P-channel power switch for high-current DC rails
The IRF4905PBF: Gate charge totals 180 nC at 10 V, so the gate driver must supply enough peak current to charge the input capacitance (3400 pF typical at 25 V) within the target switching interval.
Thermal and package constraints for the board
Maximum power dissipation is 200 W at case temperature 25°C — derate linearly with rising Tc; the TO-220AB tab must be heatsunk or the junction temperature will exceed the 175°C absolute maximum under sustained load. The through-hole TO-220AB package suits point-of-load or chassis-mount layouts where a screw or clip secures the tab to a heatsink.