Next-generation semiconductors for DC-to-DC converters

Recent developments in power devices for low voltage DC-to-DC conversion are discussed with emphasis on switch-mode DC-to-DC synchronous buck converter applications. The system functional blocks are presented and the progress in various devices such as power trench MOSFETs, Schottky barrier rectifiers, and power ICs is reviewed. The optimization of a new power trench MOSFET with W-shaped gate structure (WFET) as both a control and synchronous switch is investigated. The factors influencing system partitioning such as required performance, current level, power dissipation, and cost objectives are highlighted.