LT4356-1

LT4356-1/LT4356-2 Surge Stopper FEATURES n Stops High Voltage Surges n Adjustable Output Clamp Voltage n Overcurrent Protection n Wide Operation Range: 4V to 80V n Reverse Input Protection to –60V n Low 7μA Shutdown Current, LT4356-1 n Adjustable Fault Timer n Controls N-channel MOSFET n Shutdown Pin Withstands –60V to 100V n Fault Output Indication n Guaranteed Operation to 125°C n Auxiliary Amplifier for Level Detection Comparator or Linear Regulator Controller n Available in (4mm × 3mm) 12-Pin DFN, 10-Pin MSOP or 16-Pin SO Packages APPLICATIONS n Automotive/Avionic 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 of Linear Technology Corporation. All other trademarks are the property of their respective owners. DESCRIPTION The LT®4356 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 overcurrent 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 ...