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.