1 Features
• Provides Protection for Three Variables:
– Input Overvoltage, with Rapid Response in < 1
μs
– User-Programmable Overcurrent with Current
Limiting
– Battery Overvoltage
• 30 V Maximum Input Voltage user•
Supports up to 0.3 A Input Current
• Robust Against False Triggering Due to Current
Transients
• Thermal Shutdown
• Enable Input
• Status Indication – Fault Condition

2 Applications
• Mobile Phones and Smart Phones
• PDAs
• MP3 Players
• Low-Power Handheld Devices
• Bluetooth™ Headsets

3 Description
The bq24311 is a highly integrated circuit designed to
protect Li-ion batteries from charging circuit failures.
The IC continuously monitors the input voltage, input
current, and battery voltage. The input overvoltage protection immediately removes power from the
charging circuit by turning off an internal switch. The
input protection limits the system current at the user•
programmable 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 IC can be controlled by a processor and also
provides status information about fault conditions to
the host.