat edge of the PCB as shown Make sure the chip is seated all the way in and that the pins aren t bent Time to test Clean up the desk so there are no little wire pieces that can short the kit it s also just nice to have a clean desk We like to put down a piece of paper to ensure there s no chance of damage Then insert two fresh AA batteries alkaline or rechargeable is OK Wait a few seconds and feel the battery and chip Are they getting hot If so Adafruit Industries http learn adafruit com minty boost Page 37 of 99 remove the batteries and look over your work The kit should not even get warm Use your multimter hey you know how to use a multimeter right If not please read our voltage tutorial here http adafru it aZZ to measure the voltage in the two outer pins of the USB connector You should get a bit higher than 4 8V but lower than 5 2V If you get higher than 5 2V or lower than 4 8V first check that your multimeter has a fresh battery Really this is a really common problem If you get lower than 3V remove the batteries and check your work Next check between the rightmost pin and the second and third pin They Should both be at just about 2 0V Once you are happy with these tests remove the b
6. R1 and R3 These resistors are used by Apple iPhones and such to determine what kind of charger is connected http adafru it c3k Solder them in RAD A ee Er A e o9 S EAN _ co d ro El par A 0 oe amp No 7a200 Adafruit Industries http learn adaf ruit com minty boost Page 30 of 99 Clip the leads so it s nice and tidy The next type of part we ll place is the ceramic capacitor These are parts Cl and C2 Ceramic capacitors have a nice a property that they are symmetric non A lS OS polarized That means they can go in PES E offen either way Place the capacitor so that A D A the 2 legs leads slide thru the two metal holes in the PCB pads The capacitor will sit flat against the PCB C1 helps stabilize the output voltage and filters out high frequency noise so that the 5V output is nice and smooth Now it s time for the next capacitor C2 This capacitor is used to stabilize the internal reference of the boost converter chip This keeps the chip stable so that it will generate a voltage as precise as possible We forgot to take a photo of placing them so we stole the next photo which also shows a black and white diode don t place that yet just the two yellow blobbies Solder and clip these parts Adafruit Industries http learn adafruit com minty boost Page 31 of 99 Adafruit Industries Next is the schottky diode D1 This di
7. cost In this case I ll charge 19 50 Anything less than 10 or 20 Is great because 20 are considered to be stuff food coupons really Finishing up There s a bit more work to do First redesign the board since I m going with a radial inductor instead of an axial one ELECTRONIC a al h mh er F I e r A g ref A J i s Ea actually do another etch test to verify eveything one last time Then I tile two boards together cheaper and generate gerbers A ON 4 CAM Processor jAgeibcations ENGLE 11 cam gerbi74x cam EAGLE 4 15 I use gerbv free software for viewing and verifying the gerbers On windows use GC Adafruit Industries http learn adafruit com minty boost Page 84 of 99 prevue ee el a Geerber Witwer i LO U always check the boards with www freedfm com http adafru it c4j before ship them off to be made I used 4pcb com so it s the same company but even if you don t go with 4pcb com as your PCB manufacturer it s a neat service AGH Order Entry ChRGUITS Sag tat Ther rica CATAT MERS Chan deine ppo s aoe En hou men Ca Peo ven bend the conics ol pour Eijk Pas oat mn bop pis od Libera cet dte pn rd garrrand owe ep renale A week later depending on your turn time A box shows up with the circuit boards Adafruit Industries http learn adafruit com minty boost Page 85 of 99 Then sit in front of a computer and do a lot of web
8. 1A current capability http learn adafruit com minty boost Page 21 of 99 X1 USB type A female jack Generic 1 Keystone 2 x AA battery holder 2463 1 en Adafruit PCB Circuit board Aduse 1 Schematic for v2 0 3V battery jo T c1 c3 a GND 5 5 an _ Co T D insga eo wi 100K SW SHDN Bi 1 GND R4 PGND m e p C4 4 o Epe 100K SNS De _ i Fig Zur GND GND GND Parts list for v1 2 This is the parts list for the quite old now V1 0 to v1 2 mintyboosts http adafru it c3y Image Name Description Distributor Qty Adafruit Industries http learn adafruit com minty boost Page 22 of 99 IC1 IC1 C4 C3 C1 C2 R4 R5 Adafruit Industries 5V boost converter Digikey MAX756 CPA for v1 2 ene 8 pin socket Generic Power supply capacitor 100uF 6 3V or higher nen Ceramic Bypass capacitor 0 1uF Capacitor 15K 1 4W 5 resistor brown green orange gold These were included for SERENE older iPods and devices 100K 1 4W 5 resistor brown black yellow gold Alternatives for R4 R5 for Generic the latest iPods classic nano video http learn adafruit com minty boost Page 23 of 99 1N5818 or 1N5817 etc Schottky Diode 1N5818 1 10 22uH power inductor at Ll least 1A current capability RLB9012 10 1 X1 USB type A female jack Generic 1 Keystone 2 X AA battery holder 2463 1 eg Adafruit PCB Circuit board eee 1 Schematic for v1 2 Adafrui
9. DC switching step up regulator The process of how a boost regulator works is somewhat beyond the scope of this document Suffice to say they work great but are a little more annoying than linear regulators because you have to pick out an inductor and wire up some extra parts You can get a lot more info about Boost Converters at wikipedia http adafru it clg Case in point So at this point start thinking about enclosure and size Most people think of this last and that s a bad idea If there s one thing I ve learned from hacking on electronics it s that you Should try and select the case first because it dictates a lot of the electronics and interface Know that the parts for the kit must be all through hole no surface mount and easy to work with also want AA batteries 2 is good although I know from experience that most boost converters will work with any number from 1 and 3 just fine have a predilection for Altoids tins and also know that I can fit 2 AA s into a gum tin so I pull out a tin and take some measurements Adafruit Industries http learn adafruit com minty boost Page 64 of 99 eras The PCB mount one seems to be pretty good it doesn t have a switch but don t need one anyway see quiescient calculations below Adafruit Industries http learn adafruit com minty boost Page 65 of 99 So take some measurements Adafruit Industries http learn adafruit com minty boost Page 66 of
10. POWER AXIAL and the 6000 220K RC INDUCTOR HI CURRENT RADIAL 22UH Both of these look good with about 1 5A saturation current and 0 07 ohm DC resistance also check out Mouser http adafru it c4f The online search for mouser isn t as nice as Digikey s so lend up looking at the paper catalog instead only found one inductor really the 18R223C 22uH radial power inductor and or the 18223C axial version that also has plenty of power capacity and a 0 030hm DC resistance So order 2 of each of these Rapid prototyping 1 In reality what did was look through the Digikey catalog where only found the DN7418 inductor the other one was somewhat hidden in the RF inductor section And it showed up before the Mouser box so spent an hour or two making up a prototype The circuit itself is simple want one large electrolytic cap for low frequency smoothing on the battery and an output cap pair electrolytic and one ceramic cap for high freq smoothing also need the chip a reference voltage capacitor the inductor and a schottky diode to finish off the boost regulator happen to have some 1N5818 s which are often used as schottky diodes in boost regulators also need a USB type A female jack of course and two holes to solder the battery pack into Adafruit Industries http learn adafruit com minty boost Page 72 of 99 GND GND All these parts must fit into the space left over from the battery pack make E
11. There is no need to clip http learn adafruit com minty boost Page 33 of 99 Adafruit Industries Next is the power inductor L1 This component is used by the DC DC converter chip to store and convert power from low voltages to high Inductors are just a coil of wire so they have no polarity and can be placed either Way The inductor may not sit perfectly flat since the socket is in the way a bit That s ok just lean it over a little Solder in both wires and clip them short http learn adafruit com minty boost Page 34 of 99 Adafruit Industries Next are the two electrolytic capacitors These help smooth both the input and output voltages to keep them stable during the up conversion They are used for low frequency noise and are often paired with a ceramic capacitor Electrolytic capacitors are polarized and must be placed correctly or the circuit will not work The longer lead is the positive one and must go into the pad marked with a as shown http learn adafruit com minty boost Page 35 of 99 Solder in the two capacitors then clip the wires Next solder in the 2xAA battery holder The red wire goes to the hole marked and the black wire goes to the hole marked Make sure you have them in right or you can damage the circuit Adafruit Industries http learn adafruit com minty boost Page 36 of 99 Solder in the wires if they re a little long you can clip them
12. Tunejuice charger to keep the iPhone from gobbling up the batteries So we took apart the charger Adafruit Industries http learn adafruit com minty boost Page 94 of 99 And found the following We substituted the closest 1 resistor values E Si 2 l 5 cr Cr o 2 DIT CO 2 D E a D 4 GND GMO T z GNO This time both voltages on the data lines are 49 9K 49 9K 75K 5 0V 2 0V We did some experimenting see the video up top and determined that in fact the different voltages resistances did effect the charging rates Using the 2 8V amp 2 0V setup resulted ina 1 Amp charge rate and the 2 0V amp 2 0V setup resulted in a 500mA charge rate This made us very happy because 500mMA is within the capability of the MintyBoost chip We redesigned the PCB to allow us to have 4 resistors on the datalines and put two 75K and two 49 9K resistors in each kit So far we have had no problems charging any of the latest Apple devices Hooray Adafruit Industries http learn adafruit com minty boost Page 95 of 99 Dd adafruit learning system Change Log What s changed A long history of boosting The mintyboost is one of our oldest projects and has evolved to work with more and more products Here are the differences between the many versions V1 0 June 2006 first release Schematic is essentially the same as the v1 1 but without R4 and R5 Documented in the process page this kit used the MAX756 boost chip f
