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.