AP74502Q/AP74502HQ Low IQ Ideal Diode Controllers

The automotive-compliant AP74502Q and AP74502HQ ideal diode controllers from Diodes Incorporated provide a simple, cost-effective protection solution for reverse-polarity and overvoltage conditions. They drive two external back-to-back N-channel MOSFETs, which, coupled with their overvoltage lockout (OVLO) pin, provides input overvoltage protection as well as limited inrush current control.

The AP74502Q has a peak gate drive source capability of 60 µA that provides a longer turn-on time and inrush current limitation. The AP74502HQ has an 11 mA peak gate drive source capacity.

The AP74502Q and AP74502HQ do not have reverse current blocking features and are suitable for input reverse polarity protection of loads that may return energy to the input supply. This includes automotive body control module motor loads. The wide supply input range of 3.2 V to 75 V supports RVP and overvoltage protection in existing 12 V and 24 V battery systems, as well as the growing 48 V automotive battery systems utilized in xEV vehicles. Their 3.2 V operation capability ensures correct operation even in the severe cold-cranking conditions within automotive systems. The AP74502Q and AP74502HQ are available in the industry-standard SOT-28 package.