A 97% high-efficiency 6μs fast-recovery-time buck-based step-up/down converter with embedded 1/2 and 3/2 charge-pumps for li-lon battery management

Min Woo Ko, Ki Duk Kim, Young Jin Woo, Se Un Shin, Hyun Ki Han, Yeunhee Huh, Gyeong Gu Kang, Jeong Hyun Cho, Sang Jin Lim, Se Hong Park, Hyung Min Lee, Gyu Hyeong Cho

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Lithium-ion batteries are generally used in mobile devices, but the voltage range of the battery varies from 2.7 to 4.2V. To provide a mid-3V-range output from the battery, a converter capable of step-up/down-conversion is necessary. For this purpose, non-inverting buck-boost topologies with multimode control [1-3] have been widely used. However, they have limited efficiency slightly higher than 90%, which comes from the fact that a main current path always encompasses two switches. To increase the efficiency in the buck mode where the converter operates for most of the usage time, a flying capacitor buck-boost (FCBB) was proposed in [4]. Despite its high power efficiency, it requires large-size LDMOS to endure a large voltage range up to 8V at switching node, resulting in cost inefficiency. Since all these topologies have a common controller that covers both buck and boost modes of operation, compensator design is challenging. Moreover, a non-minimum-phase system of boost operation makes it hard to achieve a fast loop response. In this paper, we propose a step-up/down DC-DC converter based on buck operation only over the whole input voltage range, which greatly simplifies the controller design and consequently gives fast response. Furthermore, it achieves high efficiency because of the reduced effective resistance on the main current path.

Original languageEnglish
Title of host publication2018 IEEE International Solid-State Circuits Conference, ISSCC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages428-430
Number of pages3
ISBN (Electronic)9781509049394
DOIs
Publication statusPublished - 2018 Mar 8
Event65th IEEE International Solid-State Circuits Conference, ISSCC 2018 - San Francisco, United States
Duration: 2018 Feb 112018 Feb 15

Publication series

NameDigest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume61
ISSN (Print)0193-6530

Other

Other65th IEEE International Solid-State Circuits Conference, ISSCC 2018
CountryUnited States
CitySan Francisco
Period18/2/1118/2/15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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    Ko, M. W., Kim, K. D., Woo, Y. J., Shin, S. U., Han, H. K., Huh, Y., Kang, G. G., Cho, J. H., Lim, S. J., Park, S. H., Lee, H. M., & Cho, G. H. (2018). A 97% high-efficiency 6μs fast-recovery-time buck-based step-up/down converter with embedded 1/2 and 3/2 charge-pumps for li-lon battery management. In 2018 IEEE International Solid-State Circuits Conference, ISSCC 2018 (pp. 428-430). (Digest of Technical Papers - IEEE International Solid-State Circuits Conference; Vol. 61). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISSCC.2018.8310367