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1 Introduction
1.1 EVM Features
User's Guide
SLUU290A – March 2008 – Revised June 2009
bq24704/5EVM (HPA297) For Multicell Synchronous
Notebook Charger
The purpose of the bq24704/5EVM is for evaluating a multicell, synchronous notebook charge and path
selection solution using bq24704/5 devices. This document includes a test summary, EVM schematic
diagram, bill of materials, and printed-circuit board layouts.
Contents
1 Introduction ................................................................................................................... 1
2 Test Summary ................................................................................................................ 4
3 PCB Layout Guideline ....................................................................................................... 8
4 Bill of Materials, Board Layout, and Schematics ........................................................................ 8
List of Figures
1 Original Test Setup for HPA297 (bq24704/5EVM) ...................................................................... 6
2 Test Setup for HPA297 (bq24704/5EVM) ................................................................................ 7
3 Top Layer .................................................................................................................... 10
4 Second Layer ............................................................................................................... 11
5 Third Layer .................................................................................................................. 12
6 Bottom Layer ................................................................................................................ 13
7 Bottom Assembly ........................................................................................................... 14
8 Top Assembly ............................................................................................................... 15
9 Top Silkscreen .............................................................................................................. 16
• Evaluation module for bq24704/5
• High-efficiency NMOS-NMOS synchronous buck charger with 600-kHz (bq24705) and 300-kHz
(bq24704) frequency
• Battery/adapter to system power selector function
• User-selectable 2-cell, 3-cell, or 4-cell Li-ion battery voltage
• User-programmable battery regulation voltage with external voltage source (4.2/cell by default)
• User-programmable charge current with external voltage source (3 A by default)
• User-programmable input current limit with external voltage source (4.5 A by default)
• Pin-programmable interface for control and status communications with host
• AC adapter operating range 18 V to 22 V
• LED indication for control and status signals
• Test points for key signals available for testing purpose. Easy probe hook-up
• Jumpers available. Easy to change connections
SLUU290A – March 2008 – Revised June 2009 bq24704/5EVM (HPA297) For Multicell Synchronous Notebook Charger 1
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