“The controllers have all the features necessary to implement a fast reverse polarity protection circuit. They also include a load disconnect function in case of over-voltage and under-voltage events,” according to the company. “Unlike ideal diodes with reverse current blocking, these devices are suitable for applications where energy may return to the input supply.”
External n-channel mosfets are required, and there is an internal charge pump to drive their gates.
Part AP74502Q sources a low peak gate – typically 60μA – providing slow mosfet turn-on of the external mosfets, tending to limit in-rush.
It cousin, AP74502HQ, typically increases this to 11mA to turn the mosfets quickly. While timing depends on mosfet type, it can be in under 1μs.
Both devices have a heavy (2.3A) sink to turn the mosfets off quickly during high-voltage spikes – the device can withstand and protect loads down to -65V.
Quiescent current is 62µA with the charge pump on, and 1µA when disabled.
Packaging is SOT28, and operation is over -40 to +125°C.
Use is foreseen in 12, 24 and 48V vehicles, for which the ICs are qualified to AEC-Q100 Grade 1, manufactured in facilities certified to IATF 16949, and available with supporting PPAP documents.
Find both ideal diode controllers on this Diodes data sheet
There was a flurry of ideal diode ICs in august last year
