On-resistance is the toll a MOSFET charges on every amp that passes through it, and in a battery-powered product that toll is paid out of the battery. The size of the toll depends on two conditions the datasheet states and that beginners routinely ignore: the gate voltage and the junction temperature. Battery life is a … Read more
A MOSFET does not get hot because it is faulty. It gets hot because it is a resistance while it conducts and a lossy transition while it switches, and both of those produce heat in proportion to the current you push through it. The interesting part is that the heating tends to accelerate itself. A … Read more
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