M MCP1601 Evaluation Board User’s Guide 2003 Microchip Technology Inc. DS51315A 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. Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. 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 otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, KEELOQ, MPLAB, PIC, PICmicro, PICSTART, PRO MATE and PowerSmart are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Accuron, dsPIC, dsPICDEM.net, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, PICC, PICkit, PICDEM, PICDEM.net, PowerCal, PowerInfo, PowerTool, rfPIC, Select Mode, SmartSensor, SmartShunt, SmartTel and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. Serialized Quick Turn Programming (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. © 2003, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company’s quality system processes and procedures are QS-9000 compliant for its PICmicro ® 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001 certified. DS51315A - page ii 2003 Microchip Technology Inc. M MCP1601 Eval. Board User Guide Table of Contents General Information .................................................................................. 1 Introduction And Highlights.................................................................. 1 About This Guide..................................................................................1 The Microchip Internet Web Site...........................................................2 Customer Support.................................................................................2 Chapter 1. MCP1601 Evaluation Board ...............................................3 1.1 Introduction ................................................................................ 3 1.2 Detailed Description .................................................................. 4 1.3 Test Points ................................................................................ 6 Appendix A. Schematic and Board Layouts ......................................... 7 A.1 Introduction................................................................................ 7 A.2 Evaluation Board Schematic ................................................... 8 A.3 Evaluation Board - Silk Screen Layer ...................................... 8 A.4 Evaluation Board - Top Metal Layer ........................................ 9 A.5 Evaluation Board - Bottom Metal Layer ................................... 9 Appendix B. Bill Of Materials (BOM).................................................... 11 2002 Microchip Technology Inc. DS51315A-page iii MCP1601 Eval. Board User Guide NOTES: DS51315A-page iv 2002 Microchip Technology Inc. M MCP1601 Eval. Board User Guide General Information INTRODUCTION AND HIGHLIGHTS This section contains general information that will be useful to know before using the MCP1601 Evaluation Board. This section covers the following topics: • • • • About this Guide Recommended Reading The Microchip Internet Web Site Customer Support ABOUT THIS GUIDE Document Layout This document describes how to use the MCP1601 Evaluation Board. The User’s Guide layout is as follows: • Chapter 1: MCP1601 Evaluation Board - For user’s evaluating the MCP1601 device, this section describes how to use the various features of the board. Appendices • Appendix A: Schematic and Board Layout – shows the schematic and Printed Circuit Board (PCB) layout diagrams for the MCP1601 Evaluation Board. - Appendix A.1 gives some overview and highlight information. - Appendix A.2 contains the Evaluation Board Schematic - Appendix A.3 shows the Silk Screen Layer of the PCB. - Appendix A.4 shows the Silk Screen and Top Metal Layer of the PCB. - Appendix A.5 shows the Silk Screen and Bottom Metal layer of the PCB. • Appendix B: Bill of Materials – Table B-1 shows the Bill of Materials (BOM) for the PCB. • Worldwide Sales and Service – gives the address, telephone and fax number for Microchip Technology Inc. sales and service locations throughout the world. Recommended Reading For more information regarding the MCP1601 device, the following is recommended reading: MCP1601 Data Sheet (DS21762) This data sheet provides detailed information regarding the MCP1601 500 mA Synchronous BUCK Regulator. The data sheet is available for download from our World Wide Web Site (www.microchip.com) or from the Technical Library CD-ROM (DS00161). 