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User's Guide

SLUU377–September 2009

0.8-A Single-Input, Single-Cell Li-Ion Battery Charger

This user’s guide describes the bq24040 evaluation module (EVM), how to perform a stand-alone

evaluation or interface with a host or system. The charger is designed to deliver up to 800mA of

continuous current to the battery output when programmed with a resistor on the ISET pin and is

programmed at the factory for ~540mA. The USB current limit modes are selected by the ISET2 pin and

limits current to a maximum of 500mA (logic high) or 100mA (float or high impedance). A low on the

ISET2 pin programs the charge current using the ISET resistor.

Contents

1 Introduction .................................................................................................................. 2

2 Considerations With Evaluating the bq24040/1 ......................................................................... 2

3 Performance Specification Summary ..................................................................................... 2

4 Test Summary ............................................................................................................... 2

4.1 Equipment ........................................................................................................... 3

4.2 Equipment and EVM Setup ....................................................................................... 3

4.3 Test Procedure Using a Single Cell Li-Ion Battery ............................................................ 4

4.4 Alternate Test Methods ........................................................................................... 4

5 Schematic, Physical Layouts and Bill of Materials ..................................................................... 4

5.1 Schematic ........................................................................................................... 5

5.2 Physical Layouts ................................................................................................... 6

5.3 Bill of Materials ..................................................................................................... 8

List of Figures

1 EVM Setup................................................................................................................... 3

2 bq24040/41 EVM Board Schematic ...................................................................................... 5

3 Assembly Layer ............................................................................................................. 6

4 Top Layer .................................................................................................................... 7

5 Bottom Layer ................................................................................................................ 7

SLUU377–September 2009 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger

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Summary of content (10 pages)

PAGE 1
User's Guide SLUU377 – September 2009 0.8-A Single-Input, Single-Cell Li-Ion Battery Charger This user’s guide describes the bq24040 evaluation module (EVM), how to perform a stand-alone evaluation or interface with a host or system. The charger is designed to deliver up to 800mA of continuous current to the battery output when programmed with a resistor on the ISET pin and is programmed at the factory for ~540mA.
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Introduction 1 www.ti.com Introduction The bq2404x series of devices are highly integrated Li-ion linear charger devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The bq2404x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer.
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Test Summary www.ti.com 4.1 Equipment • • • • 4.2 Power supply +5.1 ±0.1 V, current limit set to 1.5 ±0.1 A Battery: 4.2 V LiCoO2 or equivalent Three Fluke 75 DMMs (equivalent or better) Oscilloscope, Model TDS220 (equivalent or better) Equipment and EVM Setup Jack/Component Connect or Adjustment To: J1–DC+ Power supply positive, preset to 5 VDC, 1-A current limit.
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Schematic, Physical Layouts and Bill of Materials 4.3 www.ti.com Test Procedure Using a Single Cell Li-Ion Battery 1. Verify that the setup is correct and turn on the power supply, which was preset to 5 VDC, and 1 A for the current-limit setting. 2. The bq24040/1 enters preconditioning mode if the battery is below the V(LOWV) threshold.
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www.ti.com 5.1 Schematic, Physical Layouts and Bill of Materials Schematic Figure 2. bq24040/41 EVM Board Schematic SLUU377 – September 2009 Submit Documentation Feedback 0.
PAGE 6
Schematic, Physical Layouts and Bill of Materials 5.2 www.ti.com Physical Layouts Figure 3. Assembly Layer Figure 4. Top Layer 6 0.
PAGE 7
Schematic, Physical Layouts and Bill of Materials www.ti.com Figure 5. Bottom Layer SLUU377 – September 2009 Submit Documentation Feedback 0.
PAGE 8
Schematic, Physical Layouts and Bill of Materials 5.3 www.ti.
PAGE 9
Important Notices EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
PAGE 10
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.