100 V, 2.7 mOhm — the conduction-loss floor for high-current rails
The Infineon IPB027N10N5ATMA1 is an N-channel MOSFET from the OptiMOS™ family, built for low on-resistance at high current density. That is the conduction-loss floor for the design — at 50 A the dissipation is 6.75 W, which the D2PAK tab can sink with a reasonable copper area. The 139 nC total gate charge at 10 V tells the drive stage what it needs to deliver: at 100 kHz switching, the average gate current is 13.9 mA, well within a standard gate-driver IC's capability.
