MCP1612 Evaluation Board User's Guide
Contents
1. MICROCHIP M CP1612 Evaluation Board User s Guide 2005 Microchip Technology Inc DS51529A Note the following details of the code protection feature on Microchip devices Microchip products meet the specification contained in their particular Microchip Data Sheet Microchip believes that its family of products is one of the most secure families of its kind on the market today when used in the intended manner and under normal conditions There are dishonest and possibly illegal methods used to breach the code protection feature All of these methods to our knowledge require using the Microchip products in a manner outside the operating specifications contained in Microchip s Data Sheets Most likely the person doing so is engaged in theft of intellectual property Microchip is willing to work with the customer who is concerned about the integrity of their code Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code Code protection does not mean that we are guaranteeing the product as unbreakable Code protection is constantly evolving We at Microchip are committed to continuously improving the code protection features of our products Attempts to break Microchip s code protection feature may be a violation of the Digital Millennium Copyright Act If such acts allow unauthorized access to your software or other copyrighted work you may have a right to sue for rel2. Off On 2 4V On On 3 3V 4 With Vin applied verify that Vour agrees with the switching settings listed above 5 A resistor pulls the shutdown SHDN pin up to Vin making the circuit always enabled The circuit can be disabled by pulling the SHDN TP8 pin to ground 1 4 HOW IT WORKS 1 4 1 MCP1612 Functions The MCP1612 is a fixed 1 4 MHz synchronous buck regulator that has integrated switching and synchronous MOSFETs Other features integrated into the device include shutdown control soft start undervoltage lockout overcurrent and overtemperature protection The high switching frequency allows the use of a smaller inductor and filter capacitors which ultimately lead to a space saving design The out put voltage is set by a simple resistor divider network and compensation is accom plished by a series resistor capacitor to ground 1 4 2 Power Topology and Output Regulation The MCP1612 is a buck regulator with integrated switching and synchronous MOSFETs Under normal operation current ramps up in the buck inductor when the P channel MOSFET is on This current is sensed and compared to the output of the error amplifier The error amplifier output is the difference between the internal 0 8V reference and the divided down Vour When the sensed inductor current ramps up to the point that is equal to the amplifier error signal the P channel MOSFET is turned off and the N channel synchronous MOSFET is turned on until t
3. Tel 886 7 536 4818 Fax 886 7 536 4803 Taiwan Taipei Tel 886 2 2500 6610 Fax 886 2 2508 0102 Taiwan Hsinchu Tel 886 3 572 9526 Fax 886 3 572 6459 EUROPE Austria Weis Tel 43 7242 2244 399 Fax 43 7242 2244 393 Denmark Ballerup Tel 45 4450 2828 Fax 45 4485 2829 France Massy Tel 33 1 69 53 63 20 Fax 33 1 69 30 90 79 Germany Ismaning Tel 49 89 627 144 0 Fax 49 89 627 144 44 Italy Milan Tel 39 0331 742611 Fax 39 0331 466781 Netherlands Drunen Tel 31 416 690399 Fax 31 416 690340 England Berkshire Tel 44 118 921 5869 Fax 44 118 921 5820 10 20 04 DS51529A page 16 2005 Microchip Technology Inc
