LT4363HDE-2#PBF

The LT®4363 surge stopper protects loads from high voltage
transients. It regulates the output during an overvoltage
event, by controlling the gate of an external N-channel
MOSFET. The output is limited to a safe value allowing the
loads to continue functioning. The LT4363 also monitors
the voltage drop between the SNS and OUT pins to protect
against overcurrent faults. An internal amplifier limits the
voltage across the current sense resistor to 50mV. In either
fault condition, a timer is started inversely proportional to
MOSFET stress. Before the timer expires, the FLT pin pulls
low to warn of an impending power down. If the condition
persists, the MOSFET is turned off. The LT4363-1 remains
off until reset whereas the LT4363-2 restarts after a cool
down period.
Two precision comparators can monitor the input supply
for overvoltage (OV) and undervoltage (UV) conditions.
When the potential is below the UV threshold, the external
MOSFET is kept off. If the input supply voltage is above the
OV threshold, the MOSFET is not allowed to turn back on.
Back-to-back MOSFETs can be used in lieu of a Schottky
diode for reverse input protection, reducing voltage drop
and power loss. A shutdown pin reduces the quiescent
current to less than 7µA during shutdown.