LT4356HDE-1#PBF

The LT4356HDE-1#PBF is a surge stopper IC designed to protect downstream loads from high voltage transients, such as automotive load dump events. It regulates the output voltage by controlling the gate of an external N-channel MOSFET, limiting the output to a safe adjustable clamp voltage of 27V nominal. The device also monitors the voltage drop across an external sense resistor for overcurrent protection, with a typical current sense threshold of 50mV. In fault conditions, a timer inversely proportional to MOSFET stress is started; if the condition persists, the MOSFET is turned off and then restarted after a cool-down period.

The IC operates from a wide supply voltage range of 4V to 80V and features reverse input protection down to -60V. The shutdown current is typically 7µA, making it suitable for low-power standby applications. The auxiliary amplifier can be used as a voltage comparator or linear regulator controller (on the LT4356-2 variant). The LT4356HDE-1#PBF is offered in a 12-lead WFDFN exposed pad package (12-DFN 4x3) for surface mount assembly. Typical applications include automotive and avionic surge protection, hot swap/live insertion, high side switches, and intrinsic safety systems.