Integrated Circuits and Systems >

2025 , Vol. 2 >Issue 3: 110 - 121

DOI: https://doi.org/10.23919/ICS.2025.3582894

Regular Papers

A Single-Inductor-Dual-Output Buck/Boost/Buck-Boost Converter for Wearable Devices

  • FEI LIU 1 ,
  • LANGYUAN WANG 2 ,
  • SHUYU ZHANG 2 ,
  • HANLU ZHANG 2 ,
  • NA YAN , 1
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  • 1 State Key Laboratory of Integrated Chip and Systems, Fudan University, Shanghai 200433, China
  • 2 Common Mode (GONGMO) Semiconductor Company Ltd., Suzhou 215100, China
NA YAN (e-mail: )

FEI LIU received the B.S. degree in microelectronics science and engineering in 2022 from Fudan University, Shanghai, China, where she is currently working toward the M.S. degree. Her research interests include high-performance linear and switching power converter and reference.

LANGYUAN WANG (Member, IEEE) received the B.S. degree in electronics engineering from the University of Electronic Science and Technology of China, Chengdu, China, in 2007, and the M.S. and Ph.D. degrees in circuits and systems from Zhejiang University, Hangzhou, China, in 2010 and 2017, respectively. From 2010 to 2013, he was an Analog Design Engineer with Analog Devices Inc., Shanghai, China. He is currently the Design Director with CommonMode (GONGMO) Semiconductor Company, Ltd, Suzhou, China. His research interests include high-performance linear and switching power converter, reference, precision amplifier and data converter.

SHUYU ZHANG (Member, IEEE) received the B.S. and Ph.D. degrees in circuits and systems from Zhejiang University, Hangzhou, China, in 2014 and 2019, respectively. From 2018 to 2019, he was a Visiting Scholar with Department of Electrical and Computer Engineering, University of Texas at Dallas, Dallas, TX, USA.From 2019 to 2022, he was with Analog Device Inc., Shanghai, China, as a Senior Analog Design Engineer. In 2022, he was with Common Mode (GONGMO) Semiconductor Company, Ltd., Suzhou, China, where he is currently a Staff IC Design Engineer. His research interests include design and modeling of power management systems, especially lowpower regulators, multi-phase power converters, and COT-controlled power converters.

HANLU ZHANG received the B.S. degree in electrical engineering from the East China University of Science and Technology, Shanghai, China, in 2019, and the M.S. degree in electrical engineering from the University of New South Wales, Sydney, NSW, Australia, in 2022. He is currently an Analog Design Engineer with CommonMode (GONGMO) Semiconductor Comapny, Ltd., Suzhou, China. His research focuses on highperformance switching power converters.

NA YAN (Member, IEEE) received the B.S. and Ph.D. degrees from Fudan University, Shanghai, China, in 2002 and 2007, respectively. From 2011 to 2012, she was a Visiting Scholar with the University of California at Los Angeles, Los Angeles, CA, USA, where she was involved in millimeterwave transceiver and RF interconnect transceiver design. She joined the School of Microelectronics, Fudan University, where she is currently a Full Professor. She has authored or coauthored more than 100 refereed publications, including one chapter in RF mixed-signal circuit design resulting in more than 20 patents. Her research focuses on power-efficient mixed-signal circuits’ design for highly integrated CMOS RF systems.

Received date: 2025-01-31

  Revised date: 2025-03-25

  Accepted date: 2025-06-20

  Online published: 2025-10-22

Supported by

National Natural Science Foundation of China under Grant 62434003 and Grant(92473109)

in part by Common Mode (GONGMO) Semiconductor Co., Ltd.

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Abstract

This paper presents a single-inductor-multiple-output (SIMO) buck/boost/buck-boost converter for wearable electronic devices.Aiming at high light-load efficiency and low ripple, the converter applies fully asynchronous burst mode control. The circuit enters sleep mode intermittently during light loads, significantly reducing static power consumption. The peak inductor current is fixed, effectively limiting the maximum output ripple. The converter features three conversion modes: buck, boost, and auto-gain buck-boost. DC analysis is conducted to derive expressions for output ripple and maximum load in relation to the peak inductor current. AC stability analysis is performed with small signal perturbation and linearization methods, proving the stability of all three modes. Measured results indicate that the converter achieves a peak efficiency of 91.0% at an output power of 77.5 mW. The maximum output ripple is 27.0 mV, and the overshoot or undershoot during load transients is not observed. Compared with existing converters, it exhibits higher efficiency and lower ripple, along with a fast load transient response, offering a highly efficient power management solution for wearable devices.

Key words： SIMO DC-DC converter; DCM-TM control; PFM; load transient response; stability

Cite this article

FEI LIU , LANGYUAN WANG , SHUYU ZHANG , HANLU ZHANG , NA YAN . A Single-Inductor-Dual-Output Buck/Boost/Buck-Boost Converter for Wearable Devices[J]. Integrated Circuits and Systems, 2025 , 2(3) : 110 -121 . DOI: 10.23919/ICS.2025.3582894

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