1 Features

? Wide input voltage operating range: 4.2V to 60V

? Synchronous buck-boost DC/DC controller with

NFET drivers

– Adjustable switching frequency from 200kHz to

600kHz

– Optional synchronization to external clock

– Integrated loop compensation with soft start

– Selectable PFM operation for light load

efficiency improvement (PFM or forced PWM

option)

– Optional gate driver supply input for optimized

efficiency

? Support USB-PD Extended Power Range (EPR) in

forward and reverse power direction

– Adjustable input and output voltage regulation

from 3.3V to 60V with 20mV/step

– Adjustable input and output current regulation

(RAC_SNS, ROUT_SNS) from 400mA to 20A

with 50mA/step using 5mΩ resistor

? Bypass mode for highest efficiency with VOUT =

VAC

? Buck-only mode

? High accuracy

– ±2 output voltage regulation

– ±3 output current regulation

– ±2 input voltage 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

– Output overvoltage and overcurrent protection

– Thermal shutdown

? Status outputs

– Adapter present status (PG)

– Switcher operation status (STAT)

? Package

– 36-pin 5mm × 6mm QFN

2 Applications

? Docking station

? Monitor

? USB-PD EPR (Extended Power Range)

? Buck-Boost and Buck-only operation

3 Description

BQ25758 is a wide input voltage, bidirectional

switched-mode buck-boost controller. The device

offers high-efficiency power conversion over a wide

voltage range with output CC-CV control. The device

integrates all the loop compensation for the buckboost

converter, thereby providing a high density

solution with ease of use. In reverse mode, the device

draws power from the output supply and regulates the

input terminal voltage with an added constant current

loop for protection.

Besides the I2C host-controlled mode, the device also

supports programmable hardware limits. Input current,

and output current regulation targets can be set with

single resistor on the IIN, and IOUT pins, respectively.

By default, the device is programmed to provide 5V

output, and the target output voltage can be adjusted

via the VOUT_REG register bits.