MCP1603 Tiny Reference Design © 2008 Microchip Technology Inc. DS51750A 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 relief 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in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates.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 WARRANTIES 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 devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, rfPIC, SmartShunt and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, Linear Active Thermistor, MXDEV, MXLAB, 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, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM, PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total Endurance, WiperLock and ZENA 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. © 2008, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. 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. DS51750A-page ii © 2008 Microchip Technology Inc. MCP1603 TINY REFERENCE DESIGN Table of Contents Preface ........................................................................................................................... 1 Chapter 1. Product Overview 1.1 Introduction ..................................................................................................... 5 1.2 What is the MCP1603 Tiny Reference Design Board? .................................. 6 1.3 What the MCP1603 Tiny Reference Design Board Kit Includes? .................. 6 Chapter 2. Installation and Operation 2.1 Introduction ..................................................................................................... 7 2.2 Features ......................................................................................................... 7 2.3 Getting Started ............................................................................................... 7 2.3.1 Power Input and Output Connection ........................................................... 7 Appendix A. Schematics and Layouts A.1 Introduction and Highlights ............................................................................ 9 A.2 Board - Schematic ....................................................................................... 10 A.3 Board - Top Pads and Silk-Screen .............................................................. 11 A.4 Board - Top Pads and Trace ........................................................................ 11 A.5 Board - Bottom Trace ................................................................................... 11 Appendix B. Bill of Materials (BOM) Worldwide Sales and Service .................................................................................... 14 © 2008 Microchip Technology Inc. DS51750A-page iii MCP1603 Tiny Reference Design DS51750A-page iv © 2008 Microchip Technology Inc. MCP1603 TINY REFERENCE DESIGN 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 MCP1603 Tiny Reference Design. 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 MCP1603 Tiny Reference Design as a development tool to emulate and debug firmware on a target board. The manual layout is as follows: • Chapter 1. “Product Overview” – Important information about the MCP1603 Tiny Reference Design • Chapter 2. “Installation and Operation” – Includes instructions on how to get started with this reference design board and a description of the reference design board operation. • Appendix A. “Schematics and Layouts” – Shows the schematic and layout diagrams for the MCP1603 Tiny Reference Design. • Appendix B. “Bill of Materials (BOM)” - Lists the parts used to build the MCP1603 Tiny Reference Design. © 2008 Microchip Technology Inc. DS51750A-page 1 MCP1603 Tiny Reference Design CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Arial font: Italic characters 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 #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} 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 code supplied by user DS51750A-page 2 Examples File>Save Press <Enter>, <F1> var_name [, var_name...] void main (void) { ... } © 2008 Microchip Technology Inc. Preface RECOMMENDED READING This user's guide describes how to use MCP1603 Tiny Reference Design. Other useful documents are listed below. The following Microchip document is available and recommended as supplemental reference resources: • MCP1603 Data Sheet, “2.0 MHz, 500 mA Synchronous Buck Regulator”, DS22042 • AN793 - “Power Management in Portable Applications: Understanding the Buck Switchmode Power Converter”, DS00793 • MCP1603 Buck Converter Evaluation Board User's Guide, DS51652 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 DOCUMENT REVISION HISTORY Revision A (October 2008) • Initial Release of this Document. © 2008 Microchip Technology Inc. DS51750A-page 3 MCP1603 Tiny Reference Design NOTES: DS51750A-page 4 © 2008 Microchip Technology Inc. MCP1603 TINY REFERENCE DESIGN Chapter 1. Product Overview 1.1 INTRODUCTION Step-down converter choices include a variety of linear and switching regulators. The MCP1603 500 mA synchronous buck regulator provides a low profile, cost effective, and efficient solution for devices like cellular telephones, USB-powered devices and hand held instruments. The device provides a solution with minimal board space because of the high-frequency operation, which reduces the size requirements of the external inductor and capacitor and the 1 mm maximum height TSOT package. The MCP1603 switches at a fixed frequency of 2.0 MHz when operating at a heavy load. This provides a low-noise, small size solution. When operating at light loads, the MCP1603 automatically changes operation to a pulse frequency modulation (PFM) mode to minimize quiescent current drawn from the input source. No intervention is necessary for smooth transition from one mode to another. This chapter covers the following topics: • What is the MCP1603 Tiny Reference Design? • What the MCP1603 Tiny Reference Design Kit includes? Input Voltage 2.7V - 5.5V FIGURE 1-1: © 2008 Microchip Technology Inc. MCP1603 Buck Regulator ±VOUT 500 mA (maximum) MCP1603 Tiny Reference Design Block Diagram. DS51750A-page 5 MCP1603 Tiny Reference