LT4363: High Voltage Surge Suppressor with Current Limiting

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Summary:

The LT4363 surge suppressor protects the load from high voltage transients. It can regulate the output during overvoltage conditions (such as load dump in automotive applications) by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value, allowing the load to continue to operate. The LT4363 also monitors the voltage drop between the SNS and OUT pins to protect against overcurrent faults. An internal amplifier is used to limit the voltage across the current sense resistor to 50mV. Regardless of the fault condition, the start of the timer is inversely proportional to the MOSFET stress. The FLT pin will be pulled low before the timer expires to issue a "coming power off" warning. If this condition persists, the MOSFET will turn off. The LT4363-1 remains off before reset, while the LT4363-2 restarts after a cool cycle.

Device features can withstand VCC clamps to withstand surges above 80V Operating voltage range: 4V to 80V
Adjustable output clamp voltage fast overcurrent limit: < 5μs
Reverse input protection to -60V
Adjustable UV / OV Comparator Threshold
7μA low shutdown current shutdown pin can withstand -60V to 100V
Adjustable Fault Timer Controls N-Channel MOSFET
Retry duty cycle <1% during fault (LT4363-2)
Available in 12-pin (4mm x 3mm) DFN, 12-lead MSOP or 16-pin SO package

Applications Automotive / Avionics Surge Protection Hot SwapTM / Power Plugging High-End Switch Intrinsically Safe Applications for Battery-Powered Systems

The LT4363 data sheet can be found in the PDF document (click on the PDF file to download)