BQ24314 Datasheet, PDF (1/13 Pages) Texas Instruments – OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND Li+ CHARGER FRONT-END PROTECTION IC

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bq24314
bq24316
SLUS763 – JULY 2007
OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND
Li+ CHARGER FRONT-END PROTECTION IC
FEATURES
1
• Provides Protection for Three Variables:
– Input Overvoltage
– Input Overcurrent (User-Programmable)
– Battery Overvoltage
• 30V Maximum Input Voltage
• Supports up to 1.5A Input Current
• High Immunity Against False Triggering Due
to Voltage Spikes
• Robust Against False Triggering Due to
Current Transients
• Thermal Shutdown
• Status Indication – Fault Condition
• Available in Space-Saving Small 8 Lead 2×2
SON and 12 Lead 4x3 SON Packages
APPLICATIONS
• 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.
AC Adapter
VDC
GND
1 mF
APPLICATION SCHEMATIC
1 IN
OUT 8
bq24316DSG
VBAT 6
1 mF
Charging
Circuit
SYSTEM
FAULT 4
CE 5
7
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.
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2007, Texas Instruments Incorporated