1 Features

• Input range from 3.5V to 36V

• Dynamical Vo programming using I2C from:

– 3.3V up to in 20mV monotonous steps

– 1V up to 23V in 10mV monotonous steps

• Peak current regulation control

• Small voltage transition ripple overall operating

modes

• Dynamic output voltage tracking (digital PWM

tracking input, analog tracking input)

– Via I2C interface programming

• Shut down quiescent current 3μA

• Operating quiescent current 60μA

• Drive (DRV) pin for dual role port power path

– Push-Pull output for fast pMOS FET control

– Configurable as charge pump driver stage for

nMOS FET

• Operation mode selection for high efficiency in light

load and high load conditions:

– Power save mode (Single Pulse/μSleep)

– Automatic conduction mode

• Integrated high voltage supply LDO

• Auxiliary high voltage LDO for microcontroller

supply

• Integrated full-bridge gate drive

– 2A peak current capability

– Bootstrap over and under-voltage protection

– Integrated boot-strap diode

• Fixed frequency independent from operating mode

(boost, buck-boost, buck)

– Forced PWM mode selectable

– Switching frequency from 100kHz to 2200kHz

– External clock synchronization and clock output

• Spread spectrum operation selectable

• Average input or output current sensor

– Programmable from 0.5A to 7A in 50mA steps

• I2C programmable with diagnostics

• Automotive temperature range (Tj = -40°C to

150°C)

• 40-Pin WSON package with wettable flanks

• Functional Safety-Capable

– Documentation available to aid functional safety

• Create a custom design using the LM251772-Q1

with the WEBENCH® Power Designer

2 Applications

• Automotive infotainment, digital cockpit

• USB-PD EPR (extended power range)

3 Description

The LM251772-Q1 is a four switch Buck-Boost

controller. The device provides a regulated output

voltage if the input voltage is higher, equal or lower

than the adjusted output voltage. In power save

mode the device supports very high efficiency over

the complete operation range of the output. The

output voltage and average current is dynamically

programmable using the integrated I2C interface. The

configuration range for output voltage and average

current meets the USB-PD standard requirements.

The integrated DRV pin is used to control an optional

disconnect FET if the system is targeted to support

dual role port (DRP) requirements.

LM251772-Q1 runs at a fixed switching frequency,

which is set using the RT/SYNC pin. The switching

frequency remains the same during buck, boost and

buck-boost operation. The device maintains small

mode transition ripple over all operating modes.