1 Features

? Wide input voltage operating range: 4.4V to 26V

? 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

– Optional gate driver supply input for optimized

efficiency

? Support USB-PD Standard Power Range (SPR) in

forward and reverse power direction

– Adjustable input and output voltage regulation

from 3.3V to 26V 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 SPR (Standard Power Range)

? Buck-Boost and Buck-only operation

3 Description

BQ25758S is a bidirectional switched-mode buckboost

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 buck-boost 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.