BQ24382 Datasheet, PDF (1/18 Pages) Texas Instruments – Overvoltage and Overcurrent Protection IC and Li+ Charger Front-End Protection IC With LDO Mode

bq24380
bq24381
bq24382
www.ti.com......................................................................................................................................................... SLUS805B – APRIL 2008 – REVISED MARCH 2009
Overvoltage and Overcurrent Protection IC and Li+ Charger Front-End Protection IC With
LDO Mode
FEATURES
1
•2 Input Overvoltage Protection
• Accurate Battery Overvoltage Protection
• Output Short-Circuit Protection
• Soft-Start to Prevent Inrush Currents
• Soft-Stop to Prevent Voltage Spikes
• 30-V Maximum Input Voltage
• Supports up to 1.7-A Load Current
• Thermal Shutdown
• Enable Function
• Fault Status Indication
• Small 2 mm × 2 mm 8-Pin SON Package
APPLICATIONS
• Smart Phones, Mobile Phones
• PDAs
• MP3 Players
• Low-Power Handheld Devices
DESCRIPTION
The bq2438x family are charger front-end integrated
circuits designed to provide protection to Li-ion
batteries from failures of the charging circuitry. The IC
continuously monitors the input voltage and the
battery voltage. The device operates like a linear
regulator, maintaining a 5.5-V (bq24380) or 5-V
(bq24381, bq24382) output with input voltages up to
the Input overvoltage threshold. During input
overvoltage conditions, the IC immediately turns off
the internal pass FET disconnecting the charging
circuitry from the damaging input source. Additionally,
if the battery voltage rises to unsafe levels while
charging, power is removed from the system. The IC
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
die temperature and switches off if it exceeds 140°C.
When the IC is controlled by a processor, the IC
provides status information about fault conditions to
the host.
APPLICATION SCHEMATIC
AC Adapter
VDC
GND ^{1 mF}
1 IN
OUT 8
bq24380
VBAT 6
Charging
Circuit
1 mF
SYSTEM
VSS
2
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.
PowerPAD is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2009, Texas Instruments Incorporated