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
• 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 (RAC_SNS)
from 400 mA to 20 A with 50-mA/step using
5-mΩ 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
– Battery short protection
– Thermal shutdown
• Status outputs
– Adapter present status (PG)
– Charger operation status
• Package
– 36-pin 5 mm × 6 mm QFN

2 Applications
• Cordless power and garden tools
• Solar backup charger
• Energy storage systems
• Drone
• Ultrasound
• X-ray systems
• Electronic hospital beds and bed control
• Multiparameter patient monitors

3 Description
The BQ25750 is a wide input voltage, switched-mode
buck-boost Li-Ion, Li-polymer, or LiFePO4 battery
charge controller with direct power path control.
The device offers high-efficiency battery charging
over a wide voltage range with accurate charge
current and charge voltage regulation, in addition to
automatic charge preconditioning, termination, and
charge status indication. The device integrates all
the loop compensation for the buck-boost converter,
thereby providing a high density solution with ease of
use. In reverse mode, the device draws power from
the battery and regulates the SYS terminal voltage.