13. are interested in learning how to start selling their own kits This project was developed under support from EYEBEAM http adafru it c36 thanks Adafruit Industries http learn adaf ruit com minty boost Page 7 of 99 This website and all original content therein is published under the Creative Commons http adafru it c37 2 5 attribution license Reviews amp Gallery Read what some people have to say And let me know if you have a review you d like linked to from here e Paul Stamatiou s review http adafru it c38 e Jim Wandering s review http adafru it c39 e Daniel Beck s review http adafru it c3a e Ryan Pauley s philosophical review http adafru it c3b e The Samurai s gallery http adafru it c3c e Erike built one for his sweetheart http adafru it c3d e Bean tooth made a cherry flavored one http adafru it c3e e Piet in Finland uses his for watching long videos http adafru it c3f e Lexiredlion built 5 http adafru it c3g Device Compatibility Hey we moved this really long list to the user manual please go there to see compatibility charts for versions 2 and 3 of the mintyboost http adafru it c 3h Mintyboost is a registered trademark of Adafruit Industries Adafruit Industries http learn adafruit com minty boost Page 8 of 99 Dd adafruit learning system F A Q Frequently Asked Questions It works But then the iPod iPhone device gets drained what s up T
14. bigger batteries The other option is to add more batteries in series You can definately go with three NiMH cells which will boost power by 1 3 and as long as you are using NiMH NiCad rechargable you can also try 4 AAs Because NiMH cells do not run at 1 5v they run at 1 2v or so four cells will be under 5 volts Of course do not use 5 or 6 AA s as that will go well over the 5 volt limit Lithium lon Polymer If you are an advanced electronics geek and want an ultra light rechargable mintyboost you may be thinking about going with a lipoly or liion battery The Mintyboost works great with these but be sure to watch for the following 1 Use only single lithium ion polymer cells 3 7 to 4 2v Don t use 7 2v 8 4v cells those are way too big 2 Use only lithium ion poly cell with a protection circuit The mintyboost draws a lot of current and will drain the battery all the way down unprotected raw cells will almost certainly be damaged either bursting catching on fire leaking fluid etc Really we mean it 3 Use only a proper recharger for the cells lithium ion poly s are delicate and cannot be charged in a NiMH charge Adafruit Industries http learn adafruit com minty boost Page 50 of 99 4 Do not parallel lithium polymer cells on your own Power packs come with a balancer circuit that must be used to keep them from discharging into each other Basically don t start noodling around trying to invent your own lithium
15. if you want 100mA at 5V basically USB power then you re taking LOOmA at 9V and then losing the 4V 100mA 400mW 4W difference as heat As the battery wears down to 7V the heat loss goes down to 7 5V 100mA 2W but you re still getting bad efficiency At best the efficiency is 72 5V 7V and at worst it s 55 5V 9V Adafruit Industries http learn adafruit com minty boost Page 63 of 99 That means you re losing about a third of the battery power to heat I ll also throw out that the 7805 itself has a quiescent current of about 5mA so you re always losing 5 5mA 100mA efficiency just for regulation amp that s at least since if you re trickle charging the battery at 50mA then the 5mA quiescent is 10 OK so basically the 7805 9V solution works but the efficiency ts startlingly low say 60 or so and provides only 300mAh at 5V We can engineer better Engineering better From experience know that AA s are great They are cheap have lots of power very low internal resistance and are easily available everywhere Whereas a 9V has 500mAh for a total of 9 500 4 5Wh power two AA s have 3000mAh each for a total of 2 1 5V 3000mAh 9Wh about twice as much power The only problem is that 2xAA s provide 3V and what we need is 5V With a 9V battery we can use a linear regulator because 5V lt 9V but sadly we cant use a linear regulator to turn 3V into 5V Instead we will need to use a boost regulator also known as a DC
16. isn t 5V anymore At this point the batteries are toast and you won t be able to squeeze any more power out of them However some phones and mp3 players especially ones that start with an are not very smart and even if there is no more power coming out of the charger they stay on which means they slowly drain back down Basically the best way to avoid this is to not leave the mintyboost plugged in overnight Just charge for a few hours or while you re using it For Apple products you can also use the charging icon as a hint while the Mintyboost is still 7 57 Friday July 30 working you ll see this icon G 43 ap When it s done you ll see a plug icon the device may also beep or buzz when this happens At this point you should unplug the mintyboost and get new batteries for it Adafruit Industries http learn adafruit com minty boost Page 47 of 99 Dd adafruit learning system Batteries User manual Choosing batteries Batteries The most important part of using your Mintyboost Is choosing and installing the right batteries Poor quality batteries will cause frustration and using the wrong kinds can damage your kit Please read this guide which will cover all the kinds of batteries you can use How the mintyboost works The mintyboost is a voltage source which means it tries its hardest to make sure the output Is at 5 volts no matter what the current draw by the target device is The device you ar
17. lot of information use but it s difficult to express it tend to decide whether want to sell something based on how popular useful easy it is think that this kit will be pretty popular and useful because lots of people have stuff that charges powers over USB Also it seems like other people are selling similar things like the 9V 7805 type charger or Griffin s 9V charger http adafru it c4g or Belkin s 4xAA charger http adafru it c4h It s easy to make because all the parts are through hole and there s not a lot of them I m going to basically assume I ll sell 200 or So within a few months and I ll order parts in batches of 100 so should budget that way I often buy more than 100 PCBs at a time because of the scale economies involved in PCB manufacture as show later It turns out so Adafruit Industries http learn adafruit com minty boost Page 82 of 99 far that can sell a couple hundred units of a kit in a few months particularly if it gets picked up by a blog or web site This may or may not be true for you however if you can t afford to make 25 kits at once you re going to find that it s hard to make any money in the process To figure out how much to charge make up a table with different quantity prices Part Price 1 Price 50 Price 100 Boost chip MAX756 4 62 2 9 2 32 2 x Q0 1uF caps 0 10 0 10 0 10 1n5818 diode 0 09 0 09 0 08 2 x 100uF caps 0 12 0 10 0 10 18R223 inductor 1 42 1 3
18. polymer cell pack How many recharges will I get This completely depends on what kind of batteries are in the mintyboost and what kind of battery is in your device Both are energy buckets but the size of the buckets will tell you if you can fill one with the other There are few things that make a difference e The first thing to keep in mind is that the Mintyboost converts power from low voltage to high voltage 5V but it is not perfect there is charging efficiency loss The conversion efficiency can be approximated as 80 it may be higher or lower but it s pretty close e The device battery capacity is mAh The mWh is not useful here because the charger inside is linear If your gadget has a 1000 mAh battery inside that tells you the size of the bucket you are trying to fill e The mintyboost battery capacity For fairly good batteries this is going to be about 2800 mAh e The fact that the most AA batteries you get have their capacity specified for low drain use and this is high drain use For alkalines you can probably consider the capacity to really only be 75 of what they say it is For NiMH maybe 80 and for Lithium Polymer it s 100 they are really good at this sort of thing e The mintyboost battery voltage For alkalines this is 1 5 for NiMH its going to be less 1 2V Let s say we are using Duracell 1 5V Alkaline AA s First figure out what the milliWatt hours of the mintyboost power supply is mintyboost
19. re ready to put it in the case Go buy a tin of Altoid gum and eat them or give them to your friends think they re disgusting so don t send them to me Note that Altoids has discontinued the gum However we did manage to find a source of gum sized tins and we have them in the store see the link to the right You ll need the MintyBoost kit an empty gum tin a pair of tinsnips and two pieces of doublesided foam sticky tape the tape is included in the kit Cut two notches in the end of the tin just about where the flat part ends and the tin starts to round out Adafruit Industries http learn adaf ruit com minty boost Page 41 of 99 Now you want to bend the flap back and forth to break it off if you re careful you can bend it in more than out which will make it round into the tin one less sharp edge Adafruit Industries http learn adafruit com minty boost Page 42 of 99 Adafruit Industries Try atest fit Slide the board in first then fit the battery pack in Don t put the batteries in for this test The circuit board could short against the tin and destroy the circuit Once you re happy remove the electronics and put the doublesided sticky foamtape on both the circuit board and the battery holder Remember to make sure no pin or parts or leads are sticking out and can touch the tin Use duct foam or electrical tape to protect the circuit Clip your leads short so they dont poke t
20. to the Data pins they are left to float Now technically USB ports can provide up to 500mA of current output and technically every device is Supposed to perform a basic data transfer to the computer called enumeration where it says hey I m about to drag 500mA out of the computer just so you know and the computer can say go ahead or no can do this is called the power negotiation However we ve found that every device that does not require to do any data transfer Say USB fans or USB battery chargers don t bother to warn the computer and just go ahead and grab up to or even more than 500mA from the USB port As long as they aren t going thru an unpowered hub this seems to be just fine All computers have a resettable fuse on the USB port so that if more than 1000mA is drawn the power will be disconnected This protects against short circuits in your 5 USB fan that would take down the entire computer iCharge Knowing the above we designed the first Mintyboost to not have anything on the data lines we assumed that nearly every charger and device would just ignore those pins as they tend not to be used For example in the CAD file of the first Mintyboost the USB connector is the top square The four ovalish pins in row as the USB wires Pin 1 and 4 are used for power blue lines are connected but there are no traces onthe middle two data pins they are floating Adafruit Industries http learn adafruit co
