An app note from International Rectifier on using P-Channel MOSFETs
P-Channel HEXFET Power MOSFETs offer the designer a new option that can simplify circuitry while optimizing performance and parts count. In principle, nothing can be done with a P-Channel MOSFET that cannot be done with an N-Channel plus some extra gate drive circuitry. The main advantage of a P-Channel device is circuit simplification in medium and low power applications. This app note explains that P-Channel MOSFET has significant higher power losses that discourage its application in higher power circuits.