MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide 2010 Microchip Technology Inc. DS51880A 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. 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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. © 2010, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. ISBN: 978-1-60932-023-2 Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® 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. DS51880A-page 2 2010 Microchip Technology Inc. MCP1640 SYNCHRONOUS BOOST CONVERTER EVALUATION BOARD USER’S GUIDE Table of Contents Preface ........................................................................................................................... 5 Introduction............................................................................................................ 5 Document Layout .................................................................................................. 5 Conventions Used in this Guide ............................................................................ 6 Recommended Reading........................................................................................ 7 The Microchip Web Site ........................................................................................ 7 Customer Support ................................................................................................. 7 Document Revision History ................................................................................... 8 Chapter 1. Product Overview 1.1 Introduction ..................................................................................................... 9 1.2 What is the MCP1640 Synchronous Boost Converter Evaluation Board? ..... 9 1.3 What the MCP1640 Synchronous Boost Converter Evaluation Board Includes .................................................................................................. 10 Chapter 2. Installation and Operation 2.1 Introduction ................................................................................................... 11 2.2 Features ....................................................................................................... 12 2.3 Getting Started ............................................................................................. 12 Appendix A. Schematic and Layouts A.1 Introduction .................................................................................................. 15 A.2 Board – Schematic ....................................................................................... 16 A.3 Board – Top Silk and Pads .......................................................................... 17 A.4 Board – Top Copper Layer .......................................................................... 18 A.5 Board – Bottom Copper Layer ..................................................................... 19 Appendix B. Bill of Materials (BOM) Worldwide Sales and Service .................................................................................... 22 2010 Microchip Technology Inc. DS51880A-page 3 MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide NOTES: DS51880A-page 4 2010 Microchip Technology Inc. MCP1640 SYNCHRONOUS BOOST CONVERTER EVALUATION BOARD USER’S GUIDE Preface NOTICE TO CUSTOMERS 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” 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 MCP1640 Synchronous Boost Converter Evaluation Board. Items discussed in this chapter include: • • • • • • Document Layout Conventions Used in this Guide Recommended Reading The Microchip Web Site Customer Support Document Revision History DOCUMENT LAYOUT This document describes how to use the MCP1640 Synchronous Boost Converter Evaluation Board as a development tool. The manual layout is as follows: • Chapter 1. “Product Overview” – Important information about the MCP1640 Synchronous Boost Converter Evaluation Board. • Chapter 2. “Installation and Operation” – Includes instructions on how to get started with this user’s guide and a description of the user’s guide. • Appendix A. “Schematic and Layouts” – Shows the schematic and layout diagrams for the MCP1640 Synchronous Boost Converter Evaluation Board. • Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the MCP1640 Synchronous Boost Converter Evaluation Board. 