1 Features

• Input range from 0V (V(BIAS) ≥ 3.5V) to 55V

• Output voltage 1V to 55V

• Dynamical Vo programming via I2C from:

– 3.3V up to 48V in 20mV steps

– 1V up to 24V in 10mV steps

• Peak current regulation control

• Small voltage transition ripple overall operating

modes

• Shut down quiescent current 3μA

• Operating quiescent current 60μA

• DRV pin for external FET control

• Operation mode selection for high efficiency in light

load and high load conditions:

– Power save mode (Single Pulse/μSleep)

– Automatic/programmable conduction mode

• Integrated high voltage supply LDO

• Auxiliary high voltage LDO/reference

• 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 2.2MHz

– External clock synchronization and clock output

• Average input or output current sensor

– Programmable from 0.5A (5mV) to 7A (70mV)

in 50mA (500μV) steps

– ISET pin selectable

• I2C programmable with diagnostics

– I2C usage is optional, alternative feature

selection via CFG-Pins

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

150°C)

• 40-Pin WSON package with wettable flanks

• Create a custom design using the LM51772-Q1

with the WEBENCH® Power Designer

2 Applications

• Automotive ADAS domain controllers

• Automotive infotainment, digital cockpit

• Automotive sensor fusion

• USB-PD EPR (extended power range)

• Automotive energy storage, battery/super-cap

backup

3 Description

The LM51772-Q1 is a four switch Buck-Boost

controller with optional I2C control. The device

provides a regulated output voltage if the input

voltage is higher, equal or lower than the adjusted

output voltage. In power safe mode the device

supports very high efficiency at light and high load

conditions and features a programmable pass-through

function(PCM). The second over-voltage protection

is user programmable and can be used to limit the

voltage during moisture (test) conditions. Numerous

monitoring features like a thermal warning help to

maintain the system housekeeping.

LM51772-Q1 runs at a fixed switching frequency,

which can be set via the RT/SYNC pin. The switching

frequency remains the same during buck, boost and

buck-boost operation. The device maintains small

mode transition ripple overall operating modes. The

integrated and optional high-side current sensor

features an accurate output or input current limitation.

The average current limit of the LM51772-Q1 is also

configurable through the I2C interface.