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FEATURES

DESCRIPTION

TYPICAL APPLICATION

bq24200, bq24201

bq24202, bq24203

bq24204, bq24205

SLUS501C – OCTOBER 2001 – REVISED MARCH 2008

www.ti.com

SINGLE-CHIP LI-ION AND LI-POL CHARGE MANAGEMENT IC FOR CURRENT-LIMITED

APPLICATIONS

• Designed Specifically to Work With

Current-Limited Wall Supplies

The bq2420x series are simple Li-Ion linear charge

management devices targeted at low-cost and space

• Ideal for Low Dropout Charger Design for

limited charger applications. The bq2420x series offer

Single-Cell Li-Ion Packs With Coke or Graphite

integrated

powerFET,

high-accuracy

voltage

Anodes

regulation, temperature monitoring, charge status,

• Integrated PowerFET for 500 mA

and charge termination, in a single monolithic device.

• Integrated Voltage Regulation With 0.5%

The

bq2420x

is

designed

to

work

with

a

Accuracy

current-limited wall-mount transformer and therefore

• Battery Insertion and Removal Detection

does not provide any current regulation. However,

these devices offer a fixed internal current limit to

• Charge Termination by Minimum Current and

prevent

damage

to

the

internal

powerFET.

A

Time

time-limited pre-conditioning phase is provided to

• Pre-Charge Conditioning With Safety Timer

condition deeply discharged cells. Once the battery

• Sleep Mode for Low-Power Consumption

reaches the charge voltage, the high accuracy

voltage regulation loop takes over and completes the

• Charge Status Output for LED or Host

charge

cycle.

Charge

is

terminated

based

on

Processor Interface Indicates

minimum current. An internal charge timer provides a

• Charge-in-Progress, Charge Completion, and

backup safety for charge termination.

Fault Conditions

Other standard features include an automatic sleep

• Optional Temperature Monitoring Before and

During Charge

voltage and a recharge feature activated when the

• Small, 8-Pin Power-Pad MSOP Package

In addition to the standard features, the core product

provides two additional enhancements: temperature

monitoring and status display. The temperature-

sense

circuit

continuously

measures

battery

temperature using an external thermistor and inhibits

charge until the battery temperature is within the

user-defined thresholds. The STAT pin indicates

three conditions of operation of the charger. These

conditions are charge-in-progress, charge complete,

and fault. This output can be used to drive an LED or

an interface to a microcontroller.

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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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2001–2008, 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.