LT4356HDE-2

• Product Introduction

LT4356HDE-2 

peculiarity Suppression of high voltage surges Adjustable output clamping voltage Overcurrent protection Wide operating voltage range: 4V to 80V Reverse input protection to -60V Low Shutdown Current: 7μA (LT4356-1) Adjustable fault timer Control of N-channel MOSFETs The shutdown pin can withstand -60V to 100V Fault output indication Guaranteed to work up to 125°C It can be used as a level-checking comparator or as a backup amplifier for a linear regulator controller Available in (4mm x 3mm) 12-pin DFN, 10-pin MSOP, or 10-pin SO packages description ®The LT 4356 surge suppressor protects the load from damage caused by high-voltage transients. It is capable of adjusting the output during overvoltage processes (e.g., 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 operating. The LT4356-1 also monitors the voltage drop between the VCC and SNS pins to prevent it from being affected by an overcurrent fault. An internal amplifier is used to limit the current sense voltage to 50mV. Regardless of the fault condition, the timer starts inversely proportional to the MOSFET stress. If the timer operation is terminated, the FLT pin will be pulled to low to warn of "power loss imminent". If this condition persists, the MOSFET will shut down. After a cooldown cycle, the GATE pin is pulled high to switch on the MOSFET again. The backup amplifier can be used as a voltage-sense comparator or a linear regulator controller to drive an external PNP transistor. sensor Back-to-back FETs can be used in place of Schottky diodes to provide reverse input protection, reducing voltage drop and power loss. For the LT4356-1, a single shutdown pin reduces the quiescent current during its shutdown to less than 7uA. The LT4356-2, on the other hand, differs from the LT4356-1 in that it reduces quiescent current to 60uA during downtime and keeps the auxiliary amplifier in operation for use such as undervoltage latching circuitry or always-on regulators. apply Automotive/avionics surge protection Hot-swappable/live plugging High-end switches for battery-powered systems Intrinsically safe application

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