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LTC3780 - High Efficiency, Synchronous, 4-Switch Buck-Boost Controller

The LTC3780 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 phase-lockable frequency of up to 400kHz. With a wide 4V 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.

Fault protection is provided by an output overvoltage comparator and internal foldback current limiting. A Power Good output pin indicates when the output is within 7.5% of its designed set point.

Protected by U.S. Patents, including 5481178, 6304066, 5929620, 5408150, 6580258, patent pending on current mode architecture and protection

Features Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT Wide VIN Range: 4V to 36V Operation Synchronous Rectification: Up to 98% Efficiency Current Mode Control ±1% Output Voltage Accuracy: 0.8V < VOUT < 30V Phase-Lockable Fixed Frequency: 200kHz to 400kHz 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 Foldback Output Current Limiting Selectable Low Current Modes Output Overvoltage Protection Available in 24-Lead SSOP and Exposed Pad (5mm × 5mm) 32-Lead QFN Packages Typical Application

Applications Automotive Systems Telecom Systems DC Power Distribution Systems High Power Battery-Operated Devices Industrial Control Packaging

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