The LT4356HMS-1#TRPBF is a Surge Stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356 also monitors the voltage drop between the VCC and SNS pins to protect against over-current faults. An internal amplifier limits the current sense voltage to 50mV. In either fault condition, a timer is started inversely proportional to MOSFET stress. If the timer expires, the FLT pin pulls low to warn of an impending power down. If the condition persists, the MOSFET is turned off. After a cool down period, the GATE pin pulls up turning on the MOSFET again. The auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an external PNP pass transistor.
- Stops high voltage surges
- Adjustable output clamp voltage
- Over-current protection
- Reverse input protection to -60V
- Low 7μA shutdown current
- Adjustable fault timer
- Controls N-channel MOSFET
- Shutdown pin withstands -60 to 100V
- Fault output indication
- Auxiliary amplifier for level detection comparator or linear regulator controller
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