SSCS Distinguished Lecturer Seminar - Continuously Scalable Conversion-Ratio Switched-Capacitor DC-DC Converter
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Switched-capacitor (SC) DC-DC converters make on-chip voltage conversion possible but are only effective at a few voltage conversion ratio (VCR) points. A new SC converter type called continuously scalable conversion-ratio (CSCR) SC was developed to operate across a continuous VCR range. In this talk, the invention, development, applications, and future of the CSCR SC will be discussed. Its topology and working principle will be introduced first, followed by the fundamental differences and benefits compared with traditional SC designs. It was first implemented as a buck converter and later extended to boost and buck-boost versions. VCR extension techniques, such as intermediate-rail reconfiguration, input-rail splitting, and stacking architecture, have made it applicable to solar and thermoelectric energy-harvesting interfaces.
Dr. Sijun Du received a B.Eng. degree (honors) in electrical engineering from the University Pierre and Marie Curie (UPMC), Paris, France, in 2011, and an M.Sc. degree (distinction) in electrical and electronic engineering from Imperial College, London, U.K., in 2012. He started his Ph.D. research in October 2014 and obtained his Ph.D. degree in electrical engineering from the University of Cambridge, Cambridge, U.K., in January 2018. He was a postdoctoral researcher at the Department of Electrical Engineering and Computer Sciences (EECS), University of California, Berkeley, CA, U.S.A., from 2018 to 2020. In 2020, he joined the Department of Microelectronics, Delft University of Technology (TU Delft), Delft, the Netherlands, as an associate professor. His current research is focused on energy-efficient integrated circuits and systems, including power management integrated circuits (PMIC), energy harvesting, wireless power transfer, and DC/DC converters.
He received the Dutch Research Council (NWO) Talent Program VENI grant in the 2021 round, the Best Student Paper Award in IEEE ICECS 2022, and the SSCS Reviewer Award in 2024 and 2025. He is an IEEE SSCS Distinguished Lecturer from 2026 to 2027. He serves as a technical program committee (TPC) member of IEEE ISSCC, IEEE ESSERC, and ISSCC Student Research Preview (SRP). He served as the IEEE ICECS sub-committee chair in 2022 and 2024, and the IEEE ISCAS sub-committee chair in 2025 and 2026. He is an IEEE Senior Member.