4. ECJ 2FB1C475K 2 C1 C9 Capacitor 10 uF 0805 MuRata Electronics GRM21BR61A106KE19L 2 C3 C7 Capacitor 560 pF 0603 TDK Electronics Co LTD C1608C0G1H561J 4 C4 C5 C10 C12 Do Not Populate C13 C14 2 L1 L2 3 3 uH Inductor Coilcraft DO1608C 332 1 U2 MCP 1612 DFN Microchip MCP1612 ADJI MF Technology Inc 1 U1 MCP1612 MSOP Microchip MCP1612 ADJI MS Technology Inc 2 R2 R8 Resistor 100 0603 Yageo America 9C06031A10ROFKHFT 2 R3 R12 Resistor 24 9 kQ 0603 Yageo America 9C06031A2492FKHFT 1 R10 Resistor 86 6 kQ 0603 Yageo America 9C06031A8662FKHFT 1 R9 Resistor 154 kQ 0603 Yageo America 9C06031A1543FKHFT 2 R6 R11 Resistor 174 kQ 0603 Yageo America 9C06031A1743FKHFT 1 R5 Resistor 348 kQ 0603 Yageo America 9C06031A3483FKHFT 2 R1 R7 Resistor 500 kQ 0603 Yageo America 9C06031A5003FKHFT 1 R4 Resistor 698 kQ 0603 Yageo America 9C06031A6983FKHFT 2 S1 S2 DIP Switch ITT Industries C amp K Div TDAO2HOSK1 10 TP1 TP2 TP3 SMT Test Point Keystone Electronics 5016 TP4 TP5 TP6 TP7 TP8 TP9 TP10 2005 Microchip Technology Inc DS51529A page 15 MICROCHIP WORLDWIDE SALES AND SERVICE AMERICAS Corporate Office 2355 West Chandler Blvd Chandler AZ 85224 6199 Tel 480 792 7200 Fax 480 792 7277 Technical Support http support microchip com Web Address www microchip com Atlanta Alpharetta GA Tel 770 640 0034 Fax 770 640 0307 Boston Westford MA Tel 978 692 3
5. dialog Initial caps A window the Output window A dialog the Settings dialog A menu selection select Enable Programmer Quotes A field name in a window or __ Save project before build digit Underlined italic text with A menu path File gt Save right angle bracket Bold characters A dialog button Click OK A tab Click the Power tab pnnnn A binary number where nis a 00100 b10 Text in angle brackets lt gt A key on the keyboard Press lt Enter gt lt F1 gt Courier font nis a hexadecimal digit Plain Courier Sample source code define START Filenames autoexec bat File paths c mcecl18 h Keywords _asm _endasm static Command line options Opa Opa Bit values 0 1 Italic Courier A variable argument file o where file can be any valid filename Oxnnnn A hexadecimal number where OxFFFF 0x007A Square brackets Optional arguments mcc18 options file options Curly brackets and pipe character Choice of mutually exclusive arguments an OR selection errorlevel 0 1 Ellipses Replaces repeated text var_name var_name Represents code supplied by user void main void RECOMMENDED READING The following Microchip documents are available and recommended as supplemental reference resources MCP1612 Data Sheet Single 1A 1 4 MHz Synchronous Buck Regulator DS21921 The data s
6. is the document number and A is the revision level of the document For the most up to date information on development tools see the MPLAB IDE on line help Select the Help menu and then Topics to open a list of available on line help files INTRODUCTION This chapter contains general information that will be useful to know before using the MCP1612 Evaluation Board ltems discussed in this chapter include e About This Guide e Recommended Reading The Microchip Web Site e Customer Support ABOUT THIS GUIDE Document Layout This document describes how to use the MCP1612 Evaluation Board The manual layout is as follows e Chapter 1 Installation and Operation Describes how to use the various features of the MCP1612 Evaluation Board e Appendix A Schematic and Layouts Shows the schematic and Printed Circuit Board PCB layout diagrams for the MCP1612 Evaluation Board e Appendix B Bill of Materials Shows the parts used to build the MCP1612 Evaluation Board O 2005 Microchip Technology Inc DS51529A page 1 DS51529A page 2 Conventions Used in this Guide MCP1612 Evaluation Board User s Guide This manual uses the following documentation conventions DOCUMENTATION CONVENTIONS Description Represents Examples Arial font Italic characters Referenced books MPLAB IDE User s Guide Emphasized text iS the only compiler
7. 848 Fax 978 692 3821 Chicago Itasca IL Tel 630 285 0071 Fax 630 285 0075 Dallas Addison TX Tel 972 818 7423 Fax 972 818 2924 Detroit Farmington Hills MI Tel 248 538 2250 Fax 248 538 2260 Kokomo Kokomo IN Tel 765 864 8360 Fax 765 864 8387 Los Angeles Mission Viejo CA Tel 949 462 9523 Fax 949 462 9608 San Jose Mountain View CA Tel 650 215 1444 Fax 650 961 0286 Toronto Mississauga Ontario Canada Tel 905 673 0699 Fax 905 673 6509 ASIA PACIFIC Australia Sydney Tel 61 2 9868 6733 Fax 61 2 9868 6755 China Beijing Tel 86 10 8528 2100 Fax 86 10 8528 2104 China Chengdu Tel 86 28 8676 6200 Fax 86 28 8676 6599 China Fuzhou Tel 86 591 8750 3506 Fax 86 591 8750 3521 China Hong Kong SAR Tel 852 