MCP73X23 Lithium Iron Phosphate (LiFePO4) Battery Charger Evaluation Board User’s Guide © 2009 Microchip Technology Inc.
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MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD USER’S GUIDE Table of Contents Preface ........................................................................................................................... 1 Introduction............................................................................................................ 1 Document Layout .................................................................................................. 1 Conventions Used in this Guide ...........
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide NOTES: DS51850A-page iv © 2009 Microchip Technology Inc.
MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER 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.
MCP73X23 Lithium Iron Phosphate Battery Charger 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 ‘bnnnn Text in angle brackets < > Courier font: Plain Courier Italic Courier 0xnnnn Square brackets [ ] Curly brackets and pipe character: { | } Ellipses...
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MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide NOTES: DS51850A-page 4 © 2009 Microchip Technology Inc.
MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD USER’S GUIDE Chapter 1. Product Overview 1.1 INTRODUCTION The MCP73123/223 product family is highly integrated linear charge management controllers for lithium iron phosphate (LiFePO4) batteries. The MCP73123/223 product family operates with minimum external components, which is ideal for use in space-limited and cost-effective applications.
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide 1.2 WHAT IS THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD? The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board demonstrates the features of Microchip’s MCP73123 and MCP73223 “Lithium Iron Phosphate (LiFePO4) Battery Charge Management Controller with Input Overvoltage Protection”. The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board is designed with two independent circuits.
MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD USER’S GUIDE Chapter 2. Installation and Operation 2.1 INTRODUCTION The MCP73123/223 is a highly integrated Li-Ion battery charge management controller for use in space-limited and cost-sensitive applications. The MCP73123/223 provides specific charge algorithms for Lithium Iron Phosphate batteries to achieve optimal capacity and safety in the shortest charging time possible.
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide 2.3 GETTING STARTED The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board is fully assembled and tested for charging LiFePO4 batteries. 2.3.1 Power Input and Output Connection 2.3.1.1 POWERING THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD 1. Connect the positive battery terminal to VBAT+ and negative battery terminal to VBAT-. 2. Connect the DC power supply Negative Terminal to VSS. 3.
Charge Current (mA) Installation and Operation 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 VDD = 5.2V TA = +25°C 1 1 2 3 4 5 6 7 8 9 1011121314151617181920 Programming Resistor (Ω) FIGURE 2-2: (RPROG). TABLE 2-1: MCP73123/223 Charge Current (IOUT) vs. Programming Resistor MCP73123/223 RESISTOR LOOKUP TABLE Charge Current (mA) Recommended E96 Resistor (Ω) Recommended E24 Resistor (Ω) 130 10k 10k 150 8.45k 8.20k 200 6.20k 6.20k 250 4.99k 5.10k 300 4.02k 3.90k 350 3.40k 3.
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide Amp Meter DC Power Source Volt Meter R 5Ω 10W 1000 µF Microchip Battery Charge Management Controller VBAT+ VBAT- GND FIGURE 2-3: 1 Simulated Battery Load for MCP73123/223. TABLE 2-2: DS51850A-page 10 MCP73123/223 CHARGE STATUS OUTPUTS CHARGE CYCLE STATE STAT Shutdown Hi-Z Standby Hi-Z Preconditioning L Constant Current Fast Charge L Constant Voltage L Charge Complete - Standby Hi-Z Temperature Fault 1.
MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD USER’S GUIDE Appendix A. Schematic and Layouts A.1 INTRODUCTION This appendix contains the following schematics and layouts for the MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board: • • • • Board – Schematic Board – Top Layer Board – Top Metal Layer Board – Bottom Layer © 2009 Microchip Technology Inc.
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide BOARD – SCHEMATIC M A.2 DS51850A-page 12 © 2009 Microchip Technology Inc.
Schematic and Layouts A.3 BOARD – TOP LAYER © 2009 Microchip Technology Inc.
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide A.4 BOARD – TOP METAL LAYER DS51850A-page 14 © 2009 Microchip Technology Inc.
Schematic and Layouts A.5 BOARD – BOTTOM LAYER © 2009 Microchip Technology Inc.
MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide NOTES: DS51850A-page 16 © 2009 Microchip Technology Inc.
MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD USER’S GUIDE Appendix B. Bill Of Materials (BOM) TABLE B-1: Qty BILL OF MATERIALS Reference Description Part Number 4 Bump 3M SJ5003-9-ND 4 C1, C2, C3, C4 CAP CERAMIC 4.7 µF 25V X5R 1206 TDK C2012X5R1E475M 2 D1, D2 Blue Water Clear 0603 SMD LED Para Light USA L-C191LBCT-U1 1 PCB RoHS Compliant Bare PCB, MCP73X23 Evaluation Board Microchip Technology Inc. 104-00262 4 R1, R3, R4, R5 RES 2.
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