P-channel in a 2x2 mm footprint
The IRFHS9301TRPBF is a 30 V P-channel HEXFET MOSFET in a 6-PQFN (2x2) (DFN2020) package — a 2 mm square body that fits tight load-switch or DC-DC converter layouts where board area is the constraint, not the current budget. Rds(on) is specified at 37 mOhm max with a 7.8 A drain current and 10 V gate drive; the same device also lists a 4.5 V drive option for lower-voltage logic rails, though the on-resistance will rise from the 37 mOhm figure.
Current rating: ambient vs case
Continuous drain current is rated 6 A at 25°C ambient (Ta) and 13 A at 25°C case (Tc) — the 2.1 W power dissipation at Ta is the practical limit for a 2x2 mm package without a heatsink. The 6 A figure assumes standard FR-4 with 1 oz copper; the 13 A figure needs the exposed pad soldered to a larger copper island on the PCB.
Gate charge and switching
Total gate charge is 13 nC at Vgs=10 V, with 580 pF input capacitance at Vds=25 V. For a 500 kHz switching regulator the gate drive current requirement is modest — roughly 6.5 mA average — but the 4.5 V drive threshold means a 5 V logic rail can turn it on fully; 3.3 V logic will need a level shifter or a driver.