ADI Launches Non-Isolated Synchronous Step-Down Regulator Controller
Published2017.06.09 14:24Analog Devices announced the release of the LTC7801, a high-voltage non-isolated synchronous step-down switching regulator controller.
This product is available in a compact 24-pin package that drives the entire N-channel MOSFET power stage. With an input voltage range of 4V to 140V (150V abs max), it is designed to operate from high-input voltage sources or inputs with high-voltage surges, eliminating the need for external surge suppression devices. The LTC7801 is suitable for transportation, industrial control, robotics, and datacom applications because it continues to operate at a duty cycle of up to 100% even as the input voltage drops to 4V.
The output voltage can be set within the range of 0.8V to 60V with 96% efficiency at an output current of up to 20A. This device is ideal for always-on systems because it consumes only 40µA of power in sleep mode under output voltage regulation.
The internal charge pump enables a 100% duty cycle and continuous device operation even during dropout, making it useful when power needs to be supplied from the battery during discharge. The powerful 1Ω N-channel MOSFET gate driver of the LTC7801 can be adjusted in the 5V to 10V range to allow the use of logic or standard level MOSFETs for maximum efficiency.
The LTC7801 includes an NDRV pin to prevent significant on-chip power consumption in high input voltage applications, which drives the gate of an optional external N-channel MOSFET that functions as a low-dropout linear regulator to power the IC. The LTC7801 can also draw power from the output of a switching regulator or other available sources via the EXTVCC pin, allowing for reduced power consumption and increased efficiency.
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