The LTC4380 low quiescent current surge stopper protects loads from high voltage transients. Overvoltage protection is provided by clamping the gate voltage of an external N-channel MOSFET to limit the output voltage to a safe value during overvoltage events such as load dump in automobiles. Fixed gate clamp voltages are selectable for 12V and 24V/28V systems. For systems of any voltage up to 72V, use the adjustable gate clamp versions. Overcurrent protection is also provided.An internal multiplier generates a TMR pin current proportional to VDS and ID, so that operating time in both overcurrent and overvoltage conditions is limited in accordance with MOSFET stress.The GATE pin can drive back-to-back MOSFETs for reverse input protection, eliminating the voltage drop and dissipation of a Schottky diode solution. A low 8µA operating current permits use in always-on and battery powered applications. An accurate ON pin comparator monitors the input supply for undervoltage (UV) conditions and also serves as a shutdown input, reducing the quiescent current to 6µA.Applications Automotive/Avionic/Industrial Surge Protection Hot Swap, Live Insertion High Side Switch for Battery Powered Systems Automotive Load Dump Protection

Surge Suppressors Surge Stopper with Ideal Diode. Latchoff After Fault

The LTC4366 surge stopper protects loads from high voltage transients. By controlling the gate of an external N-channel MOSFET, the LTC4366 regulates the output during an overvoltage transient. The load may remain operational while the overvoltage is dropped across the MOSFET. Placing a resistor in the return line isolates the LTC4366 and allows it to float up with the supply; therefore, the upper limit on the output voltage depends only on the availability of high valued resistors and MOSFET ratings.An adjustable overvoltage timer prevents MOSFET damage during the surge while an additional 9-second timer provides for MOSFET cool down. A shutdown pin reduces the quiescent current to less than 14μA during shutdown. After a fault the LTC4366-1 latches off while the LTC4366-2 will auto-retry.Applications Industrial, Automotive and Avionic Surge Protection High Voltage DC Distribution 28V Vehicle Systems

High Voltage Surge Stopper Features: Rugged Floating Topology Wide Operating Voltage Range: 9V to >500V Adjustable Output Clamp Voltage Controls N-Channel MOSFET Adjustable Protection Timer Internal 9 Second Cool-Down Timer Shutdown IQ < 14μA Available in 8-Lead TSOT and 8-Lead 3mm × 2mm DFN Packages

High Voltage Surge Stopper Features: Rugged Floating Topology Wide Operating Voltage Range: 9V to >500V Adjustable Output Clamp Voltage Controls N-Channel MOSFET Adjustable Protection Timer Internal 9 Second Cool-Down Timer Shutdown IQ < 14μA Available in 8-Lead TSOT and 8-Lead 3mm × 2mm DFN Packages

High Voltage Surge Stopper Features: Rugged Floating Topology Wide Operating Voltage Range: 9V to >500V Adjustable Output Clamp Voltage Controls N-Channel MOSFET Adjustable Protection Timer Internal 9 Second Cool-Down Timer Shutdown IQ < 14μA Available in 8-Lead TSOT and 8-Lead 3mm × 2mm DFN Packages

High Voltage Surge Stopper Features: Rugged Floating Topology Wide Operating Voltage Range: 9V to >500V Adjustable Output Clamp Voltage Controls N-Channel MOSFET Adjustable Protection Timer Internal 9 Second Cool-Down Timer Shutdown IQ < 14μA Available in 8-Lead TSOT and 8-Lead 3mm × 2mm DFN Packages

100V Overvoltage, Undervoltage and Reverse Supply Protection Controller Features:Wide Operating Voltage Range: 2.5V to 60VOvervoltage Protection to 100VReverse Supply Protection to –40VLTC4367: Blocks 50Hz and 60Hz AC PowerLTC4367: 32ms Recovery from FaultLTC4367-1: Fast 500μs Recovery from FaultNo Input Capacitor or TVS Required for Most ApplicationsAdjustable Undervoltage and Overvoltage ThresholdsControls Back-to-Back N-Channel MOSFETsLow Operating Current: 70μALow Shutdown Current: 5μA8-Pin MSOP and 3mm × 3mm DFN PackagesAEC-Q100 Qualified for Automotive Applications

100V Overvoltage, Undervoltage and Reverse Supply Protection Controller Features:Wide Operating Voltage Range: 2.5V to 60VOvervoltage Protection to 100VReverse Supply Protection to –40VLTC4367: Blocks 50Hz and 60Hz AC PowerLTC4367: 32ms Recovery from FaultLTC4367-1: Fast 500μs Recovery from FaultNo Input Capacitor or TVS Required for Most ApplicationsAdjustable Undervoltage and Overvoltage ThresholdsControls Back-to-Back N-Channel MOSFETsLow Operating Current: 70μALow Shutdown Current: 5μA8-Pin MSOP and 3mm × 3mm DFN PackagesAEC-Q100 Qualified for Automotive Applications

100V UV/OV and Reverse Protection Controller with Bidirectional Circuit Breaker Features: Wide Operating Voltage Range: 2.5V to 60V Overvoltage Protection to 100V Reverse Supply Protection to –40V Bidirectional Electronic Circuit Breaker: +50mV Forward Sense Threshold –50mV Reverse (LTC4368-1) –3mV Reverse (LTC4368-2) Adjustable ±1.5% Undervoltage and Overvoltage Thresholds Low Operating Current: 80µA Low Shutdown Current: 5µA Controls Back-to-Back N-Channel MOSFETs Blocks 50Hz and 60Hz AC Power Hot Swappable Supply Input Pin-Selectable Overcurrent Auto-Retry Timer or Latchoff 10-Pin MSOP and 3mm × 3mm DFN Packages AEC-Q100 Qualified for Automotive Applications