High-power density hybrid converter topologies for low-power Dc-Dc SMPS

This paper gives a review of several emerging dc-dc converter topologies that combine capacitor-based and inductive converters in single hybrid converter structures. It is shown that, compared to the conventional topologies, the hybrid buck converters allow for a drastic reduction of the inductive components while minimizing switching losses and improving the overall power processing efficiency. Therefore, the hybrid converters result in a higher power density. As examples, buck with merged capacitive divider, a two-phase interleaved buck, and a differential buck-based multi-output power module for mobile applications are shown. The presented converters have up to four times smaller inductor volume and, at the same time, about 12% lower losses.