Analog Devices Inc. LTC7892 2-Phase Boost Controller

Analog Devices LTC7892 2-Phase Boost Controller drives all N-channel synchronous gallium nitride (GaN) field effect transistor (FET) power stages with output voltages up to 100V. The high-performance dual boost DC-to-DC switching regulator controller streamlines the application design while requiring no protection diodes or additional external components compared to a silicon metal-oxide-semiconductor field effect transistor (MOSFET) solution. The internal smart bootstrap switches stop the overcharging of the BOOSTx pin to the SWx pin and the high-side driver during dead times, protecting the gate of the top GaN FET. The dead times of the LTC7892 can optionally be optimized with external resistors for margin or to customize the application for higher efficiency and enabling high-frequency operation. The gate drive voltage of the ADI LTC7892 can be precisely adjusted from 4V to 5.5V to optimize performance and permit different GaN FETs or even logic-level MOSFETs. The LTC7892 can operate from an input supply as low as 1V after start-up when biased from the boost converter regulator output.