A High-Efficiency Single-Mode Dual-Path Buck-Boost Converter With Reduced Inductor Current

Donghee Cho, Hyungjoo Cho, Sein Oh, Yoontae Jung, Sohmyung Ha, Chul Kim, Minkyu Je

Research output: Contribution to journalArticlepeer-review


This article presents a single-mode dual-path buck-boost converter (SDBBC) for mobile devices powered by lithium-ion batteries. Unlike the conventional buck-boost converter (CBBC), this SDBBC conducts buck and boost operations using a hybrid structure with two flying capacitors (CF1 , C F2 ) and one inductor. This hybrid structure eliminates any mode transition between circuit configurations, covering both the buck and boost operations continuously within a single-mode operation. By consistently connecting the inductor to the load with a secondary path formed by C F1 and C F2 , the average of the inductor current (I L ) is always smaller than the load current (ILOAD) across all the output voltage conversion ratios, thus incurring low conduction loss and switch transition loss. Also, the current delivered to the load increases as the duty ratio increases, so the right half-plane (RHP) zero is removed. Therefore, the proposed SDBBC achieves high power efficiency seamlessly across the whole conversion range, 94.8% peak efficiency is achieved even with an inductor of 175 mΩ dc resistance (DCR), and 95.58% efficiency is achieved in the boost operation at a heavy load current of 1 A using a large size inductor with 19 mΩ DCR.

Original languageEnglish (US)
Pages (from-to)720-731
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Issue number3
StatePublished - Mar 1 2023


  • Buck-boost converter (BBC)
  • hybrid dc-dc converter
  • inductor current reduction
  • right half-plane (RHP) zero removal
  • single-mode dual-path buck-boost converter (SDBBC)
  • small-size inductor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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