LT4363 Datasheet | Linear Technology

High Voltage Surge Stopper with Current Limit Features n Withstands Surges Over 100V with VCC Clamp n Wide Operating Voltage Range: 4V to 80V n Adjustable Output Clamp Voltage n Fast Overcurrent Limit: Less Than 5µs n Reverse Input Protection to - 60V n Adjustable UV/OV parator Thresholds n Low 7µA Shutdown Current n Shutdown Pin Withstands - 60V to 100V n Adjustable Fault Timer n Controls N-Channel MOSFET n Less Than 1% Retry Duty Cycle During Faults, LT4363-2 n Available in 12-Pin (4mm × 3mm) DFN, 12-Pin MSOP and 16-Pin SO Packages Applications n Automotive/Avionic/Industrial Surge Protection n Hot Swap™/Live Insertion n High Side Switch for Battery Powered Systems n Intrinsic Safety Applications L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No RSENSE, Thin SOT and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Description The LT®4363 surge stopper 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 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 50m V. 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 parators 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...