Microchip Technology MCP73X23 Lithium Iron Phosphate (LiFePO4) Battery Charger Evaluation Board User guide

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MCP73X23

Lithium Iron Phosphate (LiFePO4)

Battery Charger

Evaluation Board

User’s Guide

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MCUs and dsPIC® DSCs, KEELOQ

code hopping

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............................................................................2

Recommended Reading........................................................................................2

The Microchip Web Site........................................................................................3

Customer Support.................................................................................................3

Document Revision History...................................................................................3

Chapter 1. Product Overview

1.1 Introduction .....................................................................................................5

1.2 What is the MCP73X23 Lithium Iron Phosphate Battery Battery Charger

Evaluation Board? .................................................................................... 6

1.3 What the MCP73X23 Lithium Iron Phosphate Battery Battery Charger

Evaluation Board Kit Includes: ..................................................................6

Chapter 2. Installation and Operation

2.1 Introduction .....................................................................................................7

2.2 Features .........................................................................................................7

2.3 Getting Started ...............................................................................................8

Appendix A. Schematic and Layouts

A.1 Introduction .................................................................................................. 11

A.2 Board – Schematic .......................................................................................12

A.3 Board – Assembly Drawing ..........................................................................13

A.4 Board – Top Layer ....................................................................................... 14

A.5 Board – Top Metal Layer .............................................................................15

A.6 Board – Bottom Layer .................................................................................16

Appendix B. Bill Of Materials (BOM)

Worldwide Sales and Service .................................................................................... 18

MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide

NOTES:

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. 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 Select the Help menu, and then Topics to open a list of available on-line help files.

IDE on-line help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the MCP73X23 Lithium Iron Phosphate Battery Charger 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 MCP73X2 3 Lith iu m Ir on Phos ph a te Ba ttery Charger Evaluation Board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP73X23 Lithium Iron Phosphate Battery Charger 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 MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board.

• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board.

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 Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

‘bnnnn A binary number where n is a

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier font:

Plain Courier Sample source code #define START

Italic Courier A variable argument file.o, where file can be

0xnnnn A hexadecimal number where

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces repeated text var_name [,

A menu path File>Save

A tab Click the Power tab

digit

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1

n is a hexadecimal digit

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

‘b00100, ‘b10

any valid filename

0xFFFF, 0x007A

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

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

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• Technical Support

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Customers should contact their distributor, representative or field application engineer (FAE) for support. Lo cal 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

Preface

DOCUMENT REVISION HISTORY

Revision A (July 2009)

• Initial Release of this Document.

MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide

NOTES:

Chapter 1. Product Overview

STAT

PROG

REGULATED WALL CUBE

LiFePO

Battery

LED

BAT

OUT

PROG

MCP73123

1.1 INTRODUCTION

The MCP73123/223 product family is highly integrated linear charge management controllers for lithium iron phosphate (LiFePO family operates with minimum external components, which is ideal for use in space-limited and cost-effective applications. The maximum 18V rated input over voltage protection and battery short circuit protection offer designers a secondary protection in addition to the Li-Ion battery protection circuit.

This chapter provides an overview of the MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Boardand covers the following topics:

• “What is the MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board?”

• “What the MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board Kit Includes”

MCP73X23 LITHIUM IRON PHOSPHATE

BATTERY CHARGER EVALUATION

BOARD USER’S GUIDE

) batteries. The MCP73123/223 product

FIGURE 1-1: MCP73123 Typical Application.

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 Phos-

phate (LiFePO

Protection”.

The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Boa rd is designed with two independent circuits. The MCP73123 is designed to charge a single -cell LiFePO circuits offer two different fast charging currents. The default value of fast charging current is 500 mA and when PROG via is tie to ground, the two parallel resistors output 1000 mA fast charging current to a battery pack. One blue LED status output allows user to learn if the MCP73123/223 is in charging state or not.

