A Fully Integrated Fine-Grained Dual-Output Switched-Capacitor DC-DC Converter for Low-Power Applications

Doo Jin Jang; Jeong Myeong Kim; Wan Yeong Jung

doi:10.23075/jicas.2021.7.4.005

Doo Jin Jang Korea Advanced Institute of Science and Technology (KAIST) https://orcid.org/0000-0003-0152-612X
Jeong Myeong Kim Korea Advanced Institute of Science and Technology (KAIST) https://orcid.org/0000-0002-6498-1309
Wan Yeong Jung Korea Advanced Institute of Science and Technology (KAIST) https://orcid.org/0000-0002-5671-1341

DOI: https://doi.org/10.23075/jicas.2021.7.4.005

Keywords: Algorithmic Voltage-feed-in, DC-DC Converter, Dual outputs, On-Chip Converter, Switched-capacitor DC-DC Converter

Abstract

This paper presents a fully integrated fine-grained dual-output switched-capacitor DC-DC converter that satisfies the requirements of low-power applications. In order to generate a large number of VCRs for dual-output, the converter is partially modified from an algorithmic voltage-feed-in (AVFI) topology, which adds one more output terminal to the original topology. In addition, since the presented converter scheme separates a converter into two individual converters and generates independent VCRs for each converter, a larger number of VCRs can be obtained than that of AVFI converters when not using partitioning techniques. A test chip was fabricated using 0.18 μm standard CMOS process. The measured result shows conversion efficiencies higher than 86.3 % over a range of output voltages from 0.3V to 3.0V for a 3.3V input. In this voltage range, 39 VCRs are distributed for 10 power cells.

Author Biographies

Doo Jin Jang, Korea Advanced Institute of Science and Technology (KAIST)

Doo Jin Jang received the B.S. degree in electrical engineering and computer science from Kyungpook National University, Daegu, South Korea, in 2010, and the M.S. degree in information and communications from Gwangju Institute of Science and Technology (GIST), Gwangju, South Korea, in 2014. He is currently pursuing the Ph.D. degree in electrical engineering with the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea. His research interests include energy-efficient power management integrated circuits.

Jeong Myeong Kim, Korea Advanced Institute of Science and Technology (KAIST)

Jeong Myeong Kim received the B.S. degree in electrical and computer engineering from Ajou University, Suwon, South Korea, in 2020. He is currently pursuing the M.S. degree in electrical engineering with the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea. His research interests include energy-efficient power management integrated circuits.

Wan Yeong Jung, Korea Advanced Institute of Science and Technology (KAIST)

Wan Yeong Jung received the B.S. degree from Seoul National University, Seoul, South Korea, in 2012, and the M.S. and Ph.D. degrees in electrical engineering from the University of Michigan, Ann Arbor, MI, USA, in 2014 and 2017, respectively. He was a Research Intern with NVIDIA Research, Austin, TX, USA, in 2016. From 2017 to 2019, he was a Post-Doctoral Associate with Microsystems Technology Laboratories, Massachusetts Institute of Technology, Cambridge, MA, USA. Since 2019, he has been an Assistant Professor with the School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea. His research interests include low-power circuits and systems, energy-efficient edge computing, and Internet of Things (IoT).

Homepage : https://seed.kaist.ac.kr/