LT4363IMS-1#PBF

The LT4363 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, 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 50mV. 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.

Key Features

• Withstands Surges Over 80V with V_CC Clamp
• Wide Operating Voltage Range: 4V to 80V
• Adjustable Output Clamp Voltage
• Fast Overcurrent Limit: Less Than 5μs
• Reverse Input Protection to –60V
• Adjustable UV/OV Comparator Thresholds
• Low 7μA Shutdown Current
• Shutdown Pin Withstands –60V to 100V
• Adjustable Fault Timer
• Controls N-Channel MOSFET
• Less Than 1% Retry Duty Cycle During Faults, LT4363-2
• Available in 12-Pin (4mm × 3mm) DFN, 12-Pin MSOP or 16-Pin SO Packages

Application

• Avionic/Industrial Surge Protection
• Hot Swap^™/Live Insertion
• High Side Switch for Battery Powered Systems
• Intrinsic Safety Applications