Texas Instruments bq24278 User Manual
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Texas Instruments bq24278 User Manual

Texas Instruments bq24278 User Manual

Evaluation module
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The bq24278 evaluation module is a complete charger module for evaluating a compact, flexible, high-
efficiency, switch-mode charge management solution for single-cell, Li-ion and Li-polymer batteries used
in a wide range of portable applications.
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SLUU917 - April 2012
Submit Documentation Feedback
QFN-Packaged bq24278 Evaluation Module
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Copyright © 2012, Texas Instruments Incorporated
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List of Tables
QFN-Packaged bq24278 Evaluation Module
User's Guide
SLUU917 - April 2012
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Summary of Contents for Texas Instruments bq24278

  • Page 1: Table Of Contents

    SLUU917 – April 2012 QFN-Packaged bq24278 Evaluation Module The bq24278 evaluation module is a complete charger module for evaluating a compact, flexible, high- efficiency, switch-mode charge management solution for single-cell, Li-ion and Li-polymer batteries used in a wide range of portable applications.

  • Page 2: Introduction

    For details, see the bq24278 data sheet (SLUSB04). bq24278 EVM Features The bq24278 evaluation module (EVM) is a complete charger module for evaluating compact, flexible, high-efficiency, switch-mode battery charge and power path management solution for single-cell, Li-ion and Li-polymer battery-powered systems used in a wide range of portable applications. Key EVM features include: •...

  • Page 3: Schematic

    Introduction www.ti.com Schematic Figure 1. bq24278EVM (HPA759) Schematic SLUU917 – April 2012 QFN-Packaged bq24278 Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 4: I/O Description

    Test Point Description Kelvin to IN Kelvin to SYS Kelvin to BAT DRV_S TP10 DRV_S TP11 ISET TP12 ILIM TP13 TP14 TP15 TP16 QFN-Packaged bq24278 Evaluation Module SLUU917 – April 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 5: Control And Key Parameters Setting

    Maximum input current limit for ac adapter input (set by IN(MAX) user-selectable resistor) Max fast charge current, Battery charge current 0.550 CHRG(MAX) Operating junction temperature range, T °C SLUU917 – April 2012 QFN-Packaged bq24278 Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 6: Test Summary

    Testing with an actual battery is the best way to verify operation in the system. If a battery is unavailable, then a circuit similar to the one shown in Figure 2 can simulate a battery when connected to a second power supply. QFN-Packaged bq24278 Evaluation Module SLUU917 – April 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 7: Recommended Test Equipment Setup

    8. Ensure jumpers are at the default factory settings per Section 1.6. 9. After the preceding steps are accomplished, the test setup for HPA759 is as shown in Figure 3 SLUU917 – April 2012 QFN-Packaged bq24278 Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 8: Recommended Test Procedure

    CHRG í VM#4 Figure 3. Original Test Setup for bq24278 EVM (HPA759) Recommended Test Procedure The following test procedure may be useful for evaluating the charger IC outside of a real system, if no battery is available to connect to the output and a simulated battery is needed.
  • Page 9 INDPM 3. Observe battery supplement mode by applying a resistive load across SYS and GND that is higher than the maximum charge current. SLUU917 – April 2012 QFN-Packaged bq24278 Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 10: Printed-Circuit Board Layout Guideline

    7. For high-current applications, the balls for the power paths must be connected to as much copper in the board as possible. This allows better thermal performance because the board conducts heat away from the IC. QFN-Packaged bq24278 Evaluation Module SLUU917 – April 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 11: Bill Of Materials And Board Layout

    5000 Keystone TP1, 5000 Test point, red, thru hole color keyed 0.100 × 0.100 in 5000 Keystone TP2, TP3, TP7, TP8, TP15, TP16 SLUU917 – April 2012 QFN-Packaged bq24278 Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 12: Board Layout

    Shunt, 100 mil, black 0.100 929950-00 – PCB 3.00 in × 3.00 in × 0.062 in HPA759 Board Layout Figure 4. Top Assembly Layer QFN-Packaged bq24278 Evaluation Module SLUU917 – April 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 13: Top Layer

    Bill of Materials and Board Layout www.ti.com Figure 5. Top Layer Figure 6. Bottom Layer SLUU917 – April 2012 QFN-Packaged bq24278 Evaluation Module Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 14: First Internal Layer

    Bill of Materials and Board Layout www.ti.com Figure 7. First Internal Layer Figure 8. Second Internal Layer QFN-Packaged bq24278 Evaluation Module SLUU917 – April 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...

  • Page 15: Regulatory Compliance Information

    Any exceptions to this are strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization.
  • Page 16 FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
  • Page 17 Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan. Texas Instruments Japan Limited (address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan http://www.tij.co.jp...
  • Page 18 FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate Assurance and Indemnity Agreement. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2012, Texas Instruments Incorporated...
  • Page 19 Any exceptions to this are strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization.
  • Page 20 FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
  • Page 21 Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan. Texas Instruments Japan Limited (address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan http://www.tij.co.jp...
  • Page 22 FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate Assurance and Indemnity Agreement. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2012, Texas Instruments Incorporated...

  • Page 23: Important Notice

    IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue.

  • Page 24: Texas Instruments

    Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments BQ24278EVM-759...

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