BQ25756: Standalone/I²C Controlled, 1- to 14-Cell Bidirectional Buck-Boost Battery Charge Controller

1 Features

Wide input voltage operating range: 4.2 V to 70 V
Wide battery voltage operating range: up-to 70 V with multi-chemistry support:
- 1- to 14-cell Li-ion charge profile
- 1- to 16-cell LiFePO₄ charge profile
Synchronous buck-boost charge controller with NFET drivers
- Adjustable switching frequency from 200 kHz to 600 kHz
- Optional synchronization to external clock
- Integrated loop compensation with soft start
- Optional gate driver supply input for optimized efficiency
Automatic maximum power point tracking (MPPT) for solar charging
Buck-only mode
Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range (EPR)
- Adjustable input voltage (VAC) regulation from 3.3 V to 65 V with 20-mV/step
- Adjustable input current regulation (R_{AC_SNS}) from 400 mA to 20 A with 50-mA/step using 5-mΩ resistor
High accuracy
- ±0.5% charge voltage regulation
- ±3% charge current regulation
- ±3% input current regulation
I²C controlled for optimal system performance with resistor-programmable option
- Hardware adjustable input and output current limits
Integrated 16-bit ADC for voltage, current, and temperature monitoring
High safety integration
- Adjustable input overvoltage and undervoltage protection
- Battery overvoltage and overcurrent protection
- Charging safety timer
- Battery short protection
- Thermal shutdown
Status outputs
- Adapter present status (PG)
- Charger operation status (STAT1, STAT2)
Package
- 36-pin 5 mm × 6 mm QFN