A multi-path switched-capacitor-inductor hybrid DC-DC converter with reduced inductor loss and extended voltage conversion range

IEICE Electronics Express

article

Qiaobo Ma¹  Xiongjie Zhang¹  Yang Jiang¹  Katsuhiro Hata²  Makoto Takamiya²  Man-Kay Law¹  Pui-In Mak¹  Rui P. Martins¹ 

[1] State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, and the Faculty of Science and Technology - ECE, University of Macau;Institute of Industrial Science, The University of Tokyo;Instituto Superior Técnico, Universidade de Lisboa

关键词: DC-DC converter;    DCR loss;    hybrid topology;    multi-path;    switched-capacitor;    voltage conversion range;   

DOI  :  10.1587/elex.18.20210405

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

This work proposes a hybrid DC-DC converter using a multi-path switched-capacitor-inductor (MPSCI) topology. Assisted by switched-capacitor branches, it features voltage-conversion range extension and inductor power loss reduction, and hence improving the conversion efficiency. Implemented in a 180-nm CMOS process, the proposed converter can regulate an output voltage of 1.8∼3.3V from a 5-V input bus voltage using a 4.7μH inductor (DCR =240mΩ) at a switching frequency of 800kHz. It achieves a peak conversion efficiency of 93.7% when delivering an output current of 1A. Under a maximum loading of 3A, this design still attains an efficiency of up to 85.8%. Furthermore, in contrast to the existing dual-path and conventional buck topologies, the proposed converter realizes an inductor loss reduction up to 3.3 and 5.4 times, respectively, at the maximum loading conditions.

【 授权许可】

CC BY