Automotive, 55V 4-switch buck-boost controller with I2C interface

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.