Texas Instruments bq24070 User Manual
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Texas Instruments bq24070 User Manual

Texas Instruments bq24070 User Manual

1.5-a single-chip li-ion and li-pol charge management ic evm
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bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge
This user's guide describes the bq24070 evaluation module (EVM). The EVM provides
a convenient method for evaluating the performance of a charge management and
system power solution for portable applications using the bq24070 product family. A
completly designed and tested module is presented. The charger is designed to deliver
up to 1.5 A of continuous current to the system or charger for one-cell Li-ion or
Li-polymer applications using a dc power supply. The charger is programmed from the
factory to deliver 1 A of charging current.
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Bill of Materials
SLUU248 - May 2006
Submit Documentation Feedback
Contents
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bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM
User's Guide
SLUU248 - May 2006
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Summary of Contents for Texas Instruments bq24070

  • Page 1: Table Of Contents

    1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM This user’s guide describes the bq24070 evaluation module (EVM). The EVM provides a convenient method for evaluating the performance of a charge management and system power solution for portable applications using the bq24070 product family. A completly designed and tested module is presented.

  • Page 2: Introduction

    (a drop to the battery voltage). Considerations When Testing and Using bq24070 ICs It is recommended to read the bq24070 data sheet prior to evaluating this EVM. Consider the following noteworthy items while testing and using the bq24070 IC.

  • Page 3: Performance Specification Summary

    – to 30 5.25 VDC Li-Ion, Single-Cell, 1- to 2- A h Capacity × BAT+ (DC–) BAT– – B0136-01 Figure 1. Test Diagram SLUU248 – May 2006 bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM Submit Documentation Feedback...
  • Page 4 If the battery voltage is higher, the battery supplements the current to keep the output from dropping too much (20 mV to 200 mV) below the battery voltage. bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM SLUU248 – May 2006 Submit Documentation Feedback...
  • Page 5 28. If a load is applied across the battery such that the battery is discharged to ~4.1 V, the charger starts a new charging cycle. This concludes the evaluation of the bq24070 EVM. Several more features implemented in the IC are not demonstrated in this user's guide. See the data sheet to learn more about thermal regulation, thermal cutoff, USB boot up, and short-circuit protection.

  • Page 6: Schematic

    Schematic Schematic Figure 2. bq24070 EVM Schematic bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM SLUU248 – May 2006 Submit Documentation Feedback...

  • Page 7: Physical Layouts

    EVM. Figure 8 shows the bottom etch layer of the EVM. 2.30 1.79 K001 Figure 3. Top Assembly View SLUU248 – May 2006 bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM Submit Documentation Feedback...

  • Page 8: Top Silkscreen

    Physical Layouts 2.30 1.79 K002 Figure 4. Top Silkscreen 2.30 1.79 K003 Figure 5. Board Layout – Top Etch Layer bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM SLUU248 – May 2006 Submit Documentation Feedback...

  • Page 9: Board Layout - Second Etch Layer

    Physical Layouts 2.30 1.79 K004 Figure 6. Board Layout – Second Etch Layer 2.30 1.79 K005 Figure 7. Board Layout – Third Etch Layer SLUU248 – May 2006 bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM Submit Documentation Feedback...

  • Page 10: Board Layout - Bottom Etch Layer

    Physical Layouts 2.30 1.79 K006 Figure 8. Board Layout – Bottom Etch Layer bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM SLUU248 – May 2006 Submit Documentation Feedback...

  • Page 11: Bill Of Materials

    Reference designators marked with an asterisk (*) cannot be substituted. All other components can be substituted with equivalent MFR's components. Add shunt to JMP1-0.5, JMP2-AC, JMP3-EN, JMP4-1/2, JMP5-1/2, JMP6-1/2. References 1. bq24070 Single-Chip Charge and System Power-Path Management IC data sheet, SLUS694 SLUU248 – May 2006 bq24070 1.5-A Single-Chip Li-Ion and Li-Pol Charge Management IC EVM...
  • Page 12 February 2006 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.
  • Page 13 Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2006, Texas Instruments Incorporated EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 0 V to 6.5 V and the output...
  • Page 14 TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products...

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