LTC3780 Datasheet | Linear Technology

Features n Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT n Wide VIN Range: 4V to 36V Operation n Synchronous Rectification: Up to 98% Efficiency n Current Mode Control n ±1% Output Voltage Accuracy: 0.8V < VOUT < 30V n Phase-Lockable Fixed Frequency: 200k Hz to 400k Hz n Power Good Output Voltage Monitor n Internal LDO for MOSFET Supply n Quad N-Channel MOSFET Synchronous Drive n VOUT Disconnected from VIN During Shutdown n Adjustable Soft-Start Current Ramping n Foldback Output Current Limiting n Selectable Low Current Modes n Output Overvoltage Protection n Available in 24-Lead SSOP and Exposed Pad (5mm × 5mm) 32-Lead QFN Packages APPLICATIONS n Automotive Systems n Tele Systems n DC Power Distribution Systems n High Power Battery-Operated Devices n Industrial Control LTC3780 High Efficiency, Synchronous, 4-Switch Buck-Boost Controller DESCRIPTION The LTC®3780 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phaselockable frequency of up to 400k Hz. With a wide 4V to 30V (36V maximum) input and output range and seamless transfers between operating modes, the LTC3780 is ideal for automotive, tele 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. Fault protection is provided by an output overvoltage parator and internal foldback current limiting. A power good output pin indicates when the output is...