LTC4380 Low Quiescent Current Surge Stoppers

Analog Devices' LTC4380 low quiescent current surge stoppers protect 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 12 V and 24 V / 28 V systems. For systems of any voltage up to 72 V, use the adjustable gate clamp versions. Overcurrent protection is also provided.

An internal multiplier generates a TMR pin current proportional to V_DS 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 8 μA 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 6 μA.

Video: LTC4380 Low Iq Surge Stopper for High Reliability Current Sensitive Applications