2003 Microchip Technology Inc. DS51315A-page 1 MCP1601 Eval. Board User Guide THE MICROCHIP INTERNET WEB SITE Microchip provides easy access to our documentation and on-line support through our World Wide Web Site at www.microchip.com. You can download files from the web site or from our FTP site at ftp://ftp.microchip.com CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels: • • • • • Distributor or Representative Local Sales Office Field Application Engineer (FAE) Corporate Applications Engineer (CAE) Hot line Customers should call their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. See the back cover for a listing of sales offices and locations. Corporate Applications Engineers (CAEs) may be contacted at (480) 792-7627. In addition, there is a Systems Information and Upgrade Line. This line provides system users a listing of the latest versions of all of Microchip's development systems software products. Plus, this line provides information on how customers can receive any currently available upgrade kits. The Hot Line Numbers are: • 1-800-755-2345 for U.S. and most of Canada, and • 1-480-792-7302 for the rest of the world DS51315A-page 2 2003 Microchip Technology Inc. M MCP1601 Eval. Board User Guide Chapter 1. MCP1601 Evaluation Board 1.1 INTRODUCTION The MCP1601 Evaluation Board is designed to demonstrate the use of the MCP1601 Synchronous BUCK Regulator in a step down, inductor-based DC/DC converter application. It also describes the capability of the MCP1601 Evaluation Board and how to select the desired Synchronous Converter operating mode and program the output voltage. The Evaluation Board Schematic is shown is Figure 1-1. Input Output TP1 TP2 +VIN 1 C1 +V OUT U1 2 2 10 µF 3 1 TP3 LX VIN SHDN PGND TP5 7 10 µH 2 R1 1 AGND C3 2 R5 2 R6 2 1.0 MΩ 1 AGND 2003 Microchip Technology Inc. 1 U2 1 1 2 2 SYNC/PWM 1.0 MΩ FIGURE 1-1: PGND 619 KΩ ON 4 3 ON TP6 ON 4 3 ON 2 pos Switch TP4 634 KΩ 2 R3 1 1 1 2 2 10 µF 1 2 R2 1 47 pF U3 2 C2 1.24 MΩ VOUT SYNC/ 5 PWM FB MCP1601 /SHDN L1 6 4 AGND Pgnd 8 TP7 AGND R4 1200 KΩ 1 AGND 2 pos Switch 2 AGND AGND MCP1601 Evaluation Board Schematic. DS51315A-page 3 MCP1601 Eval. Board User Guide 1.2 DETAILED DESCRIPTION The MCP1601 is a 500 mA Synchronous BUCK Regulator. Both the high-side BUCK P-Channel and the low-side N-Channel switches are integrated within the device. The integrated synchronous switch makes the MCP1601 very efficient, even when converting unregulated input voltages to low voltage fixed outputs. This evaluation board is designed for a wide range of output voltages and currents. For specific applications, smaller inductors, shielded inductors, tantalum capacitors and different output voltage settings can improve the total DC/DC converter performance and cost. The MCP1601 device can operate in three different modes of operation to optimize the efficiency of the voltage conversion. The three operating modes are: • Automatic switching from PFM Mode to PWM mode and back • Synchronization to external Oscillator • Fixed Frequency Forced PWM Mode The MCP1601 output voltage is adjustable and is set by two external divider resistors. A two-position switch is used on the MCP1601 Evaluation Board to change the resistance of the external divider and adjust the output voltage to four different settings. These output voltage settings are: 1.8V, 2.05V, 2.45V and 3.28V. 1.2.1 Applying Power to the Board Two surface mount test points are used to apply power to the MCP1601 Evaluation Board. For proper operation, the input voltage range is 2.7V < +VIN < +5.5V for all operating conditions. The MCP1601 has an internal Under-Voltage Lockout (UVLO) which will prevent the board from operating when the input voltage is below the specified 2.7V minimum. 