21. worried lick your finger a little and touch the tip of your finger to the top of the LT 1302 chip If you don t hear a sizzle of the water boiling away it s just fine However if the batteries are so hot that its painful to touch start to smoke burn or melt or leak fluid something is wrong Unplug it immediately and remove the batteries if it is safe to do so But it s really hot and I m worried Adafruit Industries http learn adafruit com minty boost Page 10 of 99 Yes this is normal When the chip is working to charge your gadget it s going to get hot Normally you never get to see or touch the chips in your chargers so you dontt realize how hot electronics get Really it s normal for the Mintyboost to get hot If you re concerned you can always do the finger test above If it s too hot it will sizzle otherwise it s OK When I plug in a device sometimes theres a hum hiss squeak whine etc noise is this normal Yes sometimes the inductor resonates with the boost converter and that resonance leaks into the audible range While it s not good for it to always vibrate it does happen occasionally and is not harmful to the charging device you can try moving the inductor a little with your finger but the noise is electrical in nature so it s hard to stop completely Another thing is that it depends on how much power the device is drawing and what kind of batteries are inside If this is a char
22. 00 mAh 1500 mAh Tested v3 no need to short data lines Would claim to charge with standard build but had to short data lines for it to work CM10 ROM Tested v3 Notes V3 detected as PC also after blobbing together the middle USB pins Charging Shown on screen only when phone Switched to PC flash storage offline mode But after 3 hours no change in battery status 2X2300 NIMH AA used 1 32V on each also after 3 hours Notes Modified a v2 kit to V3 now charges fine v3 kit data terminals not shorted http learn adafruit com minty boost Page 57 of 99 Product name Results Blackberry Storm in progress BlackBerry Tour 9630 Works Battery Size Notes 2300 mAh BlackBerry Bold 9900 Does Not Work 1230 mAh More Phones Product name ZTE BLADE aka orange mobistar San Francisco eBook Readers Product name Results Kindle Works Kindle DX Works B amp N Nook IstEd Doesn t work B amp N Nook should Handheld Games Product name Results PSP Slim 2000 3000 Works PSP 1000 Works NDS Lite Works Results Works Battery Size 1500mAh 1500mAh 1530mAh 1500mAh Battery Size 1200mAh 1800mAh 1600mAh needs 2 volts need to modify MB 2 0 to 3 0 specs Standard build Shorting the data lines may show as charging but this does not seem to be the case Battery Size Notes 1250 mAh 4 7Wh Standard build Notes Orange have power light turns on but charging ind
23. 000mA or higher is good as well Larger capacity batteries also have a positive side effect that they dont droop orsag as much under high loads and have lower internal resistance Tons of info Adafruit Industries http learn adafruit com minty boost Page 52 of 99 e Sanyo NIMH and Eneloop capacity info http adafru it c3D Adafruit Industries http learn adafruit com minty boost Page 53 of 99 De adafruit learning system Compat v3 Device Compatibility list for v3 Verison 3 mintyboosts This compatibility list is for the version 3 0 of the mintyboost which uses the LT 1302 charger chip and has 4 resistors for improved iPhone compatibility Basically If you got it after August 2010 it s probably v3 but check the kit packaging to be sure The following tables contain the current known tested devices and results We are pretty sure that every device that worked with the MintyBoost v2 http adafru it c3B will work with the v3 in addition to all the Apple devices However we don t own every gadget in the world that would be neat but expensive so if you find a device that works please let us know by contacting us http adafru it c30 posting in the forums http adafru it forums or sending Feedback Thank you Apple Products Product name Results Battery Size iPhone 5 5s and 5c Works IPhone 4s Works iPhone 4 Works 1400mAh iPhone 3Gs Works with most 1200mAh iPhone 3G Works 1200mAh iPhone Works 1400mAh i
24. 2uH inductor with a 1 2A saturation limit and DC resistance of 0 02 ohms What we want is through hole which actually means it s going to be hard to find an inductor almost all inductors are surface mount But I ll take a look at what digikey has to offer I search for fixed uH inductor smd smt which means don t want SMT SMD surface mount and want a non adjustable inductor that is in the uH range not MH or nH then filter out inductors with 1 3A current and 18 27uH inductance Adafruit Industries http learn adafruit com minty boost Page 71 of 99 Keywords fixed uH inductor smt smd Items in Stock Lead Free RoHS Compliant Advanced fixed 24216 uH 23254 inductor 24513 Excluding smt 97744 Excluding smd 156620 Records matching criteria 2238 inductors Ceils Chekes Fed Current Induc Package Case Packaging Series Axial Bulk B82422A PCB Mount Cut Tape CT B82422H Radial Tape amp Reel TR B82422T Radial Horizontal Mount B82432C Radial Vertical Mount B82432T Through Hole B82442A 25mm x 2mm x 1 8mm B82442H Gmm x Emm x 2 8mm CM1011 6 3mm x 6mm x 2 5mm v CM3900 v 3 1A That filters it down to about a dozen choices The SLF inductor is actually surface mount and we re going to outright ignore the ones that cost more than 2 50 Inductors for small electronics like this should cost around 1 2 as a guideline That leaves us with the DN7418 ND INDUCTOR 27UH
25. 5 1 29 USB jack 0 52 0 35 0 32 AA holder 0 59 0 53 0 49 PCB 12 50 7 25 3 75 PCB tooling N A 3 1 5 Antistatic Bag N A 0 12 0 12 Sticky tape squares N A 0 10 0 10 Total 19 90 15 75 10 10 To calculate the PCB costs used Advanced Circuit s http adafru it c4i insta quote service Production Price Matrix Unit Price To Flace Order Cik on unit pice below Production Board Specs Gold Fingers Hone Courter Ske Ha Conia Bones Ho CHC Route peas 10 TabRoute No Pitch 0 06 Soddermask frill enig Ho iaca vahis space oo Soideimack Color r Pitted Edges Ho Smalle hobs size 0024 Legend Top ee Plsted Slots No Legend Cole Black Tolerances repected lo PC 4 E00G Clare 2 Adafruit Industries http learn adafruit com minty boost Page 83 of 99 These prices are for 2 PCBs which I ll cut in two because it s cheaper probably because they don t like dealing with very small circuit boards usually go with 2 week turn prices Note that the PCB quote doesn t include the 150 one time tooling NRE fee which adds 3 to the 50 price and 1 50 to the 100 price Advanced Circuits is a little expensive but they re very good on quality and they re good at catching mistakes Anyways you can try going with a cheaper Shop but I can only vouch for these guys There s also shipping prices included maybe 1 per In general double the parts cost to come up with the retail
26. 99 Looks like have about 1 25 x 0 7 semicircular PCB space at the top for the circuit board also try out another battery holder have this gives me more space 1 25 x0 85 but the batteries go in sideways so one would have to remove the holder to change the batteries I d prefer that you can just take them out directly so don t go with this one it also turns out don t need that extra space now do a little hack to turn the PCB mount 2xAA battery holder into a wire lead one Like this product photo for HOLDER BATTERY 2CELL AA 6 LEAD from Digikey Adafruit Industries http learn adafruit com minty boost Page 67 of 99 Basically just solder on red and black 6 wires and clip off the PCB through hole leads This is actually a little difficult because the plastic melts and you have to sort of keep it in place while you solder Its not suggested Adafruit Industries http learn adafruit com minty boost Page 68 of 99 OK looks good Adafruit Industries http learn adafruit com minty boost Page 69 of 99 a B Now that s done I m ready to think about what can cram into that space Basic Boost So now it s time to design the boost supply Since don t have much space I m going to try to make my circuit as tiny as possible but still be easy to solder That means want a boost chip that is 8 DIP Smallest though hole with an internal MOSFET switch 1 less part and is high frequency
27. Jason Streigel s 9V 7805 USB battery http adafru it c4a hackaday e lans Firewire switching charger http adafru it c4b Instructables http adafru it c4b e Chris DiClerico s 9V AA s firewire charger http adafru it c4c OK there s probably even some I m missing So what s the overarching theme here Almost all use 9V batteries and a 7805 an extremely common linear 5V regulator makes a solid 5V from 7 18V input This design works great because well 7805 s are awesome and 9V s provide 7 9V depending upon how dead they are However there s one thing about 9V s that I ve learned from lots of bad experiences One is that they don t have a lot of amp hours that is how much current amps they can provide and for how long hours A duracell 9V provides about 500mAh over its lifetime That s 500 mA or 5A for one hour or 100mA for 5 hours That number is somewhat idealized but it s a good Starting point Another problem is that they don t like to supply a lot of current because they have high internal resistance 2ohms but basically that just means that if you want a lot of current say to resuscitate a drained device the 9V wont provide all 500mAh but maybe more like 400 Say you re drawing 250mA then 25A 2ohm 0 5V lost to internal resistance For more info on 9V read the duracell datasheet http adafru it c4d Another problem with the 9V 7805 scheme is that a 7805 is a linear regulator That means
28. Mod Works Works Works Works with Mod 950mAh 900 mAh 3 4Wh Battery Size 1930 mAh 1150 mAh Will light up and claim to be charging but won t actually charge with or without the data lines shorted Short the two data lines together and it seems to recognize it as charger After 20 minutes percent charged increased but by morning both phone and MB3 batteries were dead Standard build Standard build Notes V3 tested only Some reports excessive Current draw and overloading the MintyBoost as well as other chargers Short the two data lines together see last image of instructions May need to remove R2 and R4 Non removable Li lon 3300 mAh V3 tested only 1500mAh min 1540mAh typ Results Battery Size Works 1500 mAh Adafruit Industries 5 6 Wh min 5 7 Wh typ Requires LiPo Lilon or 3 AA battery input Notes http learn adafruit com minty boost Page 56 of 99 Vibrant Works Moment Works Galaxy S2 16GB GT 19100 Works Galaxy S3 Works Galaxy S3 1 47 AT amp T Works Samsung Galaxy 17500 Works Samsung Galaxy Nexus Works Sony Ericsson Product name W580 Xperia Arc Xperia Ray Nokia Product name N97 lumia 820 RIM Adafruit Industries Results Does not work Works Works Results Battery Size Works 1200mAh Works 1650mAh 1500 mAh 1650 mAh 7 98 wH 3 8 V Lilon 1440 mAh 1850 mAh Battery Size 930mAh 15
