> In continuous regime now you have 30 Amp. X 0.0053 Ohm = 159 mW.
> 
> It doesn't seem to be too much to heat the mosfet.
> 
> But maybe you are switching the mosfet. You didn't tell anything about
switching
> frequency.
> In that case the scenario is different.

That was my initial reaction too, switching losses rather than IIR
losses. What is he driving the gate with? At any reasonable switching
frequency he is probably going to need a MOSFET driver chip to get a
couple of amps gate drive, which you definitely won't get from an MCU
pin.
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