LT4363HDE-2#PBF, Hot-Swap Controller, 4 V to 80 V in, DFN-12, -40°C to 125°C

LT®4363 is a high voltage surge stopper with current limit protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in vehicles, by controlling the gate of an external N-channel MOSFET. The LT4363 also monitors the voltage drop between the SNS and OUT pins to protect against overcurrent faults. In either fault condition, a timer is started inversely proportional to MOSFET stress. Before the timer expires, the active-low FLT pin pulls low to warn of an impending power down. If the condition persists, the MOSFET is turned off. An internal amplifier limits the voltage across the current sense resistor to 50mV. Back-to-back MOSFETs can be used in lieu of a Schottky diode for reverse input protection, reducing voltage drop and power loss. Applications are automotive/avionic/industrial surge protection, hot swap™/live insertion, high side switch for battery powered systems, intrinsic safety applications.

• Two precision comparators can monitor the input supply for overvoltage and undervoltage conditions
• Output is limited to a safe value allowing the loads to continue functioning
• Withstands surges over 100V with VCC clamp
• Wide operating voltage range from 4V to 80V
• Restarts after a cool down period
• Adjustable output clamp voltage, low 7µA shutdown current
• Adjustable fault timer
• Reverse input current is -0.5mA (at VCC = -60V, active-low SHDN, UV, OV open, TA = 25°C, VCC = 12V)
• 12-lead (4mm × 3mm) plastic DFN package
• -40°C to 125°C temperature rating