BQ24315 Datasheet, PDF (1/20 Pages) Texas Instruments – OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND Li+ CHARGER FRONT-END PROTECTION IC

bq24315
www.ti.com
SLUS817 – MARCH 2008
OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND
Li+ CHARGER FRONT-END PROTECTION IC
FEATURES
1
•23 Provides Protection for Three Variables:
– Input Overvoltage, with Rapid Response in
< 1 µs
– User-Programmable Overcurrent with
Current Limiting
– Battery Overvoltage
• 30V Maximum Input Voltage
• Supports up to 1.5A Input Current
• Robust Against False Triggering Due to
Current Transients
• Thermal Shutdown
• Enable Input
• Status Indication – Fault Condition
• 5.5V LDO Mode Voltage Regulation
• Available in Space-Saving Small 8 Lead 2×2
SON
APPLICATIONS
• Mobile Phones and Smart Phones
• PDAs
• MP3 Players
• Low-Power Handheld Devices
• Bluetooth™ Headsets
DESCRIPTION
The bq24315 is a highly integrated circuit designed to provide protection to Li-ion batteries from failures of the
charging circuit. The IC continuously monitors the input voltage, the input current, and the battery voltage. The
output of the bq24315 acts a linear regulator. The output is regulated to 5.5V for inputs between 5.5V and the
overvoltage threshold. If an input overvoltage condition occurs, the IC immediately removes power from the
charging circuit by turning off an internal switch. In the case of an overcurrent condition, it limits the system
current at the threshold value, and if the overcurrent persists, switches the pass element OFF after a blanking
period. Additionally, the IC also monitors its own die temperature and switches off if it exceeds 140°C. The input
overcurrent threshold is user-programmable.
The IC can be controlled by a processor and also provides status information about fault conditions to the host.
APPLICATION SCHEMATIC
AC Adapter
VDC
GND
1 mF
1 IN
OUT 8
bq24315
VBAT 6
1 mF
bq24080
Charger IC
SYSTEM
FAULT 4
CE 5
2
7
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
Bluetooth is a trademark of Bluetooth SIG, Inc.
3
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, Texas Instruments Incorporated