MOSFET-based load switches, whether implemented as an integrated circuit or I with discrete components, continue to bs popular choices for many engineers. They are favored in power-switching applications, such as battery-powered portable devices, including mobile handsets and notebook PCs. The center of the load switch, either integrated or discrete, is a MOSFET. Today, there are two major types of MOSFETs: trench and planar. Because of the different semiconductor fabrication technologies, the trench MOSFET is usually used as a component for the discrete load switch, whereas the planar MOSFET is more suitable as a building block of the integrated load switch IC. This article takes an easy-to-understand and nonmathematical approach in explaining the operational differences between a trench MOSFET and a planar MOSFET.
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