Q: How the reverse polarity protection operating in MAX14919?
A： All four OUT_ switches in MAX14919 are automatically turned off when reverse current is detected. The MAX14919 detection works very fast (to protect the chip against huge current that can flow if a user connects a 24V PSU directly to the OUT pin with reverse polarity): reverse current of microsecond length is enough to trigger the detection.
If the load has LC (=inductance and capacitance) components, then can have LC oscillation (of voltage and current) when a switch is turned on. This oscillation can trigger reverse polarity detection and protection. An example of a LC-load is a capacitive load that is connected via a long cable (which has cable inductance). Capacitive loads are very uncommon in industrial applications – usually they are RL loads.
If customer doesn't require reverse protection function, they can bypass the external FET, or waiting for our new version device public.