Single-Inductor Dual-Output DC-DC Converter with Multiple Flying Capacitors

Yilmaz H., Ozanoglu K., Cavallini P., Yazgı M.

19th International Conference on Synthesis, Modeling, Analysis and Simulation Methods, and Applications to Circuit Design, SMACD 2023, Funchal, Portugal, 3 - 05 July 2023 identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1109/smacd58065.2023.10192121
  • City: Funchal
  • Country: Portugal
  • Keywords: AMOLED display, DC-DC converters, flying capacitor, hybrid converter, power management integrated circuits, SIDO converter
  • Istanbul Technical University Affiliated: Yes

Abstract

This paper presents a novel single-inductor dual-output (SIDO) DC-DC converter topology with two flying capacitors. The two flying capacitors are located in the same current path, targeting an enhanced voltage drop reduction on the inductor, and a decrease in the inductor current slope, aiming for improved power efficiency and relaxed coil current constraints. Using specifications addressing battery-powered display driver applications, simulation results show up to 7.7% efficiency improvement compared to the conventional SIDO converter and up to 4.9% efficiency improvement compared to the SIDO converter with one flying capacitor topology. In addition, a reduction in inductor peak current and ripple can be achieved, along with a lower duty cycle operation, which all lead to relaxed coil selection criteria and relaxed converter stability constraints.