LT4356CMS-3#PBF

LT4356-3 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. Device also monitors voltage drop between 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 active-low FLT pin pulls low to warn of impending power down. If the condition persists, the MOSFET is turned off, until active-low SHDN pin pulls low momentarily. Back-to-back FETs can be used in lieu of a schottky diode for reverse input protection, reducing voltage drop and power loss. Applications include automotive/avionic surge protection, hot swap/live insertion, high side switch for battery powered systems.

• Stops high voltage surges, adjustable output clamp voltage, overcurrent protection
• Wide operation range from 4V to 80V, reverse input protection to –60V
• Low 7µA shutdown current, adjustable latchoff fault timer
• Controls N-channel MOSFET
• Shutdown pin withstands –60V to 100V
• Fault output indication
• Auxiliary amplifier for level detection comparator or linear regulator controller
• VCC supply current of 1mA typical at V (active-low) SHDN = float
• 10-lead plastic MSOP package, 0°C to 70°C temperature range

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party