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.