29. Pick one up here http adafru it 291 http learn adafruit com minty boost Page 16 of 99 ve adafruit learning system Parts list Check your kit Check to make sure your kit comes with the following parts Sometimes we make mistakes so double check everything and email support adafruit com if you need replacements Note that the parts list is slightly different depending on whether it is the latest v3 0 kit older v2 0 or ancient v1 2 kit Check the kit packaging to determine which version you have If you have an older version scroll down to find your parts list Also note that Altoids has discontinued their gum We have identically sized tins in the store now http adafru it 16 Parts list for v3 0 Image Name Description 5V boost converter Ren LT1302CN8 5 for v2 0 and V3 0 IC1 8 pin socket Power supply capacitor C4 C3 220uF 6 3V Adafruit Industries http learn adafruit com minty boost Distributor Qty Newark 1 Linear Generic 1 Generic 2 Page 17 of 99 Ceramic C1 C2 Bypass capacitor O 1uF Capacitor 1 8W 5 3 3K resistor Orange Orange Red Gold This part was added in R5 version 3 0 If you Generic 1 don t have one you may have a version 2 0 kit 1 8W 1 75K resistor Violet Green Black Red Brown This part may also appear as a Brown body 7502F DALE resistor 2 This part was added in version 3 0 If you don t have one you may have a version 2 0 kit
30. Pod Video 5G Works 450 850mAh iPod Nano 3G Works iPod Nano 5G Works 220mAh iPod Nano multi touch Works iPod Touch 3G Works Adafruit Industries http learn adafruit com minty boost Page 54 of 99 IPod Touch 4G iPad HTC Product name T Mobile G1 Google Dev Phone 1 HTC Dream HTC Droid Eris HTC Legend HTC Magic HTC One S HTC Desire A8183 HTC Evo HTC Droid Incredible T Mobile G2 HTC Vision HTC Desire Z HTC Hero GSM T Mobile MyTouch 4G HTC Thunderbolt 4G Verizon HTC Velocity 4G Telstra LG Product name Results LG Ally Works Adafruit Industries Works Doesn t work Results Battery Size Works 1150 mAh Works Works with v2 1300mAh Works V3 0 Works V3 0 Works 1400mAh Works 1500mAh Works V3 0 Works 1500mAh Works 1350 mAh Works 1400 mAh idee 1400 mAh wore 2 Sanyo M Battery Size Notes 1500mAh http learn adafruit com minty boost 6800mAh Notes Detects as USB Charger Trickle charger 600 mA charging with 3 NiMH cells Will light up and claim to be charging but won t actually charge without the data lines shorted Page 55 of 99 LG CF360 LG Nexus 4 LG Optimus S LG Env3 Verizon LG GD510POP Motorola Product name Atrix Backflip DROID DROID RAZR MAXX DROID X Milestone Samsung Product name Captivate Works Does not work Does not work 1500mAh Works Works Results Works Works with
31. UMETRIC ENERGY DENSITY ENERGY DENSITY wile 2 1 MNI15 viv 515 8 8 AHE LiL ERP a silk 8 O 0 SV per cell at 21 C 70 F ased on 1 2 volt average operating voltage per cell at 21 C 70 F Table 1 Comparison of typical energy densities of major DURACELL alkaline cells batteries s ly w 4 2 JE For example upgrading a set of Duracell AA s 2850 mAh to C 7800 mAh or D cells 15000 mAh will increase the capacity 3x C or 5 5x D If you want even MORE power you can add a third battery in series to increase the input voltage from 3 volts 2 x 1 5v to 4 5 volts Three AA Alkaline batteries has approximately 1 3x more power than 2 Alkaline AA s three C s have 4x as much capacity as two AA s and three D s have 7 5x more capacity br However there is a limit to how many more batteries you can add For example after 3 Alkalines one would think you should go for 4 But 4 Alkalines is 6V nominal and actually may be as high as 7V since this is higher than the 5V output it is not safe or good for the mintyboost or your device For that reason use only 2 or 3 alkaline batteries not 4 OK now what about rechargable AA s First thing to remember is that rechargables C or D cells may not have more capacity Sometimes they are really AA batteries ina large plastic shell Assuming that you can get real rechargable C or Dcells you should be able to get 3x or 5x more capacity just by going with
32. agleCAD library parts for the inductor and chip the rest are already there and lay out the board I m not going to detail making library parts in eagle or pcb layout others have done so already Use whichever software you want like Eagle because there s a free version available for download if you re just making small PCBs Since lam know this is just a prototype version make the PCB single sided for easy etching also make the traces really large print out a paper version of the PCB and punch the parts through to verify that they re the right shape package Adafruit Industries http learn adafruit com minty boost Page 73 of 99 get my etching setup together turn on the heater for the etching tank and print out a bunch of tiled PCB layouts on toner transfer transfer the toner onto a single sided PCB and etch it in the tank Adafruit Industries http learn adafruit com minty boost Page 74 of 99 Then I clean off the toner transfer drill the holes with a dremel drill press with carbide drill bits and cut out the shape Adafruit Industries http learn adafruit com minty boost Page 75 of 99 Then I solder the parts in and fit it into the case with the battery pack using double sided foam sticky tape to hold down both the battery holder and the PCB without shorting the PCB to the metal tin Adafruit Industries http learn adafruit com minty boost Page 76 of 99 Adafruit In
33. an I convert a v1 x kit to a v2 x Can use a MAX756 in a v2 x ora LT1302 5 in a v1 x 11 Why doesn t the v1 2 kit come with R1 R3 and LED1 11 Adafruit Industries http learn adafruit com minty boost Page 2 of 99 I m trying to make breadboard this kit on my own and it s not working HELP ME 11 Do you have any high rez photos 12 Make it 13 Make your own 13 Make it 13 Older soldering instructions 13 Preparation 14 Tools 14 Parts list 17 Check your kit 17 Parts list for v3 0 17 Schematic for v3 0 19 Parts list for v2 0 20 Schematic for v2 0 22 Parts list for v1 2 22 Schematic for v1 2 24 solder it 26 Instructions for Version 3 0 26 solder It 26 Case it 41 Use it A5 Tips and tricks how to use your MintyBoost 45 The MintyBoost User manual 45 How to use 46 Basic User Manual 46 Go MintyBoost 46 Compatibility 46 Which batteries to use 46 How to charge 46 While charging 46 When to stop charging 47 Batteries 48 Adafruit Industries http learn adafruit com minty boost Page 3 of 99 User manual Choosing batteries Batteries How the mintyboost works Standard AA s Rechargable AA s Alkaline or rechargable Bigger batteries More batteries Lithium lon Polymer How many recharges will get Detailed guidelines Voltage Requirements Detailed guidlines Current Requirements Tons of info Compat v3 Device Compatibility list for v3 Verison 3 mintyboosts Apple Products HTC LG Motor
34. arly all Nokia phones except the 8600 also known as standard Nokia USB data charger cables O2 XDA Il http adafru it 22 Openmoko neo FreeRunner see here http adafru it c3H Palm TX Palm Tungsten T3 Palm Zire 71 and 72 Palm Pre PocketPC HX4700 Go into the power settings and turn on charging through USB Rio Carbon Samsung SCH 1730 SGH 1750 SGH 1858 With a USB charger cable http adafru it c3l you can also hack a cable yourself see here http adafru it c3 SCH U520 Samsung T809 Sandisk Sansa Express use pullup resistor See notes here http adafru it c 3K Sony PSP with adaptor cable http adafru it 23 Treo 700p 750 using Palm s charge sync cable T Mobile Dash HTC Excalibur T Mobile Wing or HTC Herald or HTC P4350 T Mobile G1 google phone Tested Kinda Works Motorola RAZR v3 doesn t work by default requires a bit of cable hacking See this document at pinouts ru http adafru it c3L and this fellow s graphic http adafru it c3M Treo 600 Says it isnt but is Won t charge more than 50 Samsung DOO phone Should also work D800 D820 E780 E870 P300 P910 P920 T809 Z540 requires a cable hack http adafru it c3N Motorola H700 bluetooth headset Kinda Sorta Unclear BT GPS1210 SIRF Ill mouse requires USB charging cable Tested Doesn t work Audiovox SMT 5600 Window Mobile phone v1 2 works with the 6700 so it could be that this works now 1 3G iPods Firewire o
35. ase post on the forum or contact us thanks Nearly all USB charging devices and any device that charges with 5V power up to 500mA with v2 or v3 of the kit can be used If you are having problems with your device see the other FAQ s below ARRGH It doesn t work Don t panic Post to the forum http adafru it forums don t send email about your problem A high resolution photo of the top and bottom of your kit will be extremely helpful in debugging your problem get the right voltages but it doesn t charge my favorite gadget Is the kit a USB Specification Charger If not how can I make it into one Some devices will only charge from dedicated USB spec charger You may want to convert your Mintyboost to a USB spec charger which is very simple to do follow the instructions here Adafruit Industries http learn adafruit com minty boost Page 9 of 99 on how to do it http adafru it c3j This mod will work on any MintyBoost version v1 v2 or v3 Then try again Can I buy a pre made pre built MintyBoost We don t sell assembled MintyBoosts only kits http adafru it aK1 However if you post on the forum people sometimes offer to sell manufactured kits at low cost What does the MintyBoost kit come with The kit comes with a PCB and all components necessary to build the kit It does not come with an altoids tin or tools or batteries The tin isn t necessary but MintyBoost Is designed to be placed in one for
36. atteries and finish assembling the kit Next is the USB type A connector This is the connector that is on a computer and nearly all USB charging cables will plug into it The Connector should snap easily in place Adafruit Industries http learn adafruit com minty boost Page 38 of 99 The two large side connectors are used for mechanical strength They keep the connector attached solidly to the PCB so make sure to use lots of solder or it will break off from use The four middle pins carry the power and data for USB Solder in all four Now is a good time to test your kit before you put it in the case Check that it charges your favorite gadget and perhaps wait a few minutes to make sure that the battery meter inches up If you are having trouble getting the device to recognize the Mintyboost as a charger it could be because it only wants USB spec chargers This is easy to do with the Mintyboost and always worth a Shot as it will get most stuff up and running Remove the batteries from your kit Then using your soldering iron heat up the two middle USB pins at the same time and blob on a bunch of solder to Adafruit Industries http learn adafruit com minty boost Page 39 of 99 Short them together Now try again Mintyboost is a registered trademark of Adafruit Industries Adafruit Industries http learn adafruit com minty boost Page 40 of 99 Ye adafruit learning system Case it OK now you
37. blem Adafruit Industries http learn adafruit com minty boost Page 92 of 99 Using 100K pullups on the data lines worked pretty good and all was happy Then the iPhone 3Gs came out and Charging is not supported Apple stopped being as lax with the charging interface and started being very picky about having the official chargers We still doubted that there was an enumeration chip inside each charger too expensive and complex So there must be something e se going on in those data lines Time to sacrifice an official Apple iPhone 3Gs charger Adafruit Industries http learn adafruit com minty boost Page 93 of 99 Taking it apart desoldering the 4 data line resistors and measuring them on our multimeter we found the following as shown in the schematic AF I E 4 r i The four resistors create a voltage at each of the data lines that s not 3 3V but rather 2 8 and 2 0 or so volts The problem is that when you do this the iPhone starts to draw as much as LAmp Way more than the LT1302 and a couple AA s can provide We were a bit sad and thought that there was no way to get the Mintyboost working with an iPhone when we took at trip to J amp R and found an item called the TuneJuice The Tunejuice is an iPhone charger that uses 4 AAA batteries This is very interesting because there is no way to get an Amp out of AAA s they are just way too small That means there must be something ELSE going on in that
