Synchronous controller features integrated switching bias supply

13th February 2018
Lanna Cooper

Analog Devices has announced a 150V high efficiency (up to 99%) 4-switch synchronous buck-boost DC/DC controller, the Power by Linear LTC3777, which operates from input voltages above, below or equal to the regulated output voltage. Its 4.5-150V input voltage range operates from a high input voltage source or from an input that has high voltage surges, eliminating the need for external surge suppression devices, suitable for transportation, industrial and medical applications.

To prevent high on-chip power dissipation in high input voltage applications, the LTC3777 integrates a low quiescent current high efficiency switching bias supply for its internal power consumption.

The output voltage of the LTC3777 can be set from 1.2-150V at output currents up to tens of amps, depending on the choice of external components.Output power up to 500W can be delivered with a single device. Higher powers can be achieved when multiple circuits are configured in parallel.

The LTC3777’s powerful 1.5Ω N-channel MOSFET gate drivers can be adjusted from 6-10V, enabling the use of logic-level or standard-threshold MOSFETs.

The LTC3777 employs a proprietary current mode control architecture for constant frequency in buck, boost or buck-boost modes. The operating frequency can be synchronised to an external clock from 50-600kHz, while an input/output constant current loop provides support for battery charging and overload protection.

The user can select either forced continuous mode or discontinuous mode to maximise light load efficiency. Additional 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 shutdown.

The LTC3777 is available in a 48-lead e-LQFP package with pin skipping for high voltage spacing. Extended and industrial versions are available from -40 to 125°C.

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