Related Manuals for Microchip Technology MCP73871
Summary of Contents for Microchip Technology MCP73871
- Page 1 MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide © 2009 Microchip Technology Inc. DS51812B...
- Page 2 Endurance, TSHARC, UniWinDriver, 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.
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Page 3: Table Of Contents
Document Revision History ................... 3 Chapter 1. Product Overview 1.1 Introduction ..................... 5 1.2 What is the MCP73871 Demo Board with Voltage Proportional Current Control? ....................6 1.3 What the MCP73871 Demo Board with Voltage Proportional Current Control kit Includes? ....................6 Chapter 2. - Page 4 MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide NOTES: © 2009 Microchip Technology Inc. DS51812B-page 4...
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Page 5: Preface
• Customer Support • Document Revision History DOCUMENT LAYOUT This document describes how to use the MCP73871 Demo Board with Voltage Proportional Current Control as a linear Li-Ion battery charge controller that can share a load. The manual layout is as follows: •... -
Page 6: Conventions Used In This Guide
MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide CONVENTIONS USED IN THIS 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... -
Page 7: Recommended Reading
Preface RECOMMENDED READING This user's guide describes how to use MCP73871 Demo Board with Voltage Proportional Current Control. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources. • MCP73871 Data Sheet - “Stand-Alone System Load Sharing and Li-Ion / Li-Polymer Battery Charge Management Controller”, DS22090... -
Page 8: Document Revision History
MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide DOCUMENT REVISION HISTORY Revision B (November 2009) Initial Release of this Document. • Updated Section 2.2 “Features” with information on the Voltage Proportional Current Control Input Voltage. • Added footnote to Table 2-1. -
Page 9: Chapter 1. Product Overview
CURRENT CONTROL USER’S GUIDE Chapter 1. Product Overview INTRODUCTION The MCP73871 Demo Board with Voltage Proportional Current Control is designed to demonstrate Microchip's stand-alone linear Li-Ion battery charger with system power path and load sharing management control solution. The MCP73871 integrates the required elements to meet design challenges when developing new Li-Ion / Li-Polymer batteries powered products. -
Page 10: What Is The Mcp73871 Demo Board With Voltage Proportional Current Control
The MCP73871 Demo Board with Voltage Proportional Current Control is designed to cover all the features of the MCP73871 device. A thermistor can be added at test points TP6 and TP7, but resistor R6 must be removed (see the A.2 “Board – Schematic”). -
Page 11: Chapter 2. Installation And Operation
The system load is also powered by the Li-Ion battery when the input power is disconnected. A number of device options allow the MCP73871 to be utilized in a variety of applications. Please refer to the MCP73871 Data Sheet (DS22090) and/or contact local Microchip supports for additional device options. -
Page 12: Getting Started
MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide GETTING STARTED The MCP73871 Demo Board with Voltage Proportional Current Control is fully assembled and tested for charging a single-cell Li-Ion or Li-Polymer battery with or without system load. 2.3.1 Power Input and Output Connection 2.3.1.1... - Page 13 Installation and Operation 1000 Programming Resistor (kΩ) FIGURE 2-1: MCP73871 Charge Current (I ) vs. Programming Resistor PROG1 0V – 5V Meter Power Microchip Source Battery Volt Charge 5Ω Meter 100 μF Management Controller FIGURE 2-2: Simulated Battery Load. © 2009 Microchip Technology Inc.
- Page 14 MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide 5V DC Resistive Load Power Supply min 2A E-Load Battery or Battery Emulation Circuit FIGURE 2-3: MCP73871 Top Board and Application Circuit. TABLE 2-1: MCP73871 CHARGE STATUS OUTPUTS Charge Cycle State...
- Page 15 Therefore, if the system demands more current that the input can provide, the MCP73871 changes its status and the battery is able to supplement the input current to the system load.
- Page 16 An internal current source provides the bias for most common 10 kΩ negative-temperature coefficient thermistors (NTC). The MCP73871 device compares the voltage at the THERM pin to factory set thresholds of 1.24V and 0.25V, typically. Once a voltage outside the thresholds is detected during a charge cycle, the MCP73871 device immediately suspends the charge cycle, by turning off the charge and holding the timer value.
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Page 17: Appendix A. Schematic And Layouts
VOLTAGE PROPORTIONAL CURRENT CONTROL USER’S GUIDE Appendix A. Schematic and Layouts INTRODUCTION This appendix contains the following schematics and layouts for the MCP73871 Demo Board with Voltage Proportional Current Control: • Board – Schematic • Board – Top Silk and Pads •... -
Page 18: Board - Schematic
MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide BOARD – SCHEMATIC © 2009 Microchip Technology Inc. DS51812B-page 18... -
Page 19: Board - Top Silk And Pads
Schematic and Layouts BOARD – TOP SILK AND PADS © 2009 Microchip Technology Inc. DS51812B-page 19... -
Page 20: Board - Top Metal Layer
MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide BOARD – TOP METAL LAYER © 2009 Microchip Technology Inc. DS51812B-page 20... -
Page 21: Board - Bottom Layer
Schematic and Layouts BOARD – BOTTOM LAYER © 2009 Microchip Technology Inc. DS51812B-page 21... - Page 22 MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide NOTES: © 2009 Microchip Technology Inc. DS51812B-page 22...
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Page 23: Appendix B. Bill Of Materials (Bom)
Blue Water Clear 0603 SMD LED Para Light USA L-C191LBCT-U1 RoHS Compliant Bare PCB, Advanced Circuits 104-00244 MCP73871 Demo Board w/ Voltage Proportional Current Control ® R1, R3, R4, R5 RES 1K OHM 1/10W 1% 0603 SMD Panasonic - ECG... -
Page 24: Worldwide Sales And Service
Thailand - Bangkok Santa Clara, CA Tel: 86-29-8833-7252 Tel: 66-2-694-1351 Tel: 408-961-6444 Fax: 86-29-8833-7256 Fax: 66-2-694-1350 Fax: 408-961-6445 China - Zhuhai Toronto Tel: 86-756-3210040 Mississauga, Ontario, Fax: 86-756-3210049 Canada Tel: 905-673-0699 Fax: 905-673-6509 03/26/09 © 2009 Microchip Technology Inc. DS51812B-page 24... - Page 25 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Microchip MCP73871DM-VPCC...
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