bq24004

bq24005

bq24006

www.ti.com

SLUS476F – DECEMBER 2000 – REVISED MAY 2012

TWO-CELL Li-ION CHARGE MANAGEMENT IC

FOR PDAs AND INTERNET APPLIANCES

Check for Samples: bq24004, bq24005, bq24006

1

FEATURES

DESCRIPTION

2

•

Highly Integrated Solution With FET Pass

The bq2400x series ICs are advanced Li-Ion linear

Transistor and Reverse-Blocking Schottky and

charge management devices for highly integrated and

Thermal Protection

space-limited

applications.

They

combine

high-

•

Integrated Voltage and Current Regulation

accuracy current and voltage regulation; FET pass-

With Programmable Charge Current

transistor and reverse-blocking Schottky; battery

conditioning, temperature, or input-power monitoring;

•

High-Accuracy Voltage Regulation (±1%)

charge termination; charge-status indication; and

•

Ideal for Low-Dropout Linear Charger Designs

charge timer in a small package.

for Two-Cell Li-Ion Packs With Coke or

Graphite Anodes

The bq2400x measures battery temperature using an

external thermistor. For safety, the bq2400x inhibits

•

Up to 1.2-A Continuous Charge Current

charge until the battery temperature is within the

•

Safety-Charge Timer During Preconditioning

user-defined thresholds. Alternatively, the user can

and Fast Charge

monitor the input voltage to qualify charge. The

bq2400x series then charge the battery in three

•

Integrated Cell Conditioning for Reviving

phases:

preconditioning,

constant

current,

and

Deeply Discharged Cells and Minimizing Heat

constant voltage. If the battery voltage is below the

Dissipation During Initial Stage of Charge

internal low-voltage threshold, the bq2400x uses low-

•

Optional Temperature or Input-Power

current

precharge

to

condition

the

battery.

A

Monitoring Before and During Charge

preconditioning

timer

provides

additional

safety.

•

Various Charge-Status Output Options for

Following pre- conditioning, the bq2400x applies a

Driving Single, Double, or Bicolor LEDs or

constant-charge current to the battery. An external

sense-resistor sets the magnitude of the current. The

Host-Processor Interface

constant-current phase is maintained until the battery

•

Charge Termination by Minimum Current and

reaches the charge-regulation voltage. The bq2400x

Time

then transitions to the constant voltage phase. The

•

Low-Power Sleep Mode

user can configure the device for cells with either

coke or graphite anodes. The accuracy of the voltage

•

Packaging: 20-Lead TSSOP PowerPAD™

regulation is better than ±1% over the operating

junction temperature and supply voltage range.

APPLICATIONS

Charge is terminated by maximum time or minimum

•

PDAs

taper current detection

•

Internet Appliances

The bq2400x automatically restarts the charge if the

•

MP3 Players

battery voltage falls below an internal recharge

•

Digital Cameras

threshold.

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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.

2

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2012, 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.