bq25A
Representative bq25A image (package may vary by manufacturer)
Overview
The BQ24725A is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications. The BQ24725A utilizes two charge pumps to separately drive n-channel MOSFETs (ACFET, RBFET and BATFET) for automatic system power source selection.
- 1 SMBus Host-controlled NMOS-NMOS synchronous buck converter with programmable 615kHz, 750kHz, and 885kHz switching frequencies
- Automatic N-channel MOSFET selection of system power source from adapter or battery driven by internal charge pumps
- Enhanced safety features for over voltage protection, over current protection, battery, inductor and MOSFET short circuit protection
- Programmable input current, charge voltage, charge current limits - ±0.5% Charge voltage accuracy up to 19.2V - ±3% Charge current accuracy up to 8.128A - ±3% Input current accuracy up to 8.064A - ±2% 20x Adapter current or charge current amplifier output accuracy
- Programmable battery depletion threshold, and battery LEARN function
- Programmable adapter detection and indicator
- Integrated soft start
- Integrated loop compensation
- Real time system control on ILIM pin to limit charge current
- AC Adapter operating range 4.5V-24V
