Microchip Technology MCP73833 User’s Guide

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MCP73833

Li-Ion Battery Charger

Evaluation Board

User’s Guide

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8-bit MCUs, KEELOQ

code hopping devices, Serial

MCP73833 LI-ION 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........................................................................................ 3

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

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

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

Chapter 1. Product Overview ....................................................................................... 5

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

1.2 What is the MCP73833 Li-Ion Battery Charger Evaluation Board? ................ 6

1.3 What the MCP73833 Evaluation Kit Includes ................................................. 6

Chapter 2. Installation and Operation ......................................................................... 7

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

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

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

Appendix A. Schematic and Layouts ........................................................................ 11

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

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

A.3 Board - Top Overlay ................................................................................... 13

A.4 Board - Top Layer ...................................................................................... 14

A.5 Board - Bottom Layer ................................................................................. 15

Appendix B. Bill Of Materials (BOM) ......................................................................... 17

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

MCP73833 Li-Ion Battery Charger Evaluation Board User’s Guide

NOTES:

MCP73833 LI-ION 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 MCP73833 Li-Ion 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 MCP73833 Li-Ion Battery Charger Evaluation Board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP73833

Li-Ion Battery Charger Evaluation Board.

• Chapter 2. “Installation and Operation” – Includes instructions on how to get

started with this evaluation kit and a description of the evaluation boards.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout

diagrams for the MCP73833 Li-Ion Battery Charger Evaluation Board.

• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the

MCP73833 Li-Ion Battery Charger Evaluation Board.

MCP73833 Li-Ion 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

N‘Rnnnn A number in verilog format,

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

Courier New font:

Plain Courier New Sample source code #define START

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

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

where N is the total number of digits, R is the radix and n is a digit.

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

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[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

• 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

Preface

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

• Development Systems Information Line

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 (September 2006)

• Initial Release of this Document.

MCP73833 Li-Ion Battery Charger Evaluation Board User’s Guide

NOTES:

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP73833 Li-Ion Battery Charger Evaluation Board is used to evaluate Microchip Technology’s MCP73833/4 in simple, stand-alone Li-Ion battery charging applications. Two circuit layouts are provided for evaluation of various device options in either the DFN or MSOP package.

This chapter covers the following topics:

• What is the MCP73833 Li-Ion Battery Charger Evaluation Board?

• What the MCP73833 Evaluation Kit Includes

MCP73833 LI-ION BATTERY

CHARGER EVALUATION BOARD

USER’S GUIDE

1A Li-Ion Battery Charger

1,2

1µF

470Ω

STAT1

STAT2

MCP73833

FIGURE 1-1: Typical MCP73833 Application.

BAT

THERM

PROG

9,10

1µF

1kΩ

Single Li-Ion

Cell

10 kΩT

MCP73833 Li-Ion Battery Charger Evaluation Board User’s Guide

1.2 WHAT IS THE MCP73833 LI-ION BATTERY CHARGER EVALUATION

BOARD?

The MCP73833 Li-Ion Battery Charger Evaluation Board is an evaluation and demonstration tool for Microchip’s MCP73833/4 Stand-Alone Linear Li-Ion/Li-Polymer Charge Management Controllers.

The evaluation board has two circuits provided with one circuit fully assembled and tested. Each circuit is set up to evaluate simple, stand-alone, linear charging of single cell Li-Ion / Li-Polymer battery packs (the battery packs are not included). The circuits can be evaluated independently. Each circuit design provides constant current charging followed by constant voltage charging with automatic charge termination and battery temperature monitoring. In addition, the assembled MCP73833/4-FC circuit provides preconditioning of deeply depleted cells.

Each board design provides evaluation of the MCP73833/4 in two package options: a MSOP-10 (not assembled) and a 3mm x 3mm, 10-Lead DFN (assembled) for higher power handling capability.

When connected, this evaluation board allows for the evaluation of the MCP73833/4 devices in a variety of applications.

1.3 WHAT THE MCP73833 EVALUATION KIT INCLUDES

This MCP73833 Li-Ion Battery Charger Evaluation Board Kit includes:

• MCP73833 Li-Ion Battery Charger Evaluation Board, 102-00117

• Analog and Interface Products Demonstration Boards CD-ROM, (DS21912)

- MCP73833 Li-Ion Battery Charger Evaluation Board User’s Guide, (DS51526)

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP73833 Li-Ion Battery Charger Evaluation Board demonstrates Microchip Technology’s MCP73833/4 devices. The MCP73833/4 is a Stand-Alone Linear Li-Ion/Li-Polymer Charge Management Controller. A number of device options allow the MCP73833/4 to be utilized in a variety of applications. Refer to the MCP73833/4 data sheet (DS22005) for device options.

