30 V N-channel with 7.3 mOhm Rds(on) — the conduction-loss floor
That Rds(on) at the rated current sets the conduction-loss budget for a point-of-load converter or a low-side switch — at 14 A the I²R loss is about 1.4 W, which the 2.2 W power rating can handle with adequate copper on the board. The DirectFET package uses a can-style top-side cooling that pulls heat up through the board, so the thermal path depends on the via pattern under the die, not a traditional tab.
Gate charge at 4.5 V — switching-loss reality check
Total gate charge is 17 nC at 4.5 V, which is the figure a designer uses to size the gate driver. For a 500 kHz switching regulator, the gate-drive current needed is Qg × f = 17 nC × 500 kHz = 8.5 mA average, plus the peak current to charge the gate capacitance quickly — a standard 1 A driver handles that easily. The threshold voltage is 2.4 V max at 25 µA, so a 5 V logic-level gate drive fully enhances the channel; a 3.3 V GPIO may leave it in the linear region, increasing conduction loss.