Texas Instruments bq2425xEVM-150, User Manual

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User's Guide
SLUUA08A – March 2013 – Revised April 2013
bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger
This user's guide describes the characteristics, operation, and use of the bq24250EVM-150,
bq24251EVM-150, and bq24257EVM-150 evaluation modules (EVM). These EVMs enable test and
evaluation TI's bq24250, bq24251, and bq24257 devices. The bq2425x series are highly integrated,
single-cell, Li-Ion battery chargers targeted for space-limited, portable applications with high-capacity
batteries. This user's guide includes EVM specifications, the schematic diagram, test procedures, test
results, a bill of materials, and board layout.
Contents
1 Introduction
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2 EVM Considerations
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3 Recommended Operating Condition
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4 Equipment and EVM Setup
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4.1 Schematic
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4.2 I/O Description
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4.3 Test Points
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4.4 Pin Descriptions
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4.5 Control and Key Parameters Setting
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5 Test Procedure
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5.1 Definition
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5.2 Recommended Test Equipment
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5.3 Software
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5.4 Recommended Test Equipment Set Up
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5.5 Recommended Test Procedure
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6 Test Results
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6.1 Output Regulation Ripple
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6.2 Efficiency Data
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6.3 Thermal Performance
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7 Layout and Bill of Materials
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7.1 Printed-Circuit Board Layout Guideline
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7.2 Layout
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7.3 Bill of Materials (BOM)
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List of Figures
1 bq2425xEVM-150 Schematic
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2 Original Test Setup
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3 Battery Emulator
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4 Connector Kit
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5 Main Window of the bq2425xSW Evaluation Software
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6 Output Regulation Ripple at ICHG = 1000 mA
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7 Output Regulation Ripple at ICHG = 120 mA
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8 Efficiency Versus Output Current While in Battery Voltage Regulation (4.2V)”
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9 Thermal Image
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10 bq2425xEVM-150 Top Assembly
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11 bq2425xEVM-150 Top Silkscreen
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I
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C is a trademark of NXP.
1 SLUUA08A – March 2013 – Revised April 2013 bq2425xEVM-150, Single-Cell Li-Ion Switch-Mode Charger
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