38. can generate Gerbers or extract a postscript image for toner transfer easily using EagleCAD http adafru it c3Y freely available for Mac Win Linux e Prototype schematic http adafru it cn4 and board http adafru it cn5 files Here are the final files for the kit They use a radial inductor and have pads for a low battery indicator SMT LED It s doublesided but there s only one trace to jumper if you re not using the low battery indicator e V1 0 schematic http adafru it cn6 and board http adafru it cn7 files then did a minor upgrade to add a pullup and pulldown for better performance e V1 1 schematic http adafru it cn8 and board http adafru it cn9 files All of these files are available under the Creative Commons http adafru it c37 2 5 attribution license Datasheets e LT1302 http adafru it c3U page e MAX756 http adafru it c3T datasheet e AA NiMH http adafru it c45 datasheet Adafruit Industries Last Updated 2014 03 16 12 31 23 AM EDT Page 99 of 99
39. dustries http learn adafruit com minty boost Page 77 of 99 Done Testing the prototype Now we test to see if it works With the two batteries inside measure the voltage on the USB connector about 5V which is good I send off this version to a friend with once of each kind of iPod including the newest 4G video iPod for real world testing Both to verify the iPod will charge and also how long it will run with the additional pack Adafruit Industries http learn adafruit com minty boost Page 78 of 99 Numbers as soonas the QA dept gets them back to me Verifying the math So intheory we should be able to calculate the efficiency of the boost converter from datasheet info We re basically boosting 2 5 3VDC gt 5VDC at around 50mA 100mA Looking at the MAX756 datasheet this is the efficiency graph EFFICIENCY vs LOAD CURRENT SV OUTPUT MODE g0 TEER o UERN WON AM a tL ACEC o H 40 10 100 10 0 1 So we should be getting around 85 efficiency perhaps a little more think the only thing that MAXUS EFFICIENCY 2 00 LOAD CURRENT mA Adafruit Industries http learn adafruit com minty boost Page 79 of 99 can really change this number a bit is the inductor Below verify I m getting 82 efficiency If we re getting 82 efficiency conversion from 2 x 3000mAh Duracells that means we get 2 1 5V 3000mAh 83 7 38 Watt hours Compare that to a single 9V as we ca
40. e charging mp3 player etc is a resistive load That means it basically sucks as much power as it wants out of the mintyboost The device you are charging is almost certainly very stupid it doesn t know or care that you are trying to use AA batteries to recharge it Most devices assume that you are plugged into the wall or into a computer which is plugged into the wall and suck as much power as possible to quickly charge up so you can listen to music or make phone calls This of course is a bit of a tradeoff The higher the current draw the harder the mintyboost has to work and the AA s have to work They ll get hot they lose efficiency the batteries drain and droop There is no way for the mintyboost itself to fix this it is completely up to the phone or music player For that reason we need to have good batteries that will be able to work well while being drained fast Standard AA s We suggest using two AA batteries to run the Mintyboost that s why we include a 2xAA holder in the kit AA batteries are common and inexpensive and provide a good amount of voltage and current See below for detailed information about voltage and current guidelines However not all batteries are made the same Picking the right kinds of batteries will give you the best results In approximate order of effectiveness here are the non rechargable batteries you will want to use Lithium 1 5V high drain AA batteries 2900 mAh High
41. est performance Alkaline or rechargable Which is better Well that s a question that depends a lot on the battery quality In general we always suggest rechargables as they are less wasteful and are not much more expensive However sometimes you re in a bind or need the light weight of Lithium AA s Either type will do fine but try to stick to 1 thru 3 in the preferences above The tradeoffs are e Alkaline batteries are available eveywhere don t need to be charged before use can be less expensive e Alkaline batteries have a higher nominal voltage of 1 5V so they provide more power just because of the voltage increase e NiMH are very good at providing a lot of current often better than Alkalines although perhaps not as good as Lithium 1 5V cells e NiMH cells other than Eneloop and similar low self discharge will slowly run down even when just sitting around Because the run time completely depends on how the device charges what its battery size is etc nothing beats timing and testing the first time you use the Mintyboost to charge your device Adafruit Industries http learn adafruit com minty boost Page 49 of 99 Bigger batteries More batteries Let s say you want more power out of your mintyboost the best way to do this is to upgrade the batteries from AA to something beefier Lets start with alkalines Please refer to this Duracell alkaline battery capacity chart TYPICAL GRAVIMETRIC TYPICAL VOL
42. ficiency 83 80 70 62 Adafruit Industries http learn adafruit com minty boost Page 80 of 99 18R223 100mA 3Vin Vout 4 98 lout calc d 100mA lin 200mA Efficiency 83 100mA 2 5Vin 4 93 99mA 240mA 81 250 mA 3 Vin 4 83 242mA 480mA 82 250mA 2 5Vin 4 68 234mA 640MA 68 It looks like inductor 2 is little more efficient probably due to the fact it has a lower DC resistance 30 milliohms instead of 7Omohm of the other inductor It s also a bit cheaper so I ll go with that inductor Regardless it looks like the efficiency is around 82 which is about what expected Another thing to note is that don t put an on off switch in like you d need with a 9V 7805 regulator That s because the quiescent current of the MAX756 is very low on the order of LOOUA 0 1mMA measured this myself and got about 75uA Adafruit Industries http learn adafruit com minty boost Page 81 of 99 That means that the self discharge rate is 2000MmAh 0 1mA 20 000 hours more than 2 years Most batteries don t last that long Therefore we don t need a switch when nothing is plugged in almost no power Is being used Kit budgeting So now that I ve verified that the project works have to figure out whether want to sell it how many expect to sell and how much I want to charge Lots of people have different techniques for this I tend to go with my gut which usually means there s a
43. ger why are the data D and D lines used Why doesn t the 3Gs work with the Mintyboost v2 but the older iPhone does What are the pullup down resistors used for and which should use We have a full tutorial all about Apple gadget charging check it out http adafru it c3k Does the vl x work with iPhone iTouch Does the v2 0 Version 2 0 pretty much works with iPhones iTouch devices but the v1 0 cannot because it is not powerful enough To get it working you will need the LT1302 5 which can provide 500mA compared to 200mA from the MAX756 We have a full tutorial all about Apple gadget charging check it out http adafru it c3k Can I convert a vl x kit to a v2 x Can use a MAX756 in a v2 x or a LT1302 5 in a vl x No they are completely different designs requiring new PCBs are components they are not drop in replaceable at all Why doesn t the v1 2 kit come with R1 R3 and LED1 These parts are optional they are for the low battery indicator There wasn t enough space to add them to the PCB using through hole parts so they are surfacemount and on the bottom They re an extra capability which you may add if you feel experienced with SMT soldering I m trying to make breadboard this kit on my own and it s not working HELP ME It is pretty much impossible to get good ouput from the kit if it is breadboarded A custom PCB or proper perf board is essential Most components cannot be swapped and must be used as
44. his is acommon problem with iPods iPhone iTouch These devices have very large batteries and they have an annoying bug that if they think they re being charged they ll stay on and not go to sleep conserving power That means that if the AA batteries die before the device is done charging the device will stay on at full power because it thinks it is plugged into the wall This can cause it to drain the battery The best suggestion is to use fresh charged batteries and don t leave it plugged in overnight This is especially true of iPhones as they suck out all the battery power in a little less than an hour in order to quick charge This reduces the capacity of the batteries but means that your phone will be up and running faster Once you see the charging icon change from a plug the mintyboost is dead and you must unplug it For more information see the user manual http adafru it c3i How come my iPhone iTouch doesn t completely charge iPhone iTouch s have batteries that are so large there is no way to fully charge them on 2 AA s You can only charge 1 2 of a battery because the AA s will die before finishing You should use the Mintyboost to boost it but not as a way to fill the whole battery to full Will the MintyBoost charge my device Very likely Check out our compatibility lists for more information about your favvy gadget http adafru it c3h If you find a new device that it does doesn t work with ple
45. horized chargers http adafru it c3k v3 0 August 2010 a battery Ti dk _ Er GND 54 5 m J w o U 2 J Ce po D GNO J HK GNO 2 20UF P Lae gy n 5 GND l 5 ls M C Er lr O 1uUF GNO To improve compatibility with the latest smartphones and Apple devices the charging protocol Adafruit Industries http learn adafruit com minty boost Page 97 of 99 was reverse engineered so that the Mintyboost would be more universal The pullup down pins were also changed a full resistive divider which made it work with LiPoly batteries and Apple devices http adafru it c3k Still uses a LT1302 chip A 3 3K pulldown R5 was also added to turn off low power boost mode in the LT1302 chip this improved high drain handling at the risk of lower efficiency at low current draw However at this point almost all devices have large batteries gt 500mAh and require high charge rates Adafruit Industries http learn adafruit com minty boost Page 98 of 99 ve adafruit learning system Download Downloads v2 0 files e v2 0 Schematic in PNG http adafru it cn1 e v2 0 Schematic http adafru it cn2 and Board layout http adafru it cn3 files in EagleCAD format All of these files are available under the Creative Commons http adafru it c37 2 5 attribution license v1 0 v1 1 and v1 2 files You can use these files with the DN2474 inductor it s single sided so it s easy to etch at home You
