1

FEATURES

DESCRIPTION

APPLICATIONS

APPLICATION SCHEMATIC

1

8

VDC

GND

1 F

m

IN

OUT

VBAT

bq24380

1 F

m

Charging

Circuit

6

SYSTEM

AC Adapter

2

VSS

bq24380

bq24381

bq24382

Overvoltage and Overcurrent Protection IC and Li+ Charger Front-End Protection IC With

LDO Mode

2

• Input Overvoltage Protection

The bq2438x family are charger front-end integrated

circuits designed to provide protection to Li-ion

• Accurate Battery Overvoltage Protection

batteries from failures of the charging circuitry. The IC

• Output Short-Circuit Protection

continuously monitors the input voltage and the

• Soft-Start to Prevent Inrush Currents

battery voltage. The device operates like a linear

• Soft-Stop to Prevent Voltage Spikes

regulator, maintaining a 5.5-V (bq24380) or 5-V

(bq24381, bq24382) output with input voltages up to

• 30-V Maximum Input Voltage

the

Input

overvoltage

threshold.

During

input

• Supports up to 1.7-A Load Current

overvoltage conditions, the IC immediately turns off

• Thermal Shutdown

the internal pass FET disconnecting the charging

circuitry from the damaging input source. Additionally,

• Enable Function

if the battery voltage rises to unsafe levels while

• Fault Status Indication

charging, power is removed from the system. The IC

• Small 2 mm × 2 mm 8-Pin SON Package

checks for short-circuit or overload conditions at its

output when turning the pass FET on, and if it finds

unsafe conditions, it switches off, and then rechecks

the conditions. Additionally, the IC also monitors its

• Smart Phones, Mobile Phones

die temperature and switches off if it exceeds 140°C.

• PDAs

When the IC is controlled by a processor, the IC

• MP3 Players

provides status information about fault conditions to

• Low-Power Handheld Devices

the host.

1

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 © 2008–2009, 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.