Texas Instruments BQ24300DSGT

Description
The bq24300 and bq24304 are integrated circuits designed to protect Li-ion batteries from charging circuit failures. The IC monitors input voltage, input current, and battery voltage. It operates like a linear regulator, holding the output at 5.5V (bq24300), 5.0V (bq24305), or 4.5V (bq24304) for voltages up to the Input Overvoltage threshold. In case of an input overvoltage condition, the IC removes power from the charging circuit by turning off an internal switch. In case of an overcurrent condition, it limits the current to a safe value for a blanking duration before turning the switch off. The IC also monitors its own die temperature and switches off if it becomes too hot.

Features
Provides protection for three variables:
Input overvoltage
Input overcurrent with current limiting
Battery overvoltage
30V maximum input voltage
Optional input reverse polarity protection
High immunity against false triggering due to voltage spikes
Robust against false triggering due to current transients
Thermal shutdown
Enable function
Small 2 mm x 2 mm 8-Pin SON package
LDO mode voltage regulation options:
5.5V on bq24300
4.5V on bq24304
5.0V on bq24305

Applications
Bluetooth headsets
Low-power handheld devices