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Title: A 40nm CMOS hysteretic buck DC-DC converter with digital-controlled power-driving-tracked-duration current pump
Authors: Ding, Xiangbin
Chan, Pak Kwong
Leung, Ka Nang
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Ding, X., Chan, P. K., & Leung, K. N. (2020). A 40nm CMOS hysteretic buck DC-DC converter with digital-controlled Power-Driving-Tracked-Duration current pump. IEEE Access, 8, 177374-177384. doi:10.1109/ACCESS.2020.3026678
Journal: IEEE Access 
Abstract: A fast-transient voltage-mode hysteretic buck converter with digital-controlled power-drivingtracked-duration (PDTD) auxiliary current pump is proposed. The pump injection current duration is digitally controlled by the driving signal of the power stage. It aims at enhancing the transient response time which is limited by the large inductor used in typical buck converters and reducing the multiple undershoot/overshoot effect encountered in conventional current pump injection technique. The converter has been fabricated using TSMC 40nm CMOS technology with the silicon area of 830μm×620μm. The proposed converter regulates properly in both Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM). The measured output ripple is about 30mVpk and the switching frequency is about 1.45MHz. The peak efficiency is 93%. The measured load transient settling time for a 60-to-300mA/300-to-60mA load step change is 369ns/335ns, resulting in 350% faster than that of conventional counterpart without PDTD control scheme. The performance comparison with the representative state-of-art works has shown that the proposed converter shows good balance on performance metrics and the best figure-of-merit (FOM) in transient-response efficiency.
ISSN: 2169-3536
DOI: 10.1109/ACCESS.2020.3026678
Rights: © 2020 IEEE. This journal is 100% open access, which means that all content is freely available without charge to users or their institutions. All articles accepted after 12 June 2019 are published under a CC BY 4.0 license, and the author retains copyright. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, as long as proper attribution is given.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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