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Data Sheet
BQ25751: Standalone/I2C Controlled, 70V Bidirectional
Buck-Boost Lead Acid Battery Charge Controller with Direct Power Path Control
1 Features
- Wide input voltage operating range: 4.4V to 70V
- Wide
battery voltage operating range: up-to 70V
- 6V up-to 48V lead-acid charging
profile with bulk, absorb and float voltage charging phases
- Charge voltage temperature
compensation
- Synchronous buck charge controller with NFET drivers
- Adjustable switching frequency from
200kHz to 600kHz
- Optional synchronization to external
clock
- Integrated loop compensation with
soft start
- Optional gate driver supply input for
optimized efficiency
- Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range
(EPR)
- Adjustable input voltage (VAC)
regulation from 3.3V to 65V with 20mV/step
- Adjustable input current regulation
(RAC_SNS) from 400mA to 20A with 50mA/step using 2mΩ resistor
- Direct power path management for highest efficiency to power system
- System power selection from adapter
or battery
- Dynamic power management
- All N-channel FET drivers
- 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
- Low battery
quiescent current
- High safety integration
- Adjustable input overvoltage and
undervoltage protection
- Battery
Overvoltage and overcurrent protection
- Charging safety timer in CV Mode
- Thermal shutdown
- Status outputs
- Adapter present status
(PG)
- Charger
Operation status
- Package
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