1 Features

1• Provides Protection for Three Variables:

– Input Overvoltage Protection

– User-Programmable Overcurrent with Current

Limiting

– Battery Overvoltage

• Maximum Input Voltage of 30 V

• Supports up to 1.5-A 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

WSON

2 Applications

• Mobile Phones and Smart Phones

• PDAs

• MP3 Players

• Low-Power Handheld Devices

• Bluetooth™ Headsets

3 Description

The bq24312 device is a highly integrated circuit (IC)

designed to provide protection to Li-ion batteries from failures of the charging circuit. The device

continuously monitors the input voltage, the input

current, and the battery voltage. In case of an input

overvoltage condition, the device 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 device also monitors its own die temperature and switches off if it exceeds 140°C. The

input overcurrent threshold is user-programmable.

The device can be controlled by a processor and also

provides status information about fault conditions to

the host.