An 83% peak efficiency and 1.07W/mm2 power density Single Inductor 4-Output DC-DC converter with Bang-Bang Zeroth-Order Control

This paper presents a new control scheme dubbed Bang-Bang Zeroth-Order Control (BBZOC) for Single Inductor Multiple Output (SIMO) buck converter. The main loop control utilizes a phase detector, charge pump, filter, and comparator. The SIMO buck converter with BBZOC simplifies the compensation design compared to conventional voltage mode control. This work is fabricated in 1P4M 0.35um BCD process and achieves 83% maximum efficiency with the rated output power of 1.04W. The maximum output power is 2.7W and the maximum power density is 1.07 W/mm2. Considering the difference in the process, this work represents the state of the art in the power density.