Launching as the industry's first fixed PMOS 1A low dropout regulator for low-noise designs, the IRU1502-33 exhibits a dropout voltage of less than 0.6V at full load current. The device comes in a ...

From a simplistic viewpoint, due to the apparent symmetry, you’d want to have an NMOS device at the bottom and expect a PMOS ... current. Hence, NMOS and NPN are predominant in power circuits.