Design 1.2 WHAT IS THE MCP1603 TINY REFERENCE DESIGN BOARD? The MCP1603 Tiny Reference Design demonstrates the use of Microchip's MCP1603 device in a step-down application. The evaluation board is a fully functional platform to evaluate the MCP1603 buck regulator over the input voltage, output voltage and current range of the device. The evaluation board is designed to show off one of the main advantages of MCP1603 - its small size. Test points are provided to allow easy connection of the input voltage source and the output load. FIGURE 1-2: 1.3 MCP1603 Tiny Reference Design Board Size. WHAT THE MCP1603 TINY REFERENCE DESIGN BOARD KIT INCLUDES? This MCP1603 Tiny Reference Design kit includes: • Three separate MCP1603 Tiny Reference Design boards with the following output voltage options: - Fixed 3.3V using the MCP1603T-330I/OS - Fixed 1.8V using the MCP1603T-180I/OS - Fixed 1.2V using the MCP1603T-120I/OS • Analog and Interface Products Demonstration Boards CD-ROM - MCP1603 Tiny Reference Design (DS51750) DS51750A-page 6 © 2008 Microchip Technology Inc. MCP1603 TINY REFERENCE DESIGN Chapter 2. Installation and Operation 2.1 INTRODUCTION The MCP1603 Tiny Reference Design is designed to demonstrate Microchip's MCP1603 in a fixed output voltage configuration. The board is designed to demonstrate how to generate both positive and negative rails using the MCP1603. The MCP1603 is a 500 mA synchronous buck regulator that features both Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM). The PFM mode is used at light loads to improve system efficiency while the 2.0 MHz PWM mode is entered at heavy loads. The transition between PFM and PWM modes automatically occurs without any external intervention. The MCP1603 is available in both adjustable parts that require an external divider to set the output voltage and fixed output voltage parts. The high switching speed and TSOT package (1 mm maximum height) make the MCP1603 ideal for space constrained applications that require an efficient stepped down voltage. 2.2 FEATURES The MCP1603 Tiny Reference Design has the following features: • Ultra compact size and low profile 500 mA converter design • Wide Input voltage range from 2.7V to 5.5V • Fixed output voltages: 3.3V, 1.2V, 1.8V as well as -1.2V and -1.8V (from 3.3V supply) • Test points for connecting input voltage source and external load 2.3 GETTING STARTED The MCP1603 Tiny Reference Design is fully assembled and tested for evaluating the MCP1603 device. The board requires the use of an external input voltage source of 2.7V to 5.5V and an external load capable of 500 mA. 2.3.1 Power Input and Output Connection Powering the MCP1603 Tiny Reference Design (Positive Output Voltage Configuration) 1. Connect the positive side of the input source (+) to VIN. 2. Connect the negative or return side (-) of input source to GND. Refer to Figure 2-1. The input voltage must be within the range of 2.7V to 5.5V. © 2008 Microchip Technology Inc. DS51750A-page 7 MCP1603 Tiny Reference Design 2.7V - 5.5V + VOUT – FIGURE 2-1: Positive Output Voltage Setup Configuration Diagram. Powering the MCP1603 Tiny Reference Design (Negative Output Configuration 1. Connect the positive side of the input source (+) to VIN. 2. Connect the negative or return side (-) of input source to VOUT. Refer to Figure 2-2. In this configuration the output voltage will appear between the VOUT terminal and GND terminal of the board. Note: For negative voltage generation the following condition must be met: VIN-VOUT < 5.5V. For example, if generating -1.2V output, VIN-(-1.2V) < 5.5V, therefore, VIN < 4.3V. The MCP1603 device will be able to provide full load current in this configuration. VIN _ VOUT (Negative) + FIGURE 2-2: Negative Output Voltage Setup Configuration Diagram. Applying Load to MCP1603 Tiny Reference Design Board (Positive Output Configuration) 1. Connect the positive side of the load (+) to VOUT. 2. Connect the negative side of the load (-) to GND. Refer to Figure 2-1 and Figure 2-2. The maximum load current should not exceed 500 mA. As an alternative, a resistor can be connected between GND and VOUT. The value of this resistor must be sized such that the maximum load current does not exceed 500 mA for the selected output voltage. DS51750A-page 8 © 2008 Microchip Technology Inc. MCP1603 TINY REFERENCE DESIGN Appendix A. Schematics and Layouts A.1 INTRODUCTION AND HIGHLIGHTS This appendix contains the following schematics and layouts for the MCP1603 Tiny Reference Design: • • • • Board - Schematic Board - Top Silk Layer Board - Top Metal Layer Board - Bottom Metal Layer © 2008 Microchip Technology Inc. DS51750A-page 9 DS51750A-page 10 A B 1 Gnd TP2 Vin TP1 AGND 1 2 3 MCP1603 Vin Gnd SHDN U1 Vfb Lx 4 6 4.7uH, 740mA L1 3 2 3 AGND C2 10uF, 6.3V (C) Gnd TP3 Vout TP4 Author: Alex Irkliy MCP1603.sch MCP1603 Tiny Reference Design Board AGND C1 10uF, 6.3V (C) 2 4 Rev 1.0 4 A B C D A.2 C D 1 MCP1603 Tiny Reference Design BOARD - SCHEMATIC © 2008 Microchip Technology Inc. Schematics and Layouts A.3 BOARD - TOP PADS AND SILK-SCREEN A.4 BOARD - TOP PADS AND TRACE A.5 BOARD - BOTTOM TRACE © 2008 Microchip Technology Inc. DS51750A-page 11 MCP1603 Tiny Reference Design NOTES: DS51750A-page 12 © 2008 Microchip Technology Inc. MCP1603 TINY REFERENCE DESIGN BOARD Appendix B. Bill of Materials (BOM) TABLE B-1: Qty 2 BILL OF MATERIALS (BOM) Designator C1, C2 Description Manufacturer Part Number 10uF, 6.3V, 0603 Ceramic Capacitor Panasonic® - ECG ECJ-1VB0J106M TDK Corporation VLF3012AT-4R7MR74 1 L1 4.7uH, 740mA Inductor 1 PCB RoHS Compliant Bare PCB, MCP1603 Microchip Technology Inc. Tiny Reference Design Board 104-00220 4 TP1, TP2, TP3, TP4 PC Test Point Compact SMT Keystone Electronics® 5016 1 U1 500 mA Synchronous Buck Regulator in SOT23-5 Package Microchip Technology Inc. MCP1603T-120I/OS 1 U1 500 mA Synchronous Buck Regulator in SOT23-5 Package Microchip Technology Inc. MCP1603T-180I/OS 1 U1 500 mA Synchronous Buck Regulator in SOT23-5 Package Microchip Technology Inc. MCP1603T-330I/OS Note 1: 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. © 2008 Microchip Technology Inc. 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