ANALOG DEVICES DC2027A-A

DC2027A-A demonstration circuit showcases the LTC®4364 surge stopper with ideal diode in a 12V, 1A application. DC inputs of up to 80V and transients to 250V are limited to just 28.7V at the output. Sagging and reverse-polarity inputs of up to -24V are isolated from the output by a reverse-blocking MOSFET configured as an ideal diode. Further, the output is protected against backfeeding. The output may be driven -20V to +30V without circuit damage or back feeding into the input. A 4.7μF timer capacitor and robust forward MOSFET permit the load to operate through ISO-7637-2 load dump waveform 5A. Sustained overvoltage or overcurrent conditions cause the LTC4364 to turn off after a timer delay. The LTC4364-1 (DC2027A-A) latches off and is reset by pulling (active low)SHDN low for at least 100μs.