LTC3866EUF#PBF

The LTC3866EUF#PBF is a single-phase, current-mode synchronous step-down switching regulator controller manufactured by LT. It is designed to drive all N-channel power MOSFET switches and features a unique architecture for enhanced signal-to-noise ratio in current sensing, enabling the use of very low DCR power inductors for maximum efficiency in high current applications.

Key electrical specifications include a wide input voltage range of 4.5V to 38V and an output voltage range from 0.6V to 3.5V. The controller boasts high efficiency, up to 95%, and a programmable fixed frequency adjustable from 250kHz to 770kHz. Output voltage accuracy is ±0.5%, with Vref accuracy over temperature at 0.75%. It also includes features like selectable current sensing limit, programmable DCR temperature compensation, and die overtemperature thermal shutdown.

This controller is housed in a 24-lead, 4mm x 4mm QFN package and is designed for surface mount applications. It operates within a temperature range of -40°C to 85°C. The part also includes foldback output current limit and short-circuit soft recovery for robust operation.

Applications for the LTC3866EUF#PBF include high current power supplies where efficiency and precise current sensing are critical. Its design is suitable for systems requiring stable voltage regulation under varying load conditions.