2401 1200 Fax 852 2401 3431 China Shanghai Tel 86 21 5407 5533 Fax 86 21 5407 5066 China Shenyang Tel 86 24 2334 2829 Fax 86 24 2334 2393 China Shenzhen Tel 86 755 8203 2660 Fax 86 755 8203 1760 China Shunde Tel 86 757 2839 5507 Fax 86 757 2839 5571 China Gingdao Tel 86 532 502 7355 Fax 86 532 502 7205 ASIA PACIFIC India Bangalore Tel 91 80 2229 0061 Fax 91 80 2229 0062 India New Delhi Tel 91 11 5160 8631 Fax 91 11 5160 8632 Japan Kanagawa Tel 81 45 471 6166 Fax 81 45 471 6122 Korea Seoul Tel 82 2 554 7200 Fax 82 2 558 5932 or 82 2 558 5934 Singapore Tel 65 6334 8870 Fax 65 6334 8850 Taiwan Kaohsiung
8. ICDEM net dsPICworks ECAN ECONOMONITOR FanSense FlexROM fuzzyLAB In Circuit Serial Programming ICSP ICEPIC MPASM MPLIB MPLINK MPSIM PICkit PICDEM PICDEM net PICLAB PICtail PowerCal Powerlnfo PowerMate PowerTool rfLAB rfPICDEM Select Mode Smart Serial SmartTel and Total Endurance are trademarks of Microchip Technology Incorporated in the U S A and other countries SQTP is a service mark of Microchip Technology Incorporated in the U S A All other trademarks mentioned herein are property of their respective companies O 2005 Microchip Technology Incorporated Printed in the U S A All Rights Reserved LI Printed on recycled paper Microchip received ISO TS 16949 2002 guality system certification for its worldwide headguarters design and wafer fabrication facilities in Chandler and Tempe Arizona and Mountain View California in October 2003 The Company s quality system processes and procedures are for its PICmicro 8 bit MCUs KEELOG code hopping devices Serial EEPROMs microperipherals nonvolatile memory and analog products In addition Microchip s quality system for the design and manufacture of development systems is ISO 9001 2000 certified DS51529A page ii 2005 Microchip Technology Inc MCP1612 Evaluation Board MICROCHIP User s Guide Table of Contents Pref amp C EE 1 Chapter 1 Installation and Operation nes 5 1 1 Introduchon nn nn r nn nn r rr 5 1 2 Evaluation Board Des
9. R5 C5 ze 698K DNP 348K AGND AGND VIN_ 2 1 1 L2 R8 u2 3 3uH c9 10 8 OR t 1 VOUT 2 CHE 1 Vin Lx 10 2 E R7 PGND 7 R11 S i 500K 3 l on AGND 6 174K T BEN DNP PGND2 m A AGND2 PGND2 GC C FB Lon S ake 1uF U_MCP1612_DFN8 f 1 8 PGND2 PGND2 R12 2 9K i s2 PGND2 AGND2 S nF 1 SHDN2 C7 560pF als R10 DNE R9 2 86 6K 154K AGND2 AGND2 DS51529A page 10 2005 Microchip Technology Inc Schematic and Board Layouts A 3 TOP SILK SCREEN LAYER MICROCHIP SUE E Ek De 000 LI S r 0000 J 000 m 2005 Microchip Technology Inc MCP1612 Evaluation Board Users Guide AA TOP METAL LAYER MIEBOEHIO DS51529A page 12 2005 Microchip Technology Inc Schematic and Board Layouts A 5 BOTTOM METAL LAYER A V1A EROOO ROT 2005 Microchip Technology Inc DS51529A page 13 MCP1612 Evaluation Board Users Guide Ap BOTTOM SILK SCREEN LAYER TOP VIEW DS51529A page 14 2005 Microchip Technology lnc MCP1612 Evaluation Board User s Guide MICROCHIP Appendix B Bill of Materials BOM TABLE B 1 BILL OF MATERIALS BOM Qty Reference Description Manufacture Manufacture P N 2 C2 C11 Capacitor 0 1 UF 0603 KEMET Electronics C0603C104J4RACTU 2 C6 C8 Capacitor 4 7 uF 0805 Panasonic ECG
10. criptions the n ant 5 1 3 HOW ILIS USO nt Dites atd 6 1 4 How it Works nn nn nn nn nn ne E E 7 Appendix A Schematic and Board Layouts 9 AA Tan te Le JU ere ya u Su AAA an 9 A 2 Schema AA e Ee 10 AS Top Silk Screen EE 11 A4 Top Metal Lay udo u WA Wa 12 A 5 Bottom Metal Layer nn namana wananunua nanu nn ener rn 13 A 6 Bottom Silk Screen Layer Top View 14 Appendix B Bill of Materials BOM J T J 15 B 1 IA c t m ico 15 Worldwide Sales and Service RR RR En nuzazaa 16 2005 Microchip Technology Inc DS51529A page iii MCP1612 Evaluation Board Users Guide NOTES DS51529A page iv 2005 Microchip Technology Inc MCP1612 Evaluation Board MICROCHIP User s Guide Preface All documentation becomes dated and this manual is no exception Microchip tools and documentation are constantly evolving to meet customer needs so some actual dialogs and or tool descriptions may differ from those in this document Please refer to our web site www microchip com to obtain the latest documentation available Documents are identified with a DS number This number is located on the bottom of each page in front of the page number The numbering convention for the DS number is DSXXXXXA where XXXXX
11. he beginning of the next switching cycle 2005 Microchip Technology Inc DS51529A page 7 MCP1612 Evaluation Board Users Guide NOTES DS51529A page 8 2005 Microchip Technology Inc MCP1612 Evaluation Board MICROCHIP User s Guide Appendix A Schematic and Board Layouts A 1 INTRODUCTION This appendix contains the schematic and Printed Circuit Board PCB layout diagrams for the MCP 1612 Evaluation Board A 1 1 Highlights The MCP1612 Evaluation Board is constructed using a two layer PCB The top and bottom layers are for components and traces Diagrams included in this appendix e Schematic e Top Silk Screen Layer e Top Metal Layer Bottom Metal Layer Bottom Silk Screen Layer 2005 Microchip Technology Inc DS51529A page 9 MCP1612 Evaluation Board Users Guide VIN 1 t L1 ut 3 3uH El c1 1 Vin ia S tor t i E 10uF u I eg PGND H RE PGND 500K 3 SHDN AGND amp 174k SCH SC F PGND i m AGND i 4 Comp FB 102 0 1uF U_MCP1612_MSOP8 2 PGND PGND 4 S R3 24 9K 104 si PGND SHDN_ 1 2 ___ AND DNE 1 a C3 560pF R4
12. heet provides detailed information regarding the MCP1612 buck regulator 2005 Microchip Technology Inc Preface THE MICROCHIP WEB SITE Microchip provides online support via our web site at www microchip com This web site is used as a means to make files and information easily available to customers Accessible by using your favorite Internet browser the web site contains the following information Product Support Data sheets and errata application notes and sample programs design resources users guides and hardware support documents latest software releases and archived software General Technical Support Frequently Asked Questions FAQs technical Support reguests online discussion groups Microchip consultant program member listing Business of Microchip Product selector and ordering guides latest Microchip press releases listing of seminars and events listings of Microchip sales offices distributors and factory representatives CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels e Distributor or Representative e Local Sales Office e Field Application Engineer FAE Technical Support e Development Systems Information Line Customers should contact their distributor representative or field application engineer FAE for support Local sales offices are also available to help customers A listing of sales offices and locations is included in the back
13. ief under that Act Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates It is your responsibility to ensure that your application meets with your specifications MICROCHIP MAKES NO REPRESENTATIONS OR WAR RANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED WRITTEN OR ORAL STATUTORY OR OTHERWISE RELATED TO THE INFORMATION INCLUDING BUT NOT LIMITED TO ITS CONDITION QUALITY PERFORMANCE MERCHANTABILITY OR FITNESS FOR PURPOSE Microchip disclaims all liability arising from this information and its use Use of Microchip s products as critical components in life support systems is not authorized except with express written approval by Microchip No licenses are conveyed implicitly or otnerwise under any Microchip intellectual property rights OUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV ISO TS 16949 2002 Trademarks The Microchip name and logo the Microchip logo Accuron dsPIC KEELOQ microID MPLAB PIC PICmicro PICSTART PRO MATE PowerSmart rfPIC and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U S A and other countries AmpLab FilterLab Migratable Memory MXDEV MXLAB PICMASTER SEEVAL SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U S A Analog for the Digital Age Application Maestro dsPICDEM dsP