46. hrough the foam You can easily destroy the circuit by being Sloppy here http learn adafruit com minty boost Page 43 of 99 You re done Remember that because the boost chip uses virtually no power you dont have to remove the batteries to turn off the MintyBoost Just plug and unplug devices whenever you want Here is a hack that was sent in by KRHAINOS for making the mintyboost more sturdy click to see the large version of the image 4c J Relic Shack MiSLIlag Yoo TIAE a nw 18 Mintyboost is a registered trademark of Adafruit Industries Enter a Title http adafru it cjt Adafruit Industries http learn adafruit com minty boost Page 44 of 99 adafruit learning system Use it Tips and tricks how to use your MintyBoost The MintyBoost User manual e How to use the Mintyboost http adafru it c3i e Batteries How to get the most out of your mintyboost from picking the right AA s to rechargables to mega capacity and more http adafru it c35 e Compatibility list for the latest v3 Mintyboosts http adafru it c3A e Compatibility list for older v2 x Mintyboosts http adafru it c3B e The mysteries of Apple iDevice charging revealed http adafru it c3k e Changes between versions of the Mintyboost http adafru it c3y Adafruit Industries http learn adafruit com minty boost Page 45 of 99 De adafruit learning system How to use Basic User Manual Go MintyBoost
47. icator does not and unit does not charge doesn t require USB spec for charging and worked with bare batts Notes Charge with the DC barrel connector not USB Charge with the DC barrel connector not USB Adafruit Industries http learn adafruit com minty boost Page 58 of 99 MP3 Player Product name Results Battery Size Notes Zune HD Works 660mAh Adafruit Industries http learn adaf ruit com minty boost Page 59 of 99 Dd adafruit learning system Compat v2 Device Compatibility for v2 x Mintyboosts For version 2 x only This compatibility list is for the v2 of the mintyboost which uses the LT1302 charger chip but does not have the special iPhoney resistors Basically if you got it before August 2010 it s definately v2 or earlier Mintyboost Compatibility chart Turns out some devices don t like being charged with a battery pack usually devices that require special drivers to charge Try plugging it into a random computer s USB port if you need to install software to get it to start charging you probably won t be successful Please post on the forum if you have more information on what works and doesn t Thanks Tested Works e Apple iPod Mini Nano rev 1G 2G 3G Shuffle 1G 2G Photo 5G Video Classic e Read Apple s identification guide http adafru it c3E to see which one you ve got if you re not sure e Older Apple iPod Touch v1 iPhone and iPhone 3G with v2 0 of the kit These do work b
48. inty boost Page 27 of 99 Now we will get rid of all that excess wire Use your diagonal nippers to clip the wire just above the end of the solder joint There should be almost no wire sticking out Next up we will solder in the 75K 1 resistors R2 and R4 These resistors are blue and have the following stripe colors Violet Green Black Red Brown They re very small and easy to confuse with the other blue resistors but the other resistors have white and yellow stripes so perhaps look and make sure your resistors don t have any light stripes on them You might also have brown 7502F DALE resistors that are a little larger in this case you can double the resistor over like this and solder it in the same Spot They wont sit flat but thats alright These resistors are used by Apple iPhones and such to determine what kind of charger is connected http adafru it c3k Adafruit Industries http learn adafruit com minty boost Page 28 of 99 Solder the resistors as you did the 3 3K one one point at a time checking your work TOO Aae gO ae N F dd D mo T ET MT AAGA Clip the long ends z A gt EP iv a a P ad MEK P 4 Dzn Ce ee Adafruit Industries http learn adafruit com minty boost Page 29 of 99 We will now finish up with the resistors grab the last two left these are 49 9K1 resistors and have Yellow White White Red Brown stripes They go into the slots
49. lculated before 1 x 9V 5 00mAh 65 2 93 Wh So we re going to get about 2 5x more power out of these two AAs than a single 9V With rechargeable batteries we get 2 1 25 2200mAh 81 4 45 Wh about 50 more than an alkaline 9V and 3x more than a rechargeable 9V Next lets verify the efficiency using test equipment and try out the different inductors to see if they make a difference Instead of using batteries I ll provide 3V from a bench supply that will also tell me how much current is being drawn And instead of an iPod I ll fake the load witha resistor Since the standard USB current draw is 100mA from 5V that means need a 5V 1A 50 ohm load can t just use a tiny resistor because 5V 1A 1 2W and most resistors are 1 4W So instead take two large 1000hm power resistors and twist them together also check the resistance to verify that together they are 50ohms also find a 200hm power resistor This will allow me to not only test a 100mA load but also a 250mA load perform 4 tests with 2 inductors 100mA load for both 2 5V in and 3V in rechargeable and disposable batteries and 250 load for both All the images are up on Flickr for viewing here is one example one inductor 1 DN2474 with 100mA load and 2 5Vin U Here are my results summarized DN2474 100OmA 3Vin 100mA 2 5Vin 250mA 3Vin 250mA 2 5Vin Vo ut 5 01 4 93 4 11 4 62 lout calc d 100mA 99mA 234mA 231mA lin 200mA 245mA 530mA 690MA Ef
50. m minty boost Page 89 of 99 When we first released the v1 0 of the MintyBoost oh so long ago http adafru it c3y we quickly got feedback from people who owned all sorts of Apple brand gadgets It turned out that older devices worked fine but some of the newer ones such as the iPod Mini were not charging Hmm Time to experiment First attempt We figured there was something simple that would make the Apple device charge and it definately had to do with the data lines the power lines are fixed at ground and 5V We thought is there a enumeration chip inside every charger but since that s expensive and kind of overkilly we decided instead to read up on the USB protocol go Jan http adafru it c3R In particular in her fantastic book there s a part about the low level signaling states Since you want to get the iPod charging but NOT make it try to enumerate we figured that we should see if there was some sort of special state you could put the data lines into that would say no computer is attached but there is power Turns out there is It s called the SEI and occurs when BOTH data lines are at 3V For mega details read this chapter http adafru it c3S Now to test We stole an iPod from a friend and cut open a cable so we could mess with the data lines We tried 3 options each connected to ground connected to 3V and not connected float At the same time we measured the current draw going thru the power line We found the
51. mWh Battery voltage V Battery capacity mAh Capacity derating 2 1 5V 2850mA 75 6400 mWh This is the battery s capacity Next we calculate the milliAmp hours the mintyboost will output at 5V Output mAh 5V Battery mWh mWh 5 V Boost Efficiency 6400 mWh 5V 80 1026 mAh output This how much current it can provide and for how long Now divide this by the size of the battery it s charging Say you are charging an iPhone 3G which has a 1200 mAh battery inside of full recharges MB output mAh Device Battery Capacity Adafruit Industries http learn adafruit com minty boost Page 51 of 99 1026mAh 1200mAh 0 85 times So at best two Alkalines can get you about 85 charged up not more than one charge Lets try again with Sanyo AA NiMH 2700mAh the best NiMH batteries there are MintyBoost MWh 2 1 2V 2700mAh 80 5184 mWh input Output mAh 5V 5184mWh 5 80 830 mAh output of iPhone 3G recharges 830 mAh 1200 mAh 0 70 These batteries will give you 70 charge up Less than Alkalines because the nominal voltage 1 2V is less than Alkaline 1 5V Finally lets do a 1200mAh lipoly battery with 3 7V nominal voltage MintyBoost MWh 3 7V 1200mAh 100 4440 mWh input Output mAh 5V 4440mWh 5 80 710 mAh output of iPhone 3G recharges 830 mAh 1200 mAh 0 60 These batteries will give you 60 charge up on your iPhone Note that these calculations will give y
52. nly iPhone 3GS 4 iPod Touch v2 and other 2010 iPhones This has been fixed in v3 of the Mintyboost Adafruit Industries http learn adafruit com minty boost Page 61 of 99 e Sidekick LX2009 one report e MuVo Slim one report e Sony EBook reader e Motorola Q one report e Nokia 8600 phones require a driver to charge so are unlikely to work Adafruit Industries http learn adafruit com minty boost Page 62 of 99 Dd adafruit learning system Process How to How to Meta Documentation This page details how went through the process of coming up with the idea hardware design etc for this project It s not 100 correct but it s pretty close Since this project only took 2 days on amp off to design test release it s a lot easier to keep track of than something enormous like the xOxbOx http adafru it c46 This tutorial is quite old and the Mintyboost has gone thru many revisions since then http adafru it c3y We suggest that after you read this you go on to read our Apple Charging Secrets tutorial which will take you from v1 here to the latest v3 http adafru it c 3k Original Idea OK so where does an idea come from anyways It s the only important question amp the most difficult guess I d have to say it was prompted by looking at these half dozen projects e Aaron Dunlaps http adafru it c48 9V USB charger e Another 9V 7805 USB charger http adafru it c49 Instructables e
53. ode is part of the boost converter Essentially it is used to make sure energy is transfered in only one direction from the batteries to the USB port Diodes have a special property that current can only pass thru them in one direction That means that it is important to make sure that they are not inserted in backwards Examine the diode and find the end with a white stripe This stripe should match up with the silkscreen image which also has a Stripe on one end In this image it is towards the top Solder and clip the diode Lookin good Make sure there are no Shorted wires or dirty solder joints http learn adafruit com minty boost Page 32 of 99 Adafruit Industries Next is the IC socket This protects the chip and allows you to replace it if there are any problems The socket goes over the 3 3K resistor but the resistor should not interfere as long as it was soldered in properly Make sure you solder the socket in so that the notch in the edge of the socket matches up with the notch in the Silkscreen image of the socket In this image it s near the bottom If you mess this up dont try to desolder the socket instead just keep going and remember that it is upside down later when it s time to install the chip The socket has short legs so it can be annoying to keep in the right position Hold it in place with one finger and tack solder a corner Once that is done solder in the remaining 7 pins
