MOSFET acts like a diode to protect against reverse polarity but with lower voltage drop.
The figures below are for the P-FET design. N-FET design will be similar except with minus signs instead.
1. The absolute maximum Vds should be at least -2Vbat, where Vbat is the voltage of the power supply/battery.
This is because in a situation when correct polarity rapidly switches to...
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