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User's Guide
SLUU464–November 2010
bq24450EVM
This user's guide describes the features and operation of the bq24450EVM Evaluation Module (EVM).
This EVM assists users in evaluating the bq24450 linear battery charger. The manual includes the
bq24450EVM bill of materials, board layout, and schematic.
Contents
1 Introduction .................................................................................................................. 2
1.1 EVM Features ...................................................................................................... 2
1.2 General Description ................................................................................................ 2
1.3 I/O Description and Jumper Functions .......................................................................... 2
1.4 Recommended Operating Conditions ........................................................................... 3
2 Equipment .................................................................................................................... 3
2.1 Power Supplies ..................................................................................................... 3
2.2 Loads ................................................................................................................ 3
2.3 Meters ............................................................................................................... 3
3 Equipment Setup ............................................................................................................ 3
4 Procedure .................................................................................................................... 4
4.1 Pre-charge .......................................................................................................... 4
4.2 Max Charge ......................................................................................................... 4
4.3 Charge Termination ................................................................................................ 4
4.4 Re-Charge .......................................................................................................... 4
5 Functions and Features .................................................................................................... 5
5.1 Changing Output Voltage and Charge Current ................................................................ 5
5.2 Options for External Transistor ................................................................................... 6
5.3 Other Options ....................................................................................................... 6
6 PCB Layout Guideline ...................................................................................................... 6
7 Bill of Materials, Board Layouts and Schematic ........................................................................ 7
7.1 Bill of Materials ..................................................................................................... 7
7.2 Board Layout ....................................................................................................... 8
7.3 Schematic ........................................................................................................... 9
List of Figures
1 Original Test Setup for HPA691 (bq24450 EVM)....................................................................... 3
2 Battery Load Circuit – PR1010-2 ......................................................................................... 4
3 Calculating the Value of I
TAPER
............................................................................................. 5
4 Top Assembly Layer........................................................................................................ 8
5 Top PCB Layer.............................................................................................................. 8
6 Bottom PCB Layer.......................................................................................................... 9
7 bq24450 EVM Schematic.................................................................................................. 9
List of Tables
1 I/O Description............................................................................................................... 2
2 Recommended Operating Conditions.................................................................................... 3
3 Bill of Materials.............................................................................................................. 7
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SLUU464–November 2010 bq24450EVM
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