A Single-Mode Hybrid Buck-Boost Converter with No Right-Half-Plane Zero

This paper presents a single-mode hybrid Buck-Boost converter (HBBC) for Lithium-ion battery-powered smart-phones. Thanks to the charge-pump configuration (formed by two flying capacitors $C_{F 1}, C_{F 2}$) between battery input and second-order low-pass filter (formed by inductor $L$ and filter capacitor $C_{o}$), the novel topology exhibits many attractive features in comparison to the conventional Buck-Boost converter (CBBC), including single-mode two-phase operation, continuous input and output current delivery, smaller voltage rated switches, and no right-half-plane (RHP) zero. Simulation results show that a peak efficiency of 96.9% can be obtained for the HBBC with an inductor having a DC resistance (DCR) of $100 ~\mathrm{m} \Omega$.