Analog Devices announces the Power by Linear LTC3777, a 150V high efficiency (up to 99%) 4-switch synchronous buck-boost DC/DC controller that operates from input voltages above, below or equal to the regulated output voltage.

The new product supports an input voltage range of 4.5 V to 150 V to operate from high input voltage sources or high input surges, eliminating the need for external surge suppression devices and making it ideal for transportation, industrial, and medical applications.

To prevent on-chip power dissipation that can occur in applications using high input voltages, the LTC3777 integrates a high efficiency switching bias supply with low quiescent current for internal power consumption.

The output voltage can be set from 1.2V to 150V, and output currents of up to 10A or more can be supplied, depending on the selection of external components. A single LTC3777 device can provide up to 500W of output power. Higher output power can be achieved by configuring multiple circuits in parallel. The LTC3777 also integrates powerful 1.5Ω N-channel MOSFET gate drivers that are adjustable from 6V to 10V, allowing the use of logic-level or standard-threshold MOSFETs.

The LTC3777 employs a proprietary current-mode control architecture for constant-frequency operation in buck, boost, or buck-boost modes. The operating frequency is synchronizable to an external clock from 50kHz to 600kHz, and input/output constant-current loops are provided to support battery charging and overload protection.

Users can choose between forced continuous or discontinuous operation to maximize light-load efficiency. Additional features include seamless transitions between operating ranges, power-good output voltage monitoring, adjustable soft-start and input overvoltage lockout (OVLO), and output voltage cutoff during shutdown.