A Single-Input-Four-Output (SIFO) Switched-Capacitor DC-DC Converter with Ordered-Sequential Switching

Dong Ju Lim; In Ho Park; Chul Woo Kim

doi:10.23075/jicas.2021.7.3.002

Dong Ju Lim Korea University
In Ho Park Korea University
Chul Woo Kim Korea university

DOI: https://doi.org/10.23075/jicas.2021.7.3.002

Keywords: Low-power Converter, Sequential Switching Scheme, Single-input-four-output Converter, Switched-capacitor DC-DC Converter

Abstract

In this paper, a single-input-four-output (SIFO) switched capacitor DC-DC converter is proposed for low-power SoCs. Ordered sequential switching is proposed for two outputs of the converter to reduce the output ripple voltages and improve current drive capability. In addition, a simple digital regulation loop can be adopted by this technique. The power stage of the converter is composed of 1.8-V/3.3-V transistors, and some of the switches are implemented with 3.3-V native-NMOS to maximize the area efficiency. Moreover, the power efficiency is improved and voltage stress is reduced on the power switches by using a reconfigurable voltage conversion ratio in a wide input range (1.1–1.6 V). The proposed converter has four outputs of 3 V, 2 V, 1.35 V, and 0.9 V with a maximum efficiency of 81% and output ripple voltages less than 50 mV even under a load condition of 100 μA, and produces an output power greater than twice that of existing state-of-the-art converters.

Author Biographies

Dong Ju Lim, Korea University

Dong Ju Lim received the B.S. and M.S. degrees in electrical engineering from Seokyeong University, Seoul, Korea in 2003 and 2005, respectively. He is currently pursuing the Ph.D. degree in electrical engineering with Korea university, Seoul. In 2005, he joined SK Hynix, Icheon, South Korea, where he is involved in EOS/ESD Protection Design. His research interests include integrated power management system design, dc-dc converters, and EOS/ESD protection circuit designs for DRAM/NAND Products.

In Ho Park, Korea University

In Ho Park received the B.S. degree in electrical electronic engineering from Korea University, Seoul, Korea in 2016, where he is currently working toward the combined M.S./Ph.D. degree. His research interests include integrated power management system designs, high-voltage silicon-based power converter designs, low-power CMOS analog circuit designs, and energy-harvesting circuit designs.

Chul Woo Kim, Korea university

Chul Woo Kim received the B.S. and M.S. degrees in electronics engineering from the Korea University in 1994 and 1996, respectively, and the Ph.D. degree in electrical and computer engineering from the University of Illinois at Urbana-Champaign in 2001.

In 1999, he worked as a summer intern at the Design Technology at Intel Corporation, Santa Clara, CA. In May 2001, he joined IBM Microelectronics Division, Austin, TX, where he was involved in Cell processor design. Since September 2002, he has been with the School of Electrical Engineering, Korea University, where he is currently a Professor. He was a Visiting Professor at the University of California at Los Angeles in 2008 and at the University of California at Santa Cruz in 2012. He is a coauthor of two books, namely, CMOS Digital Integrated Circuits: Analysis and Design (McGraw Hill, 4th edition 2014) and High-Bandwidth Memory Interface (Springer, 2013). His current research interests are in the areas of wireline transceiver, memory, power management and data converters. Dr. Kim received the Samsung HumanTech Thesis Contest Bronze Award (1996), the ISLPED Low-Power Design Contest Award (2001, 2014), the DAC Student Design Contest Award (2002), SRC Inventor Recognition Awards (2002), the Young Scientist Award from the Ministry of Science and Technology of Korea (2003), the Seoktop Award for excellence in teaching (2006, 2011) and ASP-DAC Best Design Award (2008) and Special Feature Award (2014), Korea Semiconductor Design Contest: Prime Minister Award (2016). He served on the Technical Program Committee of the IEEE International Solid-State Circuits Conference and as a Guest Editor for IEEE Journal of Solid-State Circuits. He is currently on the editorial board of IEEE Transactions on VLSI Systems and the Chair of the SSCS Seoul Chapter. He has been elected as Distinguished Lecturer of the IEEE Solid-State Circuits Society for 2015−2016.

Homepage : https://kilby.korea.ac.kr/

A Single-Input-Four-Output (SIFO) Switched-Capacitor DC-DC Converter with Ordered-Sequential Switching

Abstract

Author Biographies

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