A 0.05-to-3.1A 585mA/mm3 97.3%-Efficiency Outphase Switched-Capacitor Hybrid Buck Converter with Relieved Capacitor Inrush Current and COUT-Free Operation

doi:10.23919/VLSITechnologyandCir57934.2023.10185256

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	A 0.05-to-3.1A 585mA/mm3 97.3%-Efficiency Outphase Switched-Capacitor Hybrid Buck Converter with Relieved Capacitor Inrush Current and COUT-Free Operation
	Xiongjie Zhang1,2 ; Qiaobo Ma1,2 ; Anyang Zhao1 ; Yang Jiang1,2 ; Man-Kay Law1,2 ; Pui-In Mak 1,2; Rui Martins