2.2 FEATURES

The MCP73833 Li-Ion Battery Charger Evaluation Board contains two evaluation circuits for evaluation of various device options. The board has the following features with the factory installed device (MCP73833-FCI/MF):

• Charge Voltage: 4.20V

• Programmable Fast Charge Current up to 1000 mA

• Preconditioning of deeply depleted cells

- Preconditioning Threshold Voltage: 3.0V

- Preconditioning Current: 10% of Programmed Fast Charge Current

• Automatic Charge Termination

- Charge termination by minimum current in Constant Voltage Mode

- Charge termination by safety time period: 6 hours

- Termination Current: 7.5% of Programmed Fast Charge Current

• Automatic Recharge

- Recharge Threshold Voltage: 4.05V

• Cell Temperature Monitoring

• Charge Current Monitor for Fuel Guaging

• Thermal Regulation

• Reverse Discharge Protection

• Evaluation in 3mm x 3mm, 10-Lead DFN Package for higher power handling

capability

• Simple Stand-Alone Operation

• Powered from external bench supply or voltage regulated wall cube

• Surface-Mount Design

• One Circuit Fully Assembled and Tested

MCP73833 LI-ION BATTERY

CHARGER EVALUATION BOARD

USER’S GUIDE

MCP73833 Li-Ion Battery Charger Evaluation Board User’s Guide

R1 1

TP 5

TP 3

TP 1

D4 R9

TP 6

R3 R7

TP 4U1

TP 2

TP 7

C3 C4

R1 0

R1 2 R1 3

R1 4

TP 8U2

C1 C2

D1 R2

2.3 GETTING STARTED

The MCP73833 Li-Ion Battery Charger Evaluation Board has one circuit fully assembled and tested for charging single cell, Li-Ion/Li-Polymer battery packs. The board provides the appropriate charge algorithm for simple, stand-alone operation.

The board requires the use of an external input voltage source (5V ±10%, recommended) and external load (battery pack or simulated battery load).

2.3.1 Power Input and Output Connections

2.3.1.1 POWERING THE MCP73833 LI-ION BATTERY CHARGER EVALUATION BOARD

1. Apply the input voltage source to the appropriate circuit for evaluation. The input

voltage source should be limited to the 0V to +6V range. For normal operation, the input voltage should be between +4.5V and +6V. The input voltage must not exceed an absolute maximum of +7V.

2. Connect the positive side of the input source (+) to VDD of the circuit being

evaluated. Connect the negative or return side of the input source (-) to VSS of the circuit being evaluated. Refer to Figure 2-1.

Battery Pack

Input Power Supply

FIGURE 2-1: Setup Configuration Diagram.

2.3.1.2 APPLYING THE LOAD TO THE MCP73833 LI-ION BATTERY CHARGER

1. To apply a load to the MCP73833 Li-Ion Battery Charger Evaluation Board, the

_ +

EVALUATION BOARD

positive side of the load (B+) should be connected to VBAT of the circuit being evaluated. The negative or return side of the load (B-) should be connected to

or Simulated

Battery Load

VSS of the circuit being evaluated. Care should be taken when using electronic loads or ground referenced loads.

2. For the MCP73833-FCI/MF installed device, the charge management controller

will only provide 10% of the programmed fast charge current if the battery terminal voltage (VBAT) is less than 3.0V with respect to VSS. Using a purely resistive

Installation and Operation

load will not work for preconditioning and fast charge currents. The best way to evaluate the charge management circuit is to use a single cell Li-Ion battery pack, or the recommended simulated battery load. Refer to Figure 2-2.

B+

Var iable Power Supply 0V - 6V

B-

1,000 µF

10V Al

5Ω

10 W

FIGURE 2-2: Simulated Battery Load.

2.3.1.3 SETTING THE FAST CHARGE CURRENT

1. As provided, the MCP73833 Li-Ion Battery Charger Evaluation Board has a fast charge current setting of 1A for the installed device.

2. Alternatively, for the installed device, resistors R5 and R6 can be changed in order to obtain the desired fast charge current. In addition, the PROG via can be interfaced to obtain two current settings or to utilize the PROG device enable feature. Refer to the MCP73833/4 data sheet for choosing the appropriate value programming resistor for the desired fast charge current.