14. itch S1 Table 1 1 lists the switch settings and Vour TABLE 1 1 S1 SWITCH SETTINGS AND Vour S1 Position 1 S1 Position 2 VouT Off Off 0 8V On Off 1 0V Off On 1 2V On On 1 4V 4 With Vin applied verify that Vour agrees with the switching settings listed above 5 A resistor pulls the shutdown SHDN pin up to Vin making the circuit always enabled The circuit can be disabled by pulling the SHDN TP3 pin to ground DS51529A page 6 2005 Microchip Technology Inc Installation and Operation 1 3 2 CKT Operation 1 Connect the 2 7V to 5 5V power supply to the Vin TP9 pin and the GND TP 10 pin Note 1 The MCP1612 will not operate until Vin is above the 2 7V threshold 2 Since the MCP1612 is a buck regulator Vour has to be lower than Vin Therefore it is recommended to ensure proper operation that Vin be greater than Vour plus 500 mV to 5 5V 2 Connect an electronic or resistive load between Vour TP pin and GND TP6 pin Note The MCP1612 is specified to deliver 0 to 1A of load current The internal overcurrent limit is 2 3A However care should be taken not to exceed the 1A current rating of the part 3 The values of Vour are predetermined and are selectable by a two position DIP switch S2 Table 1 2 lists the switch settings and Vour TABLE 1 2 S2 SWITCH SETTING AND Nour S2 Position 1 S2 Position 2 Vout Off Off 0 8V On Off 1 7V
15. o separate O to 1A buck regulator circuits One circuit CKT features the 8L MSOP package while the other circuit CKT gt features the 8L DFN package Each circuit has four different preset output voltage Vout settings The settings for Vour on CKT are 0 8V 1 0V 1 2V and 1 4V Refer to Section 1 3 1 CKT Operation for an explanation detailing how to set Vour The input voltage Vin of CKT can be 2 7V to 5 5V for any setting of Vout The settings for Voyy on CKT are 0 8V 1 7V 2 4V and 3 3V Refer to Section 1 3 2 CKT Operation for an explanation detailing how to set Vour Since the MCP1612 is a buck regulator Vour has to be lower than Vin Therefore it is recommended that Vin for CKT gt be greater than Vour plus 500 mV to 5 5V to ensure proper operation 2005 Microchip Technology Inc DS51529A page 5 MCP1612 Evaluation Board User s Guide 13 HOW IT IS USED 1 3 1 CKT Operation 1 Connect the 2 7V to 5 5V lab power supply to the Vin TP1 pin and the GND TP2 pin Note The MCP1612 will not operate until Vin is above the 2 7V threshold 2 Connect an electronic or resistive load between Vour TP4 pin and GND TP5 pin Note The MCP1612 is specified to deliver 0 to 1A of load current The internal overcurrent limit is 2 3A However care should be taken not to exceed the 1A current rating of the part 3 The values of Vour are predetermined and are selectable by a two position DIP sw
16. of this document Technical support is available through the web site at http support microchip com In addition there is a Development Systems Information Line which lists the latest versions of Microchip s development systems software products This line also provides information on how customers can receive currently available upgrade kits The Development Systems Information Line numbers are 1 800 755 2345 United States and most of Canada 1 480 792 7302 Other International Locations REVISION HISTORY Revision A January 2005 e Initial Release of this Document EH 2005 Microchip Technology Inc DS51529A page 3 MCP1612 Evaluation Board Users Guide NOTES DS51529A page 4 2005 Microchip Technology Inc MCP1612 Evaluation Board MICROCHIP User s Guide Chapter 1 Installation and Operation 1 1 INTRODUCTION The MCP1612 is a 1A 1 4 MHz fully integrated buck regulator The output voltage is selectable from 0 8V to Vin by use of an external resistor divider It is available in both the 8L MSOP and 8L DFN packages The MCP1612 Evaluation Board contains two independent buck regulators featuring the 8L MSOP and the 8L DFN packages The output voltage is set to one of eight different preset values four per regulator circuit by use of a two position DIP switch Each regulator circuit can supply an output current of 0 to 1A 1 2 EVALUATION BOARD DESCRIPTION The MCP1612 Evaluation Board consists of tw
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