BQ24314_1 Datasheet, PDF (1/25 Pages) Texas Instruments – OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND Li+ CHARGER FRONT-END PROTECTION IC

www.ti.com
bq24314
bq24316
SLUS763C – JULY 2007 – REVISED OCTOBER 2007
OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND
Li+ CHARGER FRONT-END PROTECTION IC
FEATURES
1
•2 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
• Available in Space-Saving Small 8 Lead 2×2
SON and 12 Lead 4x3 SON Packages
APPLICATIONS
• Mobile Phones and Smart Phones
• PDAs
• MP3 Players
• Low-Power Handheld Devices
• Bluetooth Headsets
DESCRIPTION
The bq24314 and bq24316 are highly integrated circuits 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. In case of an input overvoltage condition, 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 becomes too hot. 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
bq24316DSG
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
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 © 2007, Texas Instruments Incorporated