3,5 mm x 4,5 mm

Actual Size

www.ti.com

FEATURES

DESCRIPTION

APPLICATIONS

STAT1

IN

IN

PG

VCC

TTC

ISET1

ISET2

RHL PACKAGE

(TOP VIEW BQ24123)

STAT2

PGND

PGND

CE

SNS

BAT

CELLS

TS

20

1

11

10

2

3

4

5

6

7

8

9

19

18

17

16

15

14

13

12

bq24120

bq24123

SLUS688 – MARCH 2006

SINGLE-CHIP SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT

IC WITH ENHANCED EMI PERFORMANCE(bqSWITCHER™)

•

Enhanced EMI Performance

The bqSWITCHER™ series are highly integrated

Li-ion

and

Li-polymer

switch-mode

charge

•

Integrated Power FETs For Up To 2-A Charge

management devices targeted at a wide range of

Rate

portable applications. The bqSWITCHER™ series

•

Ideal For Highly Efficient Charger Designs For

offers integrated synchronous PWM controller and

Single-Cell or Two-Cell Li-Ion and Li-Polymer

power FETs, high-accuracy current and voltage

Battery Packs

regulation, charge preconditioning, charge status, and

•

Synchronous Fixed-Frequency PWM

charge termination, in a small, thermally enhanced

QFN package.

Controller Operating at 1.1 MHz With 0% to

100% Duty Cycle

The bqSWITCHER charges the battery in three

•

High-Accuracy Voltage and Current

phases: conditioning, constant current, and constant

Regulation

voltage.

Charge

is

terminated

based

on

user-

selectable minimum current level. A programmable

•

Status Outputs For LED or Host Processor

charge timer provides a safety backup for charge

Interface Indicates Charge-In-Progress,

termination. The bqSWITCHER automatically restarts

Charge Completion, Fault, and AC-Adapter

the charge cycle if the battery voltage falls below an

Present Conditions

internal threshold. The bqSWITCHER automatically

•

20-V Absolute Maximum Voltage Rating on IN

and OUT Pins

•

Accurate High-Side Battery Current Sensing

•

Battery Temperature Monitoring

•

Automatic Sleep Mode for Low Power

Consumption

•

Reverse Leakage Protection Prevents Battery

Drainage

•

Thermal Shutdown and Protection

•

Built-In Battery Detection

•

Available in 20 pin 3,5 mm x 4,5 mm QFN

Package

•

Handheld Products

•

Portable Media Players

•

Industrial and Medical Equipment

•

Portable Equipment

•

Portable DVD Players

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

bqSWITCHER, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.