With a maximum gate charge of 6 nC at 4.5 V, the PMV100XPEA215 switches fast with modest drive current. In a 500 kHz buck converter the gate-drive loss stays low enough that the SOT-23 package can handle the dissipation without derating. The 386 pF input capacitance at 10 V Vds confirms the switching speed is limited more by the gate-drive impedance than by the device itself.
Thermal reality in a SOT-23
The 463 mW power dissipation at 25°C ambient (Ta) is the number to use for board-level thermal design without a heatsink. The 4.45 W at case temperature (Tc) assumes a thermal pad or copper area on the PCB — in practice, layout engineers should stitch the SOT-23's tab via to a ground plane pour to keep junction temperature under 150°C at the 2.4 A continuous rating.
