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.