1. Connect the positive side of the external power supply (+) to the +VIN test point. 2. Connect the negative side (GND) of the external power supply to the PGND test point which is located directly below the +VIN test point. 1.2.2 Connecting a Load to the Board To connect an external load to the board, the +VOUT and PGND test points are used. • Connect the positive side of the load to the +VOUT pin and the negative or ground side of the load to the PGND test point located directly under the +VOUT test point. The MCP1601 output is rated for 500 mA (maximum) continuous current. The output is protected against over current and short circuit conditions. 1.2.3 Enabling the MCP1601 - Using Switch U3, Position 1 Switch U 3, position 1 is used to determine the SHDN mode for the MCP1601 device. With switch U3, position 1 pushed to the right, the SHDN pin is pulled up and the output of the MCP1601 device is enabled. When switch U 3, position 1 is to the left, the MCP1601 device is in a low quiescent current SHDN mode and the output is disabled. DS51315A-page 4 2003 Microchip Technology Inc. MCP1601 Evaluation Board 1.2.4 Selecting the Operating Mode - Using Switch U3, Position 2 The multi-function SYNC/PWM pin on the MCP1601 is used to set the operating mode of the device. The three operating modes are: • Automatic switching from PFM Mode to PWM mode and back • Synchronization to external Oscillator • Fixed Frequency Forced PWM Mode To select automatic PFM/PWM mode: • Slide switch U3, position 2 to the left or off position. While operating in this mode, the MCP1601 device will automatically select the most efficient operating mode by approximating the load current internally. To synchronize the MCP1601 switching frequency to an external oscillator: • Slide switch U3, position 2 to the left. Connect the external oscillator to the SYNC/PWM test point located directly below switch U3 and the AGND test point. See the MCP1601 datasheet (DS21762) for external clock specifications. When synchronizing to an external oscillator, the MCP1601 will operate in the fixed frequency mode at the same frequency as the external oscillator. To select fixed frequency mode that operates off of the 750 kHz internal oscillator: • Slide switch U3, position 2 to the right or “on” position. This will tie the SYNC/PWM pin high and force PWM operation from the internal oscillator, making the MCP1601 device independent of external load conditions. 1.2.5 Selecting the MCP1601 output voltage Switch U2 is used to select the output voltage. Refer to Table 1-1 to choose one of the pre-selected output voltages. TABLE 1-1: SWITCH SETTINGS FOR PRE-SELECTED OUTPUT VOLTAGES U2, Position 1 U2, Position 2 VOUT OFF OFF ON ON OFF ON OFF ON 3.28V 2.45V 2.05V 1.8 The output voltage for the MCP1601 device is determined by using the following formula. EQUATION R V OUT = V REF 1 + ------2- R4 Where: VREF = 0.8V Typical R4 = 200 kΩ for the Evaluation board R2 is set by the parallel combination of R 1, R2 and R3. 2003 Microchip Technology Inc. DS51315A-page 5 MCP1601 Eval. Board User Guide 1.3 TEST POINTS 1.3.1 /SHDN The /SHDN or shutdown test point can be used to monitor the level of the shutdown pin or as an input to the shutdown pin of the MCP1601 device. With switch U3, position 1 in the “off” position, a 1 MΩ resistor will pull the pin low. 1.3.2 SYNC/PWM The SYNC/PWM pin can be used to monitor the level of the SYNC/PWM pin or as an input to the MCP1601 device. With switch U 3, position 2 in the “off” position, a 1 MΩ resistor will pull the pin low. To synchronize to an external oscillator: • With switch U3, position 2 in the off position, connect the external oscillator to the SYNC/PWM test point. 