LT4356IDE-2#TRPBF

LT4356 is a surge stopper protects loads from high voltage transient. 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 LT4356 also monitors the voltage drop between the VCC and SNS pins to protect against overcurrent faults. In either fault condition, a timer is started inversely proportional to MOSFET stress. If the timer expires, the active-low FLT pin pulls low to warn of an impending power down. The auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an external PNP pass transistor. Back-to-back FETs can be used in lieu of a Schottky diode for reverse input protection, reducing voltage drop and power loss. Typical applications are automotive/avionic surge protection, hot swap/live insertion, high side switch for battery powered systems, intrinsic safety applications.

• Output is limited to a safe value thereby allowing the loads to continue functioning
• An internal amplifier limits the current sense voltage to 50mV
• Stops high voltage surges, adjustable output clamp voltage
• Wide operation range from 4V to 80V
• Adjustable fault timer
• Fault output indication
• Reverse input current is 0.3mA typical (at VSNS=VCC= –30V, active-low SHDN open, TA=25°C, VCC=12V)
• 12-lead (4mm × 3mm) plastic DFN package
• –40°C to 85°C temperature rating

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