2010 Microchip Technology Inc. DS51880A-page 5 MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Arial font: Italic characters Initial caps Quotes Underlined, italic text with right angle bracket Bold characters N‘Rnnnn Text in angle brackets < > Courier New font: Plain Courier New Represents Referenced books Emphasized text A window A dialog A menu selection A field name in a window or dialog A menu path MPLAB® IDE User’s Guide ...is the only compiler... the Output window the Settings dialog select Enable Programmer “Save project before build” A dialog button A tab A number in verilog format, where N is the total number of digits, R is the radix and n is a digit. A key on the keyboard Click OK Click the Power tab 4‘b0010, 2‘hF1 Italic Courier New Sample source code Filenames File paths Keywords Command-line options Bit values Constants A variable argument Square brackets [ ] Optional arguments Curly brackets and pipe character: { | } Ellipses... Choice of mutually exclusive arguments; an OR selection Replaces repeated text Represents code supplied by user DS51880A-page 6 Examples File>Save Press <Enter>, <F1> #define START autoexec.bat c:\mcc18\h _asm, _endasm, static -Opa+, -Opa0, 1 0xFF, ‘A’ file.o, where file can be any valid filename mcc18 [options] file [options] errorlevel {0|1} var_name [, var_name...] void main (void) { ... } 2010 Microchip Technology Inc. Preface RECOMMENDED READING This user's guide describes how to use MCP1640 Synchronous Boost Converter Evaluation Board. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources. • MCP1640/B/C/D Data Sheet (DS22234) This data sheet provides detailed information regarding the MCP1640 device. • AN1311, Single Cell Input Boost Converter Design (DS01311) This application note details how to use the MCP1640 device in specific applications. 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, user’s guides and hardware support documents, latest software releases and archived software • General Technical Support – Frequently Asked Questions (FAQs), technical support requests, 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: • • • • Distributor or Representative Local Sales Office Field Application Engineer (FAE) Technical Support 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 of this document. Technical support is available through the web site at: http://support.microchip.com 2010 Microchip Technology Inc. DS51880A-page 7 MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide DOCUMENT REVISION HISTORY Revision A (February 2010) • Initial Release of this Document. DS51880A-page 8 2010 Microchip Technology Inc. MCP1640 SYNCHRONOUS BOOST CONVERTER EVALUATION BOARD USER’S GUIDE Chapter 1. Product Overview 1.1 INTRODUCTION The MCP1640 is a compact, high-efficiency, fixed frequency, step-up DC-DC converter. It provides an easy-to-use power supply solution, with a minimum number of external components for applications powered by one-cell, two-cell, or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries. The MCP1640 automatically selects the best operating mode for efficiency, Pulse Width Modulation (PWM) or Pulse Frequency (PFM); it has a low quiescent current (20 µA), a wide input voltage range (0.35 to 5.5V) and low start-up voltage (0.65V). The MCP1640 is available in SOT-23-6 and 2x3mm-8 DFN packages. This chapter provides an overview of the MCP1640 Boost Controller Evaluation Board and covers the following topics: • What is the MCP1640 Synchronous Boost Converter Evaluation Board? • Contents of the MCP1640 Synchronous Boost Converter Evaluation Board L1 4.7 µH VIN 0.9V To 1.7V SW V OUT VIN ALKALINE + - FIGURE 1-1: 1.2 CIN 4.7 µF EN VOUT 3.3V @ 100 mA 536 k VFB COUT 10 µF 309 k GND Typical MCP1640 Boost Converter Single Cell Battery Input. WHAT IS THE MCP1640 SYNCHRONOUS BOOST CONVERTER EVALUATION BOARD? The MCP1640 Synchronous Boost Converter Evaluation Board is used to evaluate and demonstrate Microchip Technology’s MCP1640 products. This board demonstrates the MCP1640 in two boost-converter applications with multiple output voltages. It can be used to evaluate both package options (SOT-23-6 and 2x3-8 DFN). The MCP1640 Synchronous Boost Converter Evaluation Board was developed to help engineers reduce the product design cycle time. Three common output voltages can be selected: 2.0V, 3.3V and 5.0V. The output voltage can be changed with a mini-dip switch that changes the external resistor divider. 2010 Microchip Technology Inc. DS51880A-page 9 MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide An enable (EN Switch selection) is used to enable and disable the MCP1640. When enabled, the MCP1640 will regulate the output voltage; when disabled, the MCP1640 disconnects the path from input to output for “true-disconnect”. Additional, MCP1640 options provide continuous switching and input to output bypass. For more information on these options, refer to the MCP1640/B/C/D datasheet. 