A fully on-chip three-terminal switched-capacitor DC–DC converter for low-voltage CMOS LSIs. (16th March 2016)

• Record Type: Journal Article
• Authors: Kojima, Yuta; Hirose, Tetsuya; Tsubaki, Keishi; Ozaki, Toshihiro; Asano, Hiroki; Kuroki, Nobutaka; Numa, Masahiro
• Is Part Of: Japanese journal of applied physics. Volume 55:Number 4(2016:Apr.)Supplement 4
• Publication Date: 2016-03-16
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.55.04EF09
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: In this paper, we present a fully on-chip switched-capacitor DC–DC converter for low-voltage CMOS LSIs. The converter has three terminals of input, ground, and output, by developing control circuits with fully on-chip configuration. We employ an ultra low-power nanoampere bias current and voltage reference circuit to achieve ultra low-power dissipation of control circuits. It enables us to realize a highly efficient power conversion circuit at light-load-current applications. The converter achieves highly efficient and robust voltage conversion using a pulse frequency modulation control circuit and a start-up/fail-safe circuit. Measurement results demonstrated that the converter can convert a 3.0 V input into 1.2 V output successfully. The start-up and fail-safe operations were confirmed through the measurement. The efficiency was more than 50% in the range of 2–6 µA load current.