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User's Guide
SLUU358 – April 2009
1.1-A, Single-Input, Single-Cell, Li-Ion Battery Charger
With 50-mA LDO and 2.3-A Production Test Support
This user's guide describes the bq25040 evaluation module (EVM), how to setup the EVM to perform a
stand-alone evaluation or interface with a system or host. The charger is designed to deliver up to 1.1 A of
continuous current to the battery output in the adapter mode, ISET, or current limits the input to either 100
mA or 500 mA when in USB100/500 modes. The charge is programmed from the factory for 0.51 A in
ISET mode. In the Protection Test Support (PTS) mode, the battery output is capable of delivering > 2.3 A
of current for short pulses. The LDO regulator output can deliver up to 50 mA of current.
Contents
1 Introduction
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2
2 Considerations When Testing the bq25040 IC
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2
3 Performance Specification Summary
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4 Test Summary
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4.1 Equipment
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3
4.2 Equipment and EVM Setup
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3
4.3 Test Procedure
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5 Schematics
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6 Layout
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7 Bill of Materials
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List of Figures
1 Evaluation Setup Charging Circuit Shown; Pulse Programming Circuit not Shown
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3
2 One-Pulse Programming Shows Change From USB500 to ISET Mode
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3 Two-Pulse Programming Shows Timing of Program Change From 0.4 A to 0.1 A
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4 Power-Up Sequence Shows Timing Between Vin, Viset, Vpg, and Vchg. C1: Chg @ JMP1; C4: PG @
JMP8; LEDs Pulled Up to 4.15-V Battery
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5
5 Basic EVM Charger Circuit
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6 Circuit for Programming Pulse (Typically Done by Host)
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7 Assembly Layer
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8 Top Copper Layer
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9 Bottom Copper Layer Bottom View
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List of Tables
1 HPA437A Bill of Materials - bq25040
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SLUU358 – April 2009 1.1-A, Single-Input, Single-Cell, Li-Ion Battery Charger With 50-mA LDO and 2.3-A Production Test Support 1
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