54. ola Samsung Sony Ericsson Nokia RIM More Phones eBook Readers Handheld Games MP3 Player Compat v2 Device Compatibility for v2 x Mintyboosts For version 2 x only Mintyboost Compatibility chart Process How to How to Adafruit Industries http learn adafruit com minty boost 48 48 48 48 49 49 50 50 51 52 52 52 54 54 54 54 55 55 56 56 57 57 57 58 58 58 59 60 60 60 60 63 63 Page 4 of 99 Meta Documentation 63 Original Idea 63 Engineering better 64 Case in point 64 Basic Boost 70 Inductive reasoning 71 Rapid prototyping 1 72 Testing the prototype 78 Verifying the math 19 Kit budgeting 82 Finishing up 84 iCharging 88 The mysteries of Apple device charging 88 The Video 88 Quick introduction to USB 88 Using USB as a power supply 89 iCharge 89 First attempt 90 The iPhone and larger iPods 91 iPhones 92 Change Log 96 What s changed 96 A long history of boosting 96 V1 0 June 2006 first release 96 v1 1 July 2006 96 v1 2 April 2007 96 v2 0 August 2008 97 v3 0 August 2010 97 Download 99 Downloads 99 v2 0 files 99 v1 0 v1 1 and v1 2 files 99 Datasheets 99 Adafruit Industries http learn adafruit com minty boost Page 5 of 99 ve adafruit learning system Overview Minty Boost Portable USB power A small battery powered USB charger Overview This project details a small amp simple but very powerful USB charger for your mp3 player Adafr
55. oost is a registered trademark of Adafruit Industries Adafruit Industries http learn adafruit com minty boost Page 13 of 99 ve adafruit learning system Preparation Learn how to solder with tons of tutorials http adafru it aT k Don t forget to learn how to use your multimeter too http adafru it aZZ Tools There are a few tools that are required for assembly None of these tools are included If you don t have them now would be a good time to borrow or purchase them They are very very handy whenever assembling fixing modifying electronic devices provide links to buy them but of course you should get them whereever is most convenient inexpensive Many of these parts are available in a place like Radio Shack or other higher quality DIY electronics stores Soldering iron Any entry level all in one soldering iron that you might find at your local hardware store should work As with most things in life you get what you pay for Upgrading to a higher end soldering iron setup like the Hakko FX 888 that we stock in our store http adafru it 180 will make soldering fun and easy Do not use a ColdHeat soldering iron They are not suitable for delicate electronics work and can damage the kit see here http adafru it aOo Click here to buy our entry level adjustable 30W 110V soldering iron http adafru it 180 Click here to upgrade to a Genuine Hakko FX 888 adjustable temperature solde
56. ou a reasonable approximation and an upper bound As the batteries age their capacity decreases The internal charger of whatever you re charging may also not be 100 efficient Keep this in mind but don t be surprised if it s an upper limit Detailed guidelines Voltage Requirements The Mintyboost converts a low voltage to 5V USB standard Because of this the first thing you must be aware of is that you cannot put a higher than 5v battery on the inputs to the circuit If you do it could damage the kit So make sure your battery unput is always below 5V Do not use 9V batteries under any circumstance Another important thing to realize is that the chip inside the MintyBoost also has a minimum voltage requirement which is 2V So do not try to run it off of a single AA battery or similar Your best bet is to keep the battery input between 2V and 4 5V Under 2V the chip won t work above 4 5V the chip becomes less efficiant for extremely technical reasons that we won t go into right here and above 5V it will not be able to keep the voltage at a steady 5V Detailed guidlines Current Requirements Many devices now charge at 500mA or higher rate which translates into a 1000 mA draw from the batteries because the voltage is boosted the current is also boosted Getting batteries with low internal resistance and high mAh capacity Is key Try to aim for at least 2000mAh capacity of your 1 5v batteries For Lithium ion poly 3 7v cells 1
57. ove They re quite good Keep them in a window so you can watch and review as you work through the kit The first part we will place is the resistor R5 this is a small oval tan thing with two wires leads and color stripes The stripes are Orange orange red which indicates a 3 3K resistor This resistor is used to improve the high current Capability of the boost converter chip and is a new addition to the mintyboost The resistor goes right in the middle over the silkscreen text that says R5 Resistors are non polar which means they don t have a direction you don t have to worry about putting it in backwards because they work the same Adafruit Industries http learn adafruit com minty boost Page 26 of 99 Adafruit Industries either way Bend the resistor into a staple and slip it onto the top of the Printed Circuit Board Bend the little leads out so that you can flip over the PCB and the resistor will stay in place Now you ll solder Place the flat of the soldering iron tip against the silver ring pad and one of the wires of the resistor lead at the same time for 2 seconds This will heat them both up to 600 700 degrees Then poke the end of the solder so that it flows into the hole and forms a solder joint Solder joints should be smooth and shiny and fill the entire pad wicking up to the lead You shouldn t be able to wiggle the wire and have it move in the hole http learn adafruit com m
58. protection and aesthetics How many charges hours of use can I get out of a MintyBoost This question is hard to judge because every device has different power usage However a Simple way to calculate approximate run time is take the size of the internal Lithium lon battery for example many iPods have 750mAh batteries and divide 1000 by that number So fora 750mA battery 1000 750 1 3 The MintyBoost will fully charge the device about 1 3 times as a best case Remember this is only an approximation and has a lot to do with the quality of the batteries you use expensive alkalines v cheap rechargables and the internal circuitry of the device for recharging the battery For a detailed mathematical analysis check the user manual under How many recharges will get http adafru it c35 want better performance should I attach 3 or 4 AA batteries How about a 9V Check out our detailed battery power tutorial http adafru it c35 OK but what if want 4 AA s 2 sets of 2 in parallel Check out our detailed battery power tutorial http adafru it c35 When I use the kit the chip batteries seems warm or hot ls this OK It s normal for the chip and batteries to be warm or hot especially when charging a device that is nearly drained The chip should not get hot or very warm when nothing is plugged in The maximum temperature for the mintyboost chip is over 100 degrees C that is hotter than boiling water If you are
59. quality Duracell Energizer high drain alkaline batteries High quality Duracell Energizer alkaline batteries Non brand Alkaline batteries Other kinds of non rechargable AA batteries zinc etc Snn Adafruit Industries http learn adafruit com minty boost Page 48 of 99 Higher quality batteries will give you longer boost times cheap or dead batteries are the leading cause of flaky behavior so be sure to get good batteries Don t mix dead and non dead cells or different kinds of cells If you buy 2 batteries in a pack keep them together This will get you the best performance Rechargable AA s You can use rechargable batteries in the Mintyboost as well Here in approximate order of effectiveness are the non rechargable batteries you will want to use 1 High capacity 2500mAh high quality NiMH batteries See the standard in testing the NiMH shootout http adafru it c3C 2 Eneloop 3 Non brand medium capacity NiMH batteries See the standard in testing the NiMH Shootout http adafru it c3C 4 NiZn batteries We haven t actually tested these so we are not 100 Sure if they perform well but they should be OK 5 NiCad batteries Good quality NiMH batteries work fantastic but be careful of using really old cells Don t mix dead and non dead cells or different kinds brands of cells If you buy 2 batteries in a pack keep them together and charge use them at the same time This will get you the b
60. ries http learn adafruit com minty boost Page 70 of 99 voltage options Voltage Irmpui Voltage Output Adjustable Adjustable Hegatwe Output PADB 7 Looking over this list it looks like have a lot of options so l m going to go back and select only the chips that can be preset to 5V as opposed to adjustable ones that use 2 resistors to set the voltage 5V is very common so every reasonable DC DC chip will be available with such an option Now there are about a dozen options The LT1073 LT1111 LT1173 and LT130x as well as the MAX751 amp MAX756 They re all pretty much the same so I basically make my choice based on price at 100 pieces since l m planning to kit it up also know that Maxim is great about sending samples so I decide to go with the MAX756 datasheet http adafru it c4e which is 2 32 100 Note that could have gone with any of them so this a somewhat arbitrary choice According to the datasheet can supply up to 200mA 5V run off input voltages as low as 0 7V and the efficiency is about 85 with 2 AA batteries The chip also runs at 500KHz which is pretty fast and means that the inductor can be pretty small 22uH Anyway I ve used this chip before and it s worked out well for me Inductive reasoning The next step is to choose an inductor This can be a bit of a pain and there is a lot of math you can throw at the problem However the datasheet suggests under inductor selection to get a 2
61. ring iron http adafru it 303 Solder You will want rosin core 60 40 solder Good solder is a good thing Bad solder leads to bridging and cold solder joints which can be tough to find A Click here to buy a spool of leaded solder recommended for beginners http adafru it 145 Adafruit Industries http learn adafruit com minty boost Page 14 of 99 Click here to buy a spool of lead free solder http adafru it 7 34 Multimeter You will need a good quality basic multimeter that can measure voltage and continuity Click here to buy a basic multimeter http adafru it 71 Click here to buy atop of the line multimeter http adafru it 308 Click here to buy a pocket multimeter http adafru it 850 Flush Diagonal Cutters You will need flush diagonal cutters to trim the wires and leads off of components once you have soldered them in place Click here to buy our favorite cutters http adafru it 152 Adafruit Industries http learn adaf ruit com minty boost Page 15 of 99 Adafruit Industries Solder Sucker Strangely enough that s the technical term for this desoldering vacuum tool Useful in cleaning up mistakes every electrical engineer has one of these on their desk Click here to buy a one http adafru it 148 Helping Third Hand With Magnifier Not absolutely necessary but will make things go much much faster and it will make soldering much easier
