98.1%-Efficiency Hysteretic-Current-Mode Noninverting Buck-Boost DC-DC Converter With Smooth Mode Transition

Xiang En Hong, Jian Fu Wu, Chia Ling Wei

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


A noninverting buck-boost dc-dc converter can work in buck, boost, or buck-boost mode. Hence, it provides a good solution when the input voltage may be higher or lower than the output voltage. However, a buck-boost converter requires four power transistors, rather than two. Therefore, its efficiency decreases, due to the conduction and switching losses of the two extra power transistors. Another issue of a buck-boost converter is how to smoothly switch its operational mode, when its input voltage approaches its output voltage. A hysteretic-current-mode noninverting buck-boost converter with high efficiency and smooth mode transition is proposed, and it was designed and fabricated using TSMC 0.35-μm CMOS 2P4 M 3.3 V/5V mixed-signal polycide process. The input voltage may range from 2.5 to 5 V, the output voltage is 3.3 V, and the maximal load current is 400 mA. According to the measured results, the maximal efficiency reaches 98.1%, and the efficiencies measured in the entire input voltage and loading ranges are all above 80%.

Original languageEnglish
Article number7469400
Pages (from-to)2008-2017
Number of pages10
JournalIEEE Transactions on Power Electronics
Issue number3
Publication statusPublished - 2017 Mar

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


Dive into the research topics of '98.1%-Efficiency Hysteretic-Current-Mode Noninverting Buck-Boost DC-DC Converter With Smooth Mode Transition'. Together they form a unique fingerprint.

Cite this