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User's Guide

SLUU207A – October 2004 – Revised January 2007

bq2403x (bqTiny-III™) 1.5-A Single-Chip Li-Ion

and Li-Pol Charge Management IC EVM

This user’s guide describes the bq2403x (bqTiny-III™) Evaluation Module. The EVM
provides a convenient method for evaluating the performance of a charge management
and system power solution for portable applications using the bq2403x 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 (see the data sheet for correct device, x) using a dc power
supply. The charger is programmed from the factory to deliver 1 A of charging current.

Contents

1

Introduction

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2

2

Considerations When Testing and Using bq2403x ICs

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2

3

Performance Specification Summary

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3

4

Test Summary

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3

5

Schematic

...........................................................................................

7

6

Physical Layouts

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8

7

Bill of Materials

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13

8

References

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14

List of Figures

1

Test Diagram

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4

2

bq2403x EVM Schematic

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7

3

Top Assembly View

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8

4

Board Layout – Top Etch Layer

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9

5

Board Layout – Second Etch Layer

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10

6

Board Layout – Third Etch Layer

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11

7

Board Layout – Bottom Etch Layer

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12

List of Tables

1

Performance Specification Summary For bq24030/1/2/5 EVMs

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3

2

Bill of Materials

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13

bqTiny-III is a trademark of Texas Instruments.

SLUU207A – October 2004 – Revised January 2007

bq2403x (bqTiny-III™) 1.5-A Single-Chip Li-Ion

1

and Li-Pol Charge Management IC EVM

Submit Documentation Feedback

Summary of Contents for bq2403 Series

Page 1: ...dc power supply The charger is programmed from the factory to deliver 1 A of charging current Contents 1 Introduction 2 2 Considerations When Testing and Using bq2403x ICs 2 3 Performance Specification Summary 3 4 Test Summary 3 5 Schematic 7 6 Physical Layouts 8 7 Bill of Materials 13 8 References 14 List of Figures 1 Test Diagram 4 2 bq2403x EVM Schematic 7 3 Top Assembly View 8 4 Board Layout T...

Page 2: ...ulator connected to the OUT pin The bq24035 shuts down if the input exceeds 6 4 VDC The three potential sources to power the system VOUT are AC AC to DC adapter USB port and battery The IC is designed to power the system continuously The battery in most cases is the last line of backup If the AC or USB inputs are not available or disabled the battery connects to the system In thermal regulation co...

Page 3: ...ecifications of the EVM Table 1 Performance Specification Summary For bq24030 1 2 5 EVMs SPECIFICATION TEST CONDITIONS MIN TYP MAX UNITS Input DC Voltage VI AC 4 8 V 5 0 6 5 Volts Input DC USB Voltage VI USB 5 0 Battery Charge Current IO CHG 1 0 2 0 Amperes Power Dissipation bq2403x IC 1 Cell Pdiss Vin Vout Iout Vin Vbat Ibat see 1 Watts Vin Vldo ILDO 1 The HPA073 bq2403x thermal design is optimiz...

Page 4: ...5 switches the input to the output for VAC less than 6 V The bq24030 1 regulates VOUT to 6 V for larger inputs and the bq24035 turns off the charging and output for an AC input above 6 VDC 9 Verify VLDO is between 3 2 VDC and 3 4 VDC 10 Allow the battery to charge until VBAT is between 3 2 VDC and 4 0 VDC The charger should deliver the programmed constant current to the battery unless the input ca...

Page 5: ...hold is larger the charging current is reduced to keep the output voltage from dropping further If the battery voltage is higher the battery supplements the current to keep the output from dropping too much 50 mV to 200 mV below the battery voltage Note that setting PSEL to low USB mode PSEL high is AC mode selects the USB input as the primary source If the USB source is not present and the ac sou...

Page 6: ...es regulation 4 20 VDC for bq24030 2 5 and 4 1 VDC for bq24031 the charging current tapers off 39 Verify that the charging terminates when the battery current tapers to C 10 or 100 mA 1 A 10 programmed charge current divided by 10 Verify D2 STAT1 turns off High and D3 STAT2 turns on Low 40 If a load is applied across the battery such that the battery is discharged to 100 mV below the regulation vo...

Page 7: ...om 5 Schematic Schematic Figure 2 bq2403x EVM Schematic SLUU207A October 2004 Revised January 2007 bq2403x bqTiny III 1 5 A Single Chip Li Ion 7 and Li Pol Charge Management IC EVM Submit Documentation Feedback ...

Page 8: ...VM Figure 4 shows the top etch layer of the EVM Figure 5 shows the board second etch layer of the EVM Figure 6 shows the board third etch layer of the EVM Figure 7 shows the bottom etch layer of the EVM Figure 3 Top Assembly View 8 bq2403x bqTiny III 1 5 A Single Chip Li Ion SLUU207A October 2004 Revised January 2007 and Li Pol Charge Management IC EVM Submit Documentation Feedback ...

Page 9: ...m Physical Layouts Figure 4 Board Layout Top Etch Layer SLUU207A October 2004 Revised January 2007 bq2403x bqTiny III 1 5 A Single Chip Li Ion 9 and Li Pol Charge Management IC EVM Submit Documentation Feedback ...

Page 10: ...Physical Layouts Figure 5 Board Layout Second Etch Layer 10 bq2403x bqTiny III 1 5 A Single Chip Li Ion SLUU207A October 2004 Revised January 2007 and Li Pol Charge Management IC EVM Submit Documentation Feedback ...

Page 11: ... Physical Layouts Figure 6 Board Layout Third Etch Layer SLUU207A October 2004 Revised January 2007 bq2403x bqTiny III 1 5 A Single Chip Li Ion 11 and Li Pol Charge Management IC EVM Submit Documentation Feedback ...

Page 12: ...Physical Layouts Figure 7 Board Layout Bottom Etch Layer 12 bq2403x bqTiny III 1 5 A Single Chip Li Ion SLUU207A October 2004 Revised January 2007 and Li Pol Charge Management IC EVM Submit Documentation Feedback ...

Page 13: ... 1 16 W 1 603 Std Std R8 1 1 1 1 R10 Resistor Chip 0 Ω 1 16 W 1 603 Std Std 1 1 1 1 R11 Resistor Chip 22 6 kΩ 1 16 W 1 603 Std Std 1 1 1 1 R14 Resistor Chip 30 1 kΩ 1 16 W 1 603 Std Std 1 1 1 1 R15 Potentiometer 20 kΩ 1 4 inch Cermet 0 25 0 17 Bourns 3266W 203 12 turn top adjust 1 1 1 1 R16 Potentiometer 50 kΩ 1 4 inch Cermet 0 25 0 17 Bourns 3266W 503 12 turn top adjust 3 3 3 3 R3 R4 R5 Resistor ...

Page 14: ...om 8 References References 1 SLUS618 bq2403x Datasheet 14 bq2403x bqTiny III 1 5 A Single Chip Li Ion SLUU207A October 2004 Revised January 2007 and Li Pol Charge Management IC EVM Submit Documentation Feedback ...

Page 15: ...r other related directives Should this evaluation board kit not meet the specifications indicated in the User s Guide the board kit may be returned within 30 days from the date of delivery for a full refund THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED IMPLIED OR STATUTORY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNE...

Page 16: ...EVM If there are questions concerning the input range please contact a TI field representative prior to connecting the input power Applying loads outside of the specified output range may result in unintended operation and or possible permanent damage to the EVM Please consult the EVM User s Guide prior to connecting any load to the EVM output If there is uncertainty as to the load specification p...

Page 17: ...o change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for and you will fully indemn...

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