A 5V-Input Sub-1V-Output Single-Inductor Multi-Path Hybrid Buck Converter Achieving 96.1% Peak Efficiency with 250mΩ DCR Inductor

This paper presents a single-inductor multi-path hybrid buck converter (SIMP) implemented in 180 nm CMOS process. The proposed SIMP converter reduces the inductor current stress by jointly using the capacitor path and inductor path to supply current to the load, and reduces the inductor voltage stress with two series connected flying capacitors in one phase. Resulting in the inductor DC current and inductor current ripple can be effectively reduced. Therefore, it can relieve significant power loss from a large DC conduction resistance (DCR) of the inductor. Simulation results show that the proposed SIMP obtains a peak efficiency of 96.1% with 250 mΩ DCR inductor, providing maximum output current of 1.6 A in 5 V input and 0.3-1 V output range.