1.3.3 A GND The analog ground or AGND can be used as a quiet ground connection. When using the external oscillator synchronization function, connect the return or ground of the external oscillator to the AGND test point. DS51315A-page 6 2003 Microchip Technology Inc. M MCP1601 Eval. Board User Guide Appendix A. Schematic and Board Layouts A.1 INTRODUCTION This appendix contains the schematic and board layout diagrams for the MCP1601 Evaluation Board. A.1.1 Highlights The MCP1601 Evaluation Board is constructed using one (1) silk screen layer and two (2) 1 oz. metal wiring layers. The bottom metal wiring layer is a single ground plane which is routed to partition the PGND high current return pin from the small signal AGND return pin on the MCP1601 device. Diagrams included in this appendix: • • • • Evaluation Board Schematic Evaluation Board - Top Silk Screen Layer Evaluation Board - Top Metal Layer Evaluation Board - Bottom Metal Layer 2003 Microchip Technology Inc. DS51315A-page 7 MCP1601 Eval. Board User Guide A.2 EVALUATION BOARD SCHEMATIC Input Output TP1 TP2 +VIN 1 C1 +V OUT U1 2 2 10 µF 3 1 TP3 VIN LX SHDN PGND 7 2 R1 1 10 µH AGND 2 R2 1 C3 2 PGND R3 619 KΩ 1 U2 1 1 2 2 ON 4 3 ON TP6 SYNC/PWM R5 2 R6 2 1.0 MΩ 1.0 MΩ 1 AGND A.3 TP4 634 KΩ 2 47 pF ON 4 3 ON 2 pos Switch 10 µF 1 1 U3 1 1 2 2 2 C2 1.24 MΩ VOUT SYNC/ 5 PWM FB MCP1601 /SHDN L1 6 4 AGND TP5 Pgnd 8 TP7 AGND R4 1200 KΩ 1 AGND 2 pos Switch 2 AGND AGND EVALUATION BOARD - SILK SCREEN LAYER DS51315A-page 8 2003 Microchip Technology Inc. MCP1601 Evaluation Board A.4 EVALUATION BOARD - TOP METAL LAYER A.5 EVALUATION BOARD - BOTTOM METAL LAYER 2003 Microchip Technology Inc. DS51315A-page 9 MCP1601 Eval. Board User Guide NOTES: DS51315A-page 10 2003 Microchip Technology Inc. M MCP1601 Eval. Board User Guide Appendix B. Bill Of Materials (BOM) TABLE B-1: Reference Designator BILL OF MATERIALS (BOM) Qty Description Manufacturer Manufacturer Part Number 9C08052A1224FKHFT R1 1 Resistor 1.24 MΩ 1/8W 1% 0805 SMD Yageo® R2 1 Resistor 634 kΩ 1/10W 1% 0805 SMD Panasonic® ECG ERJ-6ENF6343V R3 1 Resistor 619 kΩ 1/10W 1% 0805 SMD Panasonic® ECG ERJ-6ENF6193V R4 1 Resistor 200 kΩ 1/10W 1% 0805 SMD Panasonic® ECG ERJ-6ENF200V R5,R6 2 Resistor 1.00 MΩ 1/10W 1% 0805 SMD Panasonic® ECG ERJ-6ENF1004V C1, C2 2 Capacitor 10 µF, 6.3V Ceramic X5R 1206 SMD C3 1 Capacitor 47 pF, 50V Ceramic 0805 SMD L1 1 10 µH Coilcraft Wafer Inductor U1 1 Microchip Synchronous BUCK Regulator U2, U3 2 DIP Switches, 2-Position, SPST TP1 - TP7 7 Test Points 4 Bumpons - Protective Products 2003 Microchip Technology Inc. Kemet® C1206C106K9PACT Panasonic® ECG ECJ-2VC1H470J Coilcraft® LPO2506IB-103 Microchip MCP1601 Technology Inc. C&K® Keystone® 3M® TDA02H0SK1 5016 SJ5003-0 DS51315A-page 11 M WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC Corporate Office Australia 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com Microchip Technology Australia Pty Ltd Suite 22, 41 Rawson Street Epping 2121, NSW Australia Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 Rocky Mountain China - Beijing 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-4338 Atlanta 3780 Mansell Road, Suite 130 Alpharetta, GA 30022 Tel: 770-640-0034 Fax: 770-640-0307 Boston 2 Lan Drive, Suite 120 Westford, MA 01886 Tel: 978-692-3848 Fax: 978-692-3821 Chicago 333 Pierce Road, Suite 180 Itasca, IL 60143 Tel: 630-285-0071 Fax: 630-285-0075 Dallas 4570 Westgrove Drive, Suite 160 Addison, TX 75001 Tel: 972-818-7423 Fax: 972-818-2924 Detroit Tri-Atria Office Building 32255 Northwestern Highway, Suite 190 Farmington Hills, MI 48334 Tel: 248-538-2250 Fax: 248-538-2260 Kokomo 2767 S. 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Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 United Kingdom Microchip Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 12/05/02 DS51315A-page 12 2003 Microchip Technology Inc.