A Buck converter, created with a monolithic implementation of series connected MOSFETs at high-voltage, is presented. Using a single low-voltage control signal to trigger the bottom MOSFET in the series stack, a voltage division across parasitic and inserted capacitances in the circuit is used to turn on the entire stack of devices. The governing equations for the Stacked MOSFET are presented, and reliable operation for use in a Buck converter is presented in a 0.180 um Silicon-on-Insulator (SOI) CMOS process. The prototype is shown to handle 25 mA with a rail voltage of 3.3 V and a frequency range of 1–20 Megahertz.
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