The LTC3780EG#PBF is a high efficiency synchronous 4-switch Buck-boost Controller operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phase-lockable frequency of up to 400kHz. With a wide 4 to 30V (36V maximum) input and output range and seamless transfers between operating modes, the LTC3780 is ideal for automotive, telecom and battery-powered systems. The operating mode of the controller is determined through the FCB pin. For boost operation, the FCB mode pin can select among Burst Mode® operation, Discontinuous mode and Forced Continuous mode. During buck operation, the FCB mode pin can select among Skip-Cycle mode, Discontinuous mode and Forced Continuous mode. Burst Mode® operation and Skip-Cycle mode provide high efficiency operation at light loads while forced continuous mode and discontinuous mode operate at a constant frequency.
● Single inductor architecture allows VIN above, below or equal to VOUT
● Synchronous rectification up to 98% efficiency
● Current mode control
● ±1% Output voltage accuracy (0.8V < VOUT < 30V)
● 200 to 400kHz Phase-lockable fixed frequency
● Power good output voltage monitor
● Internal LDO for MOSFET supply
● Quad N-channel MOSFET synchronous drive
● VOUT disconnected from VIN during shutdown
● Adjustable soft-start current ramping
● Fold back output current limiting
● Selectable low current modes
● Output overvoltage protection