2.3.1.4 STATUS INDICATORS

1. The MCP73833 Li-Ion Battery Charger Evaluation Board has three LED status indicators for each circuit being evaluated. Tab le 2- 1 represents the state of the status indicators during various states of the charge cycle. ON indicates that the respective LED is illuminated.

TABLE 2-1: STATUS INDICATORS

CHARGE CYCLE STATE STAT1 (RED) STAT2 (GREEN) PG (GREEN)

Shutdown OFF OFF OFF

Standby OFF OFF ON

Charge in Progress ON OFF ON

Charge Complete (EOC) OFF ON ON

Temperature Fault OFF OFF ON

Timer Fault OFF OFF ON

System Test Mode ON ON ON

2.3.1.5 BATTERY TEMPERATURE MONITOR

1. As provided, the installed circuit of the MCP73833 Li-Ion Battery Charger Evaluation Board has the battery temperature monitor disabled. To invoke battery temperature monitoring, an appropriate thermistor should be connected between the THERM via and VSS via. In addition, resistors R2 and R7 should be changed in order to obtain the desired charge inhibit window. Refer to the MCP73833/4 data sheet for choosing the appropriate resistor values.charge current monitor for each circuit being evaluated.

MCP73833 Li-Ion Battery Charger Evaluation Board User’s Guide

2.3.1.6 DEVICE SUPPORT OPTIONS

1. The MCP73833 Li-Ion Battery Charger Evaluation Board is capable of supporting all of the available MCP73833/4 device options. The factory installed device is the MCP73833-FCI/MF. Refer to the MCP73833/4 data sheet for available device options and details regarding the installed device options.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematic and layouts for the MCP73833 Li-Ion Battery Charger Evaluation Board.

Diagrams included in this appendix:

• Board Schematic

• Board - Top Overlay

• Board - Top Layer

• Board - Bottom Layer

MCP73833 LI-ION BATTERY

CHARGER EVALUATION BOARD

USER’S GUIDE

MCP73833 Li-Ion Battery Charger Evaluation Board User’s Guide

AKAK

A.2 BOARD SCHEMATIC

A.3 BOARD - TOP OVERLAY

Schematic and Layouts

TP 1

C1 C2

TP 3

D1 R2

R3 R7

TP 5

C3 C4

TP 7

D4 R9

R1 0

R1 2 R1 3

R1 1

TP 2

TP 4U1

TP 6

TP 8U2

R1 4

MCP73833 Li-Ion Battery Charger Evaluation Board User’s Guide

A.4 BOARD - TOP LAYER

A.5 BOARD - BOTTOM LAYER

Schematic and Layouts

MCP73833 Li-Ion Battery Charger Evaluation Board User’s Guide

NOTES:

MCP73833 LI-ION BATTERY

CHARGER EVALUATION BOARD

USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty. Reference Description Mfgr. Part Number

2 C1,C2 4.7uF, X7R Ceramic, 10V, 0805 Taiyo Yuden 1 D1 Super Red LED, 0603 Lumex 2 D2,D3 Green LED, 0603 Lumex LTST-C190KGKT 3 R1,R3,R4 221, 1/10W, Chip Resistor, 0603 Panasonic 1 R2 1.54k, 1/10W, Chip Resistor, 0603 Panasonic-ECG ERJ-3EKF1541V 1 R5 0, 1/10W, Chip Resistor, 0603 Panasonic-ECG ERJ-3GEY0R00V 1 R6 1.00k, 1/10W, Chip Resistor, 0603 Panasonic-ECG ERJ-3EKF1001V 1 R7 10.0k, 1/10W, Chip Resistor, 0603 Panasonic-ECG ERJ-3EKF1002V 4 TP1-TP4 Surface Mount Test Point, 5016 Keystone Electronics 1 U1 1A Fully Integrated Charger,

3X3DFN10 4 Bump-ons 3M™ SJ5003 1 Printed Circuit Board Advanced Circuits 104-00117-R1 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.

Microchip Technology Inc.

-ECG ERJ-3EKF2210V

LMK212BJ475KG-TR LTST-C190KRKT

5016 MCP73833-FCI/MF

WORLDWIDE SALES AND SERVICE

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Corporate Office

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08/29/06

Microchip Technology MCP73833 User’s 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

1.3 WHAT THE MCP73833 EVALUATION 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

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE