A 12V-to-1V switched-capacitor-assisted hybrid converter with dual-path charge conduction and zero-voltage switching

Xiongjie Zhang; Qiaobo Ma; Yang Jiang; Man-Kay Law; Pui-In Mak; Rui P. Martins

doi:10.1587/elex.18.20210382

LETTER

A 12V-to-1V switched-capacitor-assisted hybrid converter with dual-path charge conduction and zero-voltage switching

Xiongjie Zhang, Qiaobo Ma, Yang Jiang, Man-Kay Law, Pui-In Mak, Rui P. Martins

Author information

Xiongjie Zhang
State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, and the Faculty of Science and Technology - ECE, University of Macau
Qiaobo Ma
State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, and the Faculty of Science and Technology - ECE, University of Macau
Yang Jiang
State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, and the Faculty of Science and Technology - ECE, University of Macau
Man-Kay Law
State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, and the Faculty of Science and Technology - ECE, University of Macau
Pui-In Mak
State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, and the Faculty of Science and Technology - ECE, University of Macau
Rui P. Martins
State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, and the Faculty of Science and Technology - ECE, University of Macau
Instituto Superior Técnico, Universidade de Lisboa

Keywords: hybrid buck converter, zero-voltage switching, high step-down, dual-path, DCR loss reduction

JOURNAL FREE ACCESS

2021 Volume 18 Issue 22 Pages 20210382

DOI https://doi.org/10.1587/elex.18.20210382

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Abstract

This paper proposes a direct 12V-to-1V hybrid converter using a switched-capacitor-assisted (SCA) topology, featuring dual-path output current conduction to lower the inductor current. In contrast to the existing dual-path structures, the proposed topology realizes a high step-down conversion with efficiency improvement in heavy-load conditions. Besides, the converter further achieves an efficiency boost in light-load conditions using zero-voltage switching. Designed in a 180-nm SOI BCD process, the proposed converter regulates an output of 0.7∼1.3V from a 12-V input with a peak efficiency of 92%. Under a loading current of 2A, it attains an efficiency over 84% at the 1-V output. Compared with the conventional buck, it achieves an improvement of 9.8% in peak efficiency and 13.6% in maximum-loading efficiency.

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