Texas Instruments bq24725 User Manual
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Texas Instruments bq24725 User Manual

Texas Instruments bq24725 User Manual

Evaluation module
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This user's guide describes the features and operation of the bq24725EVM Evaluation Module (EVM).
This EVM assists users in evaluation the bq24725 synchronous battery charger. The manual includes the
bq24725EVM bill of materials, board layout, and schematic.
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Introduction

1.1
EVM Features
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Evaluation module for bq24725
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High-efficiency NMOS-NMOS synchronous buck charger with 750-kHz frequency
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High-efficiency and low-cost NMOS power path selector and integrated gate driver
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User-selectable 2-cell, 3-cell, or 4-cell Li-ion battery voltage
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Programmable battery voltage, charge current, and ac adapter current via SMBus interface
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Flexible Chargeoption() register control via SMBus interface
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AC adapter operating range 9 V - 24 V
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Test points for key signals available for testing. Easy probe hook-up
Windows is a trademark of Microsoft Corporation.
SLUU439A - August 2010 - Revised May 2011
Submit Documentation Feedback
This datasheet has been downloaded from
bq24725EVM Evaluation Module
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Copyright © 2010-2011, Texas Instruments Incorporated
SLUU439A - August 2010 - Revised May 2011
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http://www.digchip.com
User's Guide
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Summary of Contents for Texas Instruments bq24725

  • Page 1: Table Of Contents

    Evaluation Module This user's guide describes the features and operation of the bq24725EVM Evaluation Module (EVM). This EVM assists users in evaluation the bq24725 synchronous battery charger. The manual includes the bq24725EVM bill of materials, board layout, and schematic.
  • Page 2 The bq24725EVM evaluation module (also referred to as HPA-542) is a complete charger module for evaluating a multicell synchronous notebook charge using the bq24725 devices. It is designed to deliver up to 4 A of charge current to Li-ion or Li-polymer applications.

  • Page 3: Test Summary

    The current meters must be capable of measuring 5-A+ current. 2.2.5 Computer A computer with at least one USB port and a USB cable. The EV2300 USB driver and the bq24725 SMB evaluation software must be properly installed. 2.2.6 EV2300 SMBUS Communication Kit An EV2300 SMBUS communication kit SLUU439A –...

  • Page 4: Connections Of The Ev2300 Kit

    (or other directory). Double-click on the "setup.exe" file. Follow the installation steps. 2. "bq24725EVMSetup.zip" (SLUC202): This is the bq24725 SMB evaluation software. Save and unzip to c:\temp (or other directory). Double-click on the “SETUP.EXE” file. Follow the installation steps. This software needs to be installed after the EV2300 USB driver.

  • Page 5: Original Test Setup For Hpa-542 (Bq24725 Evm)

    DCIN Figure 2. Original Test Setup for HPA-542 (bq24725 EVM) 11. Turn on the computer. Open the bq24725 evaluation software. The main window of the software is shown in Figure Figure 3. Main Window of the bq24725 Evaluation Software SLUU439A –...
  • Page 6 Disconnect any uncertain SMBus connections. Plug in the USB cable into the original EVM2300 installation USB port. • Open the bq24725 evaluation software. The main window of the software is shown in Figure 3. Type in "512" (mA) in the Charge Current DAC, and click the Write button. This sets the battery charge current regulation threshold.

  • Page 7: Pcb Layout Guideline

    The following is a printed-circuit board (PCB) layout priority list for proper layout. Laying out a PCB according to this specific order is essential. SLUU439A – August 2010 – Revised May 2011 bq24725EVM Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated...

  • Page 8: Bill Of Materials, Board Layouts And Schematics

    Terminal Block, 3-pin, 6-A, 3.5mm 0.41 x 0.25 inch ED555/3DS PEC02SAAN Header, Male 2-pin, 100mil spacing, 0.100 inch x 2 PEC02SAAN Sullins SLUU439A – August 2010 – Revised May 2011 bq24725EVM Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated...
  • Page 9 IC, SMBus charge controller with NMOS bq24725RGR selector – Label 1.25 x 0.25 inch THT-13-457-10 Brady – HPA542 2.5x2.5inch 4 layer 2oz. PCB 2.5x2.5inch SLUU439A – August 2010 – Revised May 2011 bq24725EVM Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated...

  • Page 10: Top Layer

    Bill of Materials, Board Layouts and Schematics www.ti.com Board Layouts Figure 5. Top Layer Figure 6. Second Layer SLUU439A – August 2010 – Revised May 2011 bq24725EVM Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated...

  • Page 11: Third Layer

    Bill of Materials, Board Layouts and Schematics www.ti.com Figure 7. Third Layer Figure 8. Bottom Layer SLUU439A – August 2010 – Revised May 2011 bq24725EVM Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated...

  • Page 12: Top Mask

    Bill of Materials, Board Layouts and Schematics www.ti.com Figure 9. Top Mask Figure 10. Bottom Mask SLUU439A – August 2010 – Revised May 2011 bq24725EVM Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated...

  • Page 13: Top Silkscreen

    Bill of Materials, Board Layouts and Schematics www.ti.com Figure 11. Top Silkscreen Figure 12. Bottom Silkscreen SLUU439A – August 2010 – Revised May 2011 bq24725EVM Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated...

  • Page 14: Top Assembly

    Bill of Materials, Board Layouts and Schematics www.ti.com Figure 13. Top Assembly Figure 14. Bottom Assembly Schematics The schematic is shown on the following page. SLUU439A – August 2010 – Revised May 2011 bq24725EVM Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated...
  • Page 15 Bill of Materials, Board Layouts and Schematics www.ti.com SLUU439A – August 2010 – Revised May 2011 bq24725EVM Evaluation Module Submit Documentation Feedback Copyright © 2010–2011, Texas Instruments Incorporated...
  • Page 16 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 17 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.

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