1.3 CONTENTS OF THE MCP1640 SYNCHRONOUS BOOST CONVERTER EVALUATION BOARD This MCP1640 Synchronous Boost Converter Evaluation Board kit includes: • One MCP1640 Synchronous Boost Converter Evaluation Board unit, 102-00283 • Important Information "Read First" DS51880A-page 10 2010 Microchip Technology Inc. MCP1640 SYNCHRONOUS BOOST CONVERTER EVALUATION BOARD USER’S GUIDE Chapter 2. Installation and Operation 2.1 INTRODUCTION The MCP1640 is a compact, high-efficiency, fixed frequency, synchronous step-up dc-dc converter. It provides an easy-to-use power supply solution for applications powered by one-cell, two-cell, or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries in addition to distributed 3.3V to 5.0V applications. The MCP1640 is capable of regulating the output voltage over a wide 2.0V to 5.5V range and typically can deliver over 100 mA of load current at 3.3V output when supplied from a single 1.2V cell. The input voltage range is 0.35V to 5.5V with a low 0.65V start-up voltage. The regulated output voltage, VOUT should be greater than or equal to the input voltage, VIN. Additional device features are: automatic PWM / PFM transition to optimize efficiency, low device quiescent current (20 µA in PFM mode and 1 µA in stand-by mode), multiple and selectable, logic controlled shutdown states (true load disconnect or “bypass”, output connected to input), low noise and discontinuous current anti-ring control. 4,7 µH 3.3V U1 P1 1 SW 2 GND 3 EN VIN VOUT FB + VOUT _ GND P1 2.0V 6 5 4 VOUT SEL C2 10 µF MCP1640 SOT-23-6 1 C1 10 µF 2 1 EN Switch 1 2 L1 324 k 1 RT2 GND _ 1 536 k 1 RT1 + VIN RB1 309 k Note: Calculate RT resistors for a particular VOUT as: P1 S1 P1 RT = RB * ((VOUT / VFB) -1) S1 P1 VFB = 1.21V FIGURE 2-1: MCP1640 Synchronous Boost SOT-23-6 Application. Two enable mode options are available: true disconnect and bypass. When disabled, the true disconnect option removes the normal boost topology path from input to output by opening the diode path using a P-Channel synchronous switch with a reversible body diode. The bypass option uses the synchronous boost converter P-Channel switch to connect the input to the output through the boost inductor while disabled providing voltage to the load, while consuming less than 1 µA of current from VIN. The MCP1640 is available in SOT-23-6 and 2x3 mm DFN-8 lead packages. 2010 Microchip Technology Inc. DS51880A-page 11 MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide The MCP1640 Evaluation Board offers both package types in two boost-converter applications for 2.0V, 3.3V and 5.0V output voltage options that can be selected using a mini dip switch. The enable input is controlled in both boost converter applications using a mini dip switch. 2.2 FEATURES The MCP1640 Synchronous Boost Converter Evaluation Board has the following features: • It can be powered by one-cell, two-cell, or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries • Input voltage range, VIN: 0.35V to 5.5V, with VIN VOUT; 1 mA load after startup • Fixed output voltage: 2.0V or 3.3V and 3.3V or 5.0V, selected using a mini dip switch on board • Output current: typical 100 mA @ 3.3V Output, 1.2V Input or 300 mA @ 5.0V Output, 3.3V Input • Start-up voltage: 0.65V at VIN = 1.2V, VOUT = 3.3V and IOUT = 1mA, resistive load • Automatic PFM/PWM Operation • PWM Switching Frequency = 500 kHz • Enable state selectable using mini-dip switch on board • Peak Input Current Limit • Overtemperature (if the die temperature exceeds 150°C, 10°C hysteresis) 2.3 GETTING STARTED The MCP1640 Synchronous Boost Converter Evaluation Board is fully assembled and tested to evaluate and demonstrate the MCP1640 products. This board requires the use of external lab supplies and load. 2.3.1 Power Input and Output Connection 2.3.1.1 POWERING THE MCP1640 SYNCHRONOUS BOOST CONVERTER EVALUATION BOARD Soldered test points are available for input voltage connections. The maximum input voltage should not exceed 6.0V. The output voltage will not remain in regulation for input voltages that are greater than or equal to the output voltage. The MC1640 Synchronous Boost Converter Evaluation Board has two independent circuit applications, one using the MCP1640 SOT-23-6 package, while the other one uses the MCP1640 DFN-8 package. The SOT-23-6 package has two output voltage settings (2.0V and 3.3V) selectable by an on board mini-dip switch. The DFN-8 package has two output voltage settings (3.3V and 5.0V) also selectable by an on board mini-dip switch. Soldered test points are available to connect a load. The MCP1640 switch peak current limit will provide a safe maximum current value. The maximum output current for the MCP1640 will vary with input and output voltages; refer to the MCP1640 datasheet for more information on the maximum output current. As an example, the MCP1640 can typically supply a 3.3V load with 100 mA with a 1.2V input. DS51880A-page 12 2010 Microchip Technology Inc. Installation and Operation 2.3.1.2 BOARD POWER UP PROCEDURE: 1. Connect system load to VOUT and GND terminals, maximum load varies with input and output voltage; see the MCP1640 datasheet for more information on the maximum load. Typically, the MCP1640 can supply a 3.3V output with 100 mA from a 1.2V input source. Connect the (+) side of the load to VOUT and the negative (-) load to ground (GND). 2. Set the desired output voltage using the VOUT SEL mini dip switch. 3. Set the enable to the desired state using the EN mini dip switch. 4. When EN is set ON or high, the MCP1640 is enabled and VOUT can be measured on the VOUT and GND terminals. When EN is low, the MCP1640 is disabled and VOUT is floating and disconnected from the input. Capacitors C3, C4, C6 and C7 are not populated. The component pads are provided for experimental use. VOUT SEL switch between 2 and 3.3V A -meter A -meter FIGURE 2-2: 2.3.1.3 V -meter V -meter 1.2V Cell Resistive (min 33Ω/1W) MCP1640 Evaluation Board Setup. EN AND VOUT SEL SWITCHES FUNCTION TABLE 2-1: FUNCTION OF BOARD SWITCHES State of Switches SW3 or SW4 EN Switch VOUT [V] for SW1 or SW2 VOUT SEL Switch SOT-23-6 Converter 2x3 mm DFN Converter ON ON 2 3.3 ON OFF 3.3 5 OFF ON 0 0 OFF OFF 0 0 Note that SW2 (VOUT SEL) and SW4 (EN) are used for the SOT-23-6 circuit. Switches SW1 (VOUT SEL) and SW3 (EN) are used for the 2x3 mm DFN-8 circuit. 2010 Microchip Technology Inc. DS51880A-page 13 MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide 2.3.1.4 ADJUSTABLE VOUT SETTING The resistor divider RT and RB are used to set the converter output voltage. By setting the VOUT SEL switch in the open or OFF position, the output voltage can be calculated using the following equation: V OUT RT 1 = RB 1 ------------- – 1 V FB OR V OUT –1 RT 4 = RB 2 ----------- V FB- Where: VFB = 1.21V Note: DS51880A-page 14 The VOUT SELL switch will not be used. 2010 Microchip Technology Inc. MCP1640 SYNCHRONOUS BOOST CONVERTER EVALUATION BOARD USER’S GUIDE Appendix A. Schematic and Layouts A.1 INTRODUCTION This appendix contains the following schematics and layouts for the MCP1640 Synchronous Boost Converter Evaluation Board: • • • • Board – Schematic Board – Top Silk and Pads Board – Top Copper Layer Board – Bottom Copper Layer 2010 Microchip Technology Inc. DS51880A-page 15 MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide A.2 BOARD – SCHEMATIC DS51880A-page 16 2010 Microchip Technology Inc. Schematic and Layouts A.3 BOARD – TOP SILK AND PADS 2010 Microchip Technology Inc. DS51880A-page 17 MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide A.4 BOARD – TOP COPPER LAYER DS51880A-page 18 2010 Microchip Technology Inc. Schematic and Layouts A.5 BOARD – BOTTOM COPPER LAYER 2010 Microchip Technology Inc. DS51880A-page 19 MCP1640 Synchronous Boost Converter Evaluation Board User’s Guide NOTES: DS51880A-page 20 2010 Microchip Technology Inc. MCP1640 SYNCHRONOUS BOOST CONVERTER EVALUATION BOARD USER’S GUIDE Appendix B. Bill of Materials (BOM) TABLE B-1: Qty BILL OF MATERIALS (BOM) Reference Description Manufacturer Part Number 4 Bump BUMPON HEMISPHERE .44X.20 WHITE 3M SJ-5003 (WHITE) 3 C1, C2, C8 CAP CER 10UF 10V X7R 0805 Murata Electronics North America GRM21BR71A106KE51L 0 C3, C4, C6, C7 CAP TANT LOW ESR SMD 6032-EIA / C case 1 C5 CAP CER 10UF 10V X7R 1206 Murata Electronics North America GRM31CR71A106KA01L 2 L1, L2 INDUCTOR POWER 4.7UH 2.0A SMD EPCOS Inc B82462G4472M 1 PCB RoHS Compliant Bare PCB, MCP1640 Sync Boost Converter Evaluation Board Microchip Technology 104-00283 Inc. — — 2 RB1, RB2 RES 309K OHM 1/8W 1% 0805 SMD Rohm Semiconductor MCR10EZPF3093 1 RT1 RES 536K OHM 1/8W 1% 0805 SMD Yageo 1 RT2 RES 324K OHM 1/8W 1% 0805 SMD Rohm Semiconductor MCR10EZPF3243 1 RT4 RES 976K OHM 1/8W 1% 0805 SMD Rohm Semiconductor MCR10EZHF9763 1 RT5 RES 1.20M OHM 1/8W 1% 0805 SMD Rohm Semiconductor MCR10EZHF1204 4 SW1, SW2, SW3, SW4 SWITCH SLIDE SPDT SMD GULL Copal Electronics Inc CJS-1200TB 8 TP1, TP2, TP3, TP5, TP6, TP7, TP8, TP9 PC Test Point Compact SMT Keystone Electronics 5016 1 U1 MCP1640 Syncronous Boost Converter - SOT23-6 Microchip Technology MCP1640 Inc. 1 U2 MCP1640 Syncronous Boost Converter – DFN2x3mm Microchip Technology MCP1640 Inc. Note 1: RC0805FR-07536KL The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM used in manufacturing uses all RoHS-compliant components. 2010 Microchip Technology Inc. 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