Synchronous buck-boost controller includes integrated switching bias supply

Analog Devices has released the Power by Linear LTC3777, a 150V high efficiency (up to 99%) four-switch synchronous buck-boost DC-DC controller. The device runs from input voltages above, below or equal to the regulated output voltage. The device's 4.5V to 150V input voltage range runs from a high input voltage source or from an input that has high voltage surges, removing the need for external surge suppression devices, ideal for industrial, transportation and medical applications. The device employs a proprietary current mode control architecture for constant frequency in boost, buck or buck-boost modes. The operating frequency can be synchronised to an external clock from 50kHz to 600kHz, while an input/output constant current loop offers support for overload protection and battery charging. The user can choose either forced discontinuous or continuous mode to maximise light load efficiency. Extra features include seamless transfers between operating regions, a power good output voltage monitor, adjustable soft-start and input overvoltage lockout, and output voltage disconnect during a shutdown.