1 Features
• Input range from 3.5V to 55V
• Output voltage 3.3V to 55V
• Dynamical Vo programming via I2C from 3.3V
– up to 48V in 20mV monotonous steps
– up to 24V in 10mV monotonous steps
• Peak current regulation scheme
• Small voltage transition ripple over all 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
• DRV pin for external FET control
• Operation mode selection for high efficiency in light
load and high load conditions:
– Power save mode (burst/μSleep)
– Automatic/programmable conduction mode
• Integrated high voltage supply LDO
• Axillary 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
• Spread spectrum operation selectable
• High-side output current sensor
– Programmable from 1A to 7A in 50mA steps
– ISET pin selectable
• I2C Interface readout of (device configuration,
enhanced monitoring features, programmable
thermal warning)
• Create a custom design using the LM51772 with
the WEBENCH® Power Designer

2 Applications
• USB Type-C power delivery (Docking station, PCmonitor,
Desktop PC)
• Wireless charging
• Industrial PC/ Rugged PC
• Battery backup unit
• Merchant DC/DC
• avionics / marine sonar
• Off-highway vehicle

3 Description
The LM51772 is a four switch Buck-Boost controller.
It 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 LM51772 runs
at a fixed switching frequency, which can be set via
the RT/SYNC pin. The switching frequency remains
constant during buck, boost and buck-boost operation
in forced PWM. The external compensation pin allows
very fast transient responds for different applications.
(Continued)