62. rom Maxim http adafru it c3T and could provide about 100 150mA output at 5V There were no data line resistors for pulling up or down but it worked with most things v1 1 July 2006 200 500ohm After a few months it became clear that some devices especially Apple music players needed pullup down resistors so a new version that could fit 1 pullup and 1 pulldown was designed This version still used the MAX756 http adafru it c3T v1 2 April 2007 Schematic is essentially the same as the v1 1 but with an additional resistor slot from D to ground Turns out that some devices wanted two pullups on either data pin so version 1 2 had an Adafruit Industries http learn adafruit com minty boost Page 96 of 99 option to use D s R5 resistor as either a pulldown or pullup This version still used the MAX756 http adafru it c3T v2 0 August 2008 3V battery ot zs cr c3 Le au GND 5 5 ne Ee T D insg A wi 100K z l R4 E DA ES iok A U E s 290uF LT1302 GND E GHD C2 0 1uF E GND Smartphones started coming out and becoming popular and devices with massive batteries which meant that charging at 100mA was ano go The mintyboost was then upgraded to the LT1302 http adafru it c3U amore expensive chip but one with a nice 500mA output ability This version worked pretty well for a very long time until about the iPhone 3Gs came out at which point Apple became a lot pickier about aut
63. site stuff also take a lot of photos A good photo setup will make documentation easy have a simple 150W ECT bulb diffuser setup at EYEBEAM A tripod is key Adafruit Industries http learn adafruit com minty boost Page 86 of 99 Mintyboost is a registered trademark of Adafruit Industries Adafruit Industries http learn adafruit com minty boost Page 87 of 99 De adafruit learning system Charging The mysteries of Apple device charging The Video TL DR Watch this video which not only talks about iPhones and charging but also hot air rework Want more details Read below Quick introduction to USB Every computer has a USB connector on it and all the connectors are the same with 4 pins One pin is Ground two pins are Data D and D and the last pin is 5V power The Ground and 5V pins are used to provide power to whatever is plugged in keyboard mouse USB key etc The two data lines are used to transfer information back and forth what keys are pressed Saving files to the USB drive etc Adafruit Industries http learn adafruit com minty boost Page 88 of 99 Shown above the 4 wires Red is power black is ground and the white and green wires are the data lines Using USB as a power supply Some inexpensive USB toys say a USB fan or mini soda cooler http adafru it c3Q don t have any data transfer they just suck the power from the USB port to run In this case they do not use or connect
64. t Industries http learn adafruit com minty boost Page 24 of 99 GND 200 500o0hm LED1 R1 R2 and R3 are optional not included in the kit and should be installed only if the user wants the Low Battery Indication function Check the MAX756 datasheet for information on how to pick R1 and R2 R5 should be installed as either a pulldown or pullup like R4 inthe V1 2 pcb there are two positions possible Mintyboost is a registered trademark of Adafruit Industries Adafruit Industries http learn adafruit com minty boost Page 25 of 99 ve adafruit learning system Solder it Instructions for Version 3 0 These are the instructions for v3 0 if you have an older mintyboost you may want to check out the specific instructions for earlier versions http adafru it c3z Solder It The first step is to solder the kit together If you ve never soldered before check the Preparation page for tutorials and more http adafru it c3s First Check the Bill of Materials to verify you have all the parts necessary to make the kit http adafru it c3t Most importantly check which version of the kit you have Look at the packaging and the PCB find that v3 thats on the back near the top Place the PCB in a vise and turn on the soldering iron Make sure you have all the tools you ll need to assemble the kit http adafru it c3s If you don t know how to solder we Suggest checking out the videos in the link ab
65. to keep the inductor small also need to be able to supply 100mA at 5V and it should run on as low as 2V input Also want to be able to buy it online from a common supplier 8 DIP package Internal FET switch 100mA output 5V 2V minimum input voltage a YN OK lets search Digikey start with DC DC converter 8 DIP and check items in stock Ciok Nere ZN dn Keywords DC DC converter 8 DIP M Items in Stock Ci Lead Free C RoHS Compliant Advanced Integrarea Circuits IC s pcmc Comverters amp Controllers DC DC Package Current Output Features of Output Power Case Outputs UUM a a 1 5 A a a 2 300mw 30mA CMOS 500mWw 10 DIP tn i Cycle by Cycle Current Limiting Overcurrent Soft Start amp Undervoltage Protection 550mW 18 DIP 50mA Generates Positive amp Negative Doubled Outputs Simultaneously 700mWw High Efficiency 727 7mwW High Efficiency at Low input Voltages 730mW High Efficiency Burst Mode TM amp Current Mode Operation Tw ik High Efficiency Burst Mode TM Operation 1 175W i High Efficiency Internal Power Switches Shutdown amp Low Battery Detector v 125W then select 1 output 8 DIP to differentiate between 18 DIP and select all the current outputs gt 100mA and apply the filter There s still about 40 options So then I select the all voltage input ranges that start with 2V or less Also I select all the Adjustable and 5V inclusive output Adafruit Indust
66. uit Industries http learn adaf ruit com minty boost Page 6 of 99 camera cell phone and just about any other gadget you can plug into a USB port to charge See below for compatibility tests The charger circuitry and 2 AA batteries fit into an Altoids gum tin and will run your iPod for hours 2 5x more than you d get from a 9V USB charger See Process http adafru it c34 for math calculations You can use rechargable batteries too http adafru it c35 Specifications e Version 3 now works with iPhones and newer iGadgets e 5V output 500MA output e Fits in your pocket e Recharges just about any gadget with a USB cable e Uses any AA batteries http adafru it c35 e Upgrade to C or D cells for a mega battery pack http adafru it c35 Some numbers e iPhone all types 3 4 full recharge e iPod video tested using alkaline batteries 3hrs more video 1 full recharge e iPod mini tested w rechargables 26 hours more 1 5 full recharges e iPod nano 4 full recharges e iPod shuffle 60 hours more 5 full recharges This project is suitable for beginners some soldering tools are necessary but even if you ve never soldered before it should be pretty easy You can etch a circuitboard and or breadboard this up or simply buy a kit from the webshop http adafru it aK1 I ve also documented the process of designing this kit http adafru it c 34 in case other people interested in designing and making kits
67. ut they re finicky Check the FAQ and try Lithium 1 5V batteries Unfortunately Apple has made updates to the firmware and hardware to make it harder for people to use nonauthorized chargers This has been fixed in v3 of the Mintybo ost e Arcos 605 WiFi e AT amp T 8525 a k a HTC Hermes e AudioVox 6700 use R5 as a pullup e Blackberry e BT 1 http adafru it c3F bluetooth camera e Cowon iAudio X5 e Creative Zen Micro tested with firmware v1 11 01 e Creative Zen Vision M Doesn t work through USB but does work with a DC connector adaptor as sold in the webshop http adafru it 23 e Dell DJ Ditty e Garmin Edge 305 e Garmin Forerunner 305 unplug it when its done charging or it can drain itself e Gigabeat S30 Doesn t work thru USB but does work with a DC connector adaptor as sold in the webshop http adafru it 23 e GlobalSat s DG 100 GPS datalogger e HOLUX GPSlim236 bluetooth GPS e iMate Jam iMate SP5 smartphone Adafruit Industries http learn adafruit com minty boost Page 60 of 99 iPaq 5555 pocket pc iRiver Clix u10 iRiver E10 use pulldown iRiver H340 http adafru it c3G Locosys Technologies BGT 11 GPS LG enV2 VX9100 M AUDIO Microtrack 24 96 Microsoft Zune MobiBLU DAH 1500i Motorola Quanitco Mrobe 500 100 with adaptor cable http adafru it 23 Nintendo DS GameBoy Advance with adaptor cable http adafru it 22 Nokia phones using cables CA 70 and CA 100 will charge ne
68. ve adafruit learning system Minty Boost Created by Ladyada Last updated on 2014 03 16 12 31 18 AM EDT Guide Contents Guide Contents 2 Overview 6 Minty Boost Portable USB power 6 A small battery powered USB charger 6 Overview 6 Reviews amp Gallery 8 Device Compatibility 8 F A Q 9 Frequently Asked Questions 9 It works But then the iPod iPhone device gets drained what s up 9 How come my iPhone iTouch doesn t completely charge 9 Will the MintyBoost charge my device 9 ARRGH It doesn t work 9 get the right voltages but it doesn t charge my favorite gadget Is the kita USB Specification Charger If not how can make it into one 9 Can buy a pre made pre built MintyBoost 10 What does the MintyBoost kit come with 10 How many charges hours of use can get out of a MintyBoost 10 want better performance should attach 3 or 4 AA batteries How about a 9V 10 OK but what if want 4 AA s 2 sets of 2 in parallel 10 When use the kit the chip batteries seems warm or hot Is this OK 10 But it s really hot and I m worried 10 When I plug in a device sometimes theres a hum hiss squeak whine etc noise is this normal 11 lf this is a charger why are the data D and D lines used Why doesn t the 3Gs work with the Mintyboost v2 but the older iPhone does What are the pullup down resistors used for and which should use 11 Does the v1 x work with iPhone iTouch Does the v2 0 11 C
69. w power to charge up the battery While charging While charging your device you may notice the Mintyboost and batteries getting very hot This is normal it s because of how much power is being delivered to the gadget The Mintyboost will cool down as soonas you unplug it The maximum temperature for the mintyboost chip is over 100 degrees C that is hotter than boiling water If you are worried lick your finger a little and touch the tip of your finger to the top of the LT1302 chip If you don t hear a sizzle of the water boiling away it s just fine If the mintyboost is getting really hot when it s not plugged in there may be a short Remove the batteries and check to make sure there is insulation between the mintyboost PCB and tin Adafruit Industries http learn adafruit com minty boost Page 46 of 99 You may also hear a hiss or squeak coming out of the chip Sometimes the inductor resonates with the boost converter and that resonance leaks into the audible range While it s not good for it to always vibrate it does happen rarely and is not harmful to the charging device You can try moving the inductor a little with your finger but the noise is electrical in nature so it s hard to stop completely Another thing is that it depends on how much power the device is drawing and what kind of batteries are inside When to stop charging The mintyboost will charge and charge until the batteries give out and the voltage output

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