LINEAR LTC3780 handbook
Datasheet
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 phase-lockable frequency of up to 400kHz. With a wide 4V to 30V input voltage range and up to 98% efficiency, the LTC3780 is ideal for battery-powered and other high voltage applications.