The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board comes with installed MCP73123 and MCP73223 devices in 3 mm x 3 mm DFN packages. The factory preset battery regulation voltage is 3.6V for the MCP73123 and 7.2V for the MCP73223 with 10% precondition current, 10% termination current set point, automatic recharge and 6.5V over voltage protection threshold voltage.

The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Boa rd is designed to observe the performance and features of Microchip’s MCP73123 and MCP73223. Circuits can also be implemented into suitable applications without extra work.

battery, while the MCP73223 charges a dual-cell LiFePO4 battery. Both

Note: Please refer to Table 2-2 for Charge S t atu s Output s and Table 2-1 for Fast

) Battery Charge Management Controller with Input Overvoltage

Charge Current vs. Resistor Lookup Table.

1.3 WHAT THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD KIT INCLUDES

The MCP73X23 Lithium Iron Phosphate Ba ttery Charger Evaluation Board kit in cludes:

• MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board, 1 02-00262

• Important Information Sheet.

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. Along with its small physical size, the low number of external components makes the MCP73123/223 ideally suitable for low-cost and small-capacity (less than 2000 mAh) LiFePO applications. It will take longer time to complete a charge cycle for larger capacity LiFePO

The absolute maximum voltage, up to 18V over voltage protection, allows the use of MCP73123/223 in harsh environments, such as low cost ac-dc adapter.

The MCP73123/223 employs a constant current / constant voltage (CC-CV) charge algorithm and 3.6V per cell voltage regulation s. The fast charge, constant current value is set with one external resistor from 130 mA to 1100 mA. The MCP73123/223 also limits the charge current based on die temperature during high power or high ambi ent conditions. This thermal regulation optimizes the charge cycle time while maintaining device reliability.

The PROG pin of the MCP73123/223 also serves as enable pin. When high imp edance (typ. 200 kΩ) is applied, the MCP73123/223 will be in standby mode.

Typical applications for the reference design are T oys, Power Tools, Uninterrupt Power Supply, Backup Power Storage and applications in wider temperature range than typical Li-Ion batteries.

MCP73X23 LITHIUM IRON PHOSPHATE

BATTERY CHARGER EVALUATION

BOARD USER’S GUIDE

battery

battery packs.

2.2 FEATURES

The MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board has the following features:

• Input Over Voltage Protection:

• Charge Regulation Voltage:

• 10% Preconditioning of Deeply Depleted Cells

• 32-Minute Preconditioning Timer

• 6-Hour Safety Timer

• 10% Automatic Charge Termination

• 500 mA and 1000 mA Preset Fast Charge Current

• Automatic Recharge

• Thermal Regulation

• One Blue LED Charge Status Indicator For Each Circuit

• Pre-installed MCP73123 and MCP73223 Devices

- 6.5V for the MCP73123,

- 13V for the MCP73223

- 3.6V for the MCP73123,

- 7.2V for the MCP73223

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 LiFePO

2.3.1 Power Input and Output Connection

2.3.1.1 POWERING THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD

batteries.

1. Connect the positive battery terminal to V

BAT-

2. Connect the DC power supply Negative Terminal to V

3. Connect the DC power supply Positive Terminal to V

and negative battery terminal to

BAT+

4. It should initiate the battery charging cycle when the power sou rce is present and

is below recharge threshold. For example, When V

BAT

is 3.6V , V

REG

BAT

needs

to be lower than 3.42V to initiate the charge cycle.

Note 1: The MCP73123 circuit is designed to charge one-cell LiFePO

and the MCP73223 circuit is designed to charge two-cell LiFePO

battery

battery.

2: The LiFePO

battery can be replaced with test circuit or electronic load

that can sink current with DC power supply. Refer to Figure 2-3.

5. The charging status table is available on Table 2-2.

6. The fast charge current is preset at 500 mA and can be increased to 1A by

connecting PROG via to ground.

Note: Fast Charge Current can be programmed with various resistors based on

Figure 2-2 and Table 2-2.

FIGURE 2-1: Board Top Assembly.

Installation and Operation

100

200

300

400

500

600

700

800

900

1000

1100

1200

1 2 3 4 5 6 7 8 9 1011121314151617181920

Programming Resistor (Ω)

Charge Current (mA)

VDD = 5.2V T

= +25°C

FIGURE 2-2: MCP73123/223 Charge Curr ent (I (R

TABLE 2-1: MCP73123/223 RESISTOR LOOKUP TABLE

PROG

Charge Current (mA)

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 3.30k 400 3.00k 3.00k 450 2.61k 2.70k 500 2.32k 2.37k 550 2.10k 2.20k 600 1.91k 2.00k 650 1.78k 1.80k 700 1.62k 1.60k 750 1.50k 1.50k 800 1.40k 1.50k 850 1.33k 1.30k 900 1.24k 1.20k

950 1.18k 1.20k 1000 1.10k 1.10k 1 100 1.00k 1.00k

Recommended E96 Resistor

(Ω)

) vs. Programming Resistor

OUT

Recommended E24 Resistor

(Ω)

MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide

Power

Source

Volt

Meter

5Ω

10W

Microchip

Battery

Charge

Management

Controller

Amp Meter

BAT+

BAT-

GND

1000 µF

FIGURE 2-3: Simulated Battery Load for MCP73123/223.

TABLE 2-2: 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 1.6 second 50% D.C. Flashing (Type 1)

Hi-Z (Type 2)

Timer Fault 1.6 second 50% D.C. Flashing (Type 1)

Hi-Z (Type 2)

Preconditioning Timer Fault 1.6 second 50% D.C. Flashing (Type 1)

Hi-Z (Type 2)

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

MCP73X23 LITHIUM IRON PHOSPHATE

BATTERY CHARGER EVALUATION

BOARD USER’S GUIDE

MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide

A.2 BOARD – SCHEMATIC

A.3 BOARD – TOP LAYER

Schematic and Layouts

MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide

A.4 BOARD – TOP METAL LAYER

A.5 BOARD – BOTTOM LAYER

Schematic and Layouts

MCP73X23 Lithium Iron Phosphate Battery Charger Evaluation Board User’s Guide

NOTES:

MCP73X23 LITHIUM IRON PHOSPHATE

BATTERY CHARGER EVALUATION

BOARD USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS

Qty Reference Description Manufacturer Part Number

4 Bump BUMPON HEMISPHERE .44X.20 WHITE 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 4 R1, R3, R4, R5 RES 2.37K OHM 1/10W 1% 0603 SMD Panasonic 2 R2, R6 RES 1K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1001V 8 TP1, TP2, TP3,

TP4, TP5, TP6, TP7, TP8

1 U1 Single-Cell Lithium Iron Phosphate Battery

1 U2 Dual-Cell Lithium Iron Phosphate Battery

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.

PC Test Point Compact SMT Keystone Electronics

Charger with OVP

Microchip Technology Inc. 104-00262

- ECG ERJ-3EKF2371V

5016

Microchip Technology Inc. MCP73123-22S/MF

Microchip Technology Inc. MCP73223-C2S/MF

WORLDWIDE SALES AND SERVICE

AMERICAS

Corporate Office

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03/26/09

Microchip Technology MCP73X23 Lithium Iron Phosphate (LiFePO4) Battery Charger Evaluation Board User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

INTRODUCTION

DOCUMENT LAYOUT

CONVENTIONS USED IN THIS GUIDE

RECOMMENDED READING

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

DOCUMENT REVISION HISTORY

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 WHAT IS THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD?

1.3 WHAT THE MCP73X23 LITHIUM IRON PHOSPHATE BATTERY CHARGER EVALUATION BOARD KIT INCLUDES

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 FEATURES

2.3 GETTING STARTED

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

A.2 BOARD – SCHEMATIC

A.3 BOARD – TOP LAYER

A.4 BOARD – TOP METAL LAYER

A.5 BOARD – BOTTOM LAYER

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE