IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543

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A multi-path switched-capacitor-inductor hybrid DC-DC converter with reduced inductor loss and extended voltage conversion range
Qiaobo MaXiongjie ZhangYang JiangKatsuhiro HataMakoto TakamiyaMan-Kay LawPui-In MakRui P. Martins
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JOURNAL FREE ACCESS Advance online publication

Article ID: 18.20210405

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Abstract

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 800 kHz. 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.

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