Hi.
I am designing new device at work, it is gonna be powered from 12V and there is an switch mode regulator simmilar to TPS54426 at the input. One of the requirements was that it should be able to withstand when someone swaps the power (idealy up to -20V on the input).
I used one shotky diode ( SK16 equivalent ) in series with the regulator and figured out that this should be enough, even tho it has quite big reverse leakage current (500uA at 25°C and up to 5mA at 75°C). But one of my coworkers insisted that since the leakage is significant, there should be another shotky cathode to VIN and anode to ground.
My idea is, that even tho there is nothing about allowed negative currents to VIN pins in the datasheet, they should be able to withstand at least 1mA current each (there are two). And that there is always protective diode between positive voltage and ground inherent to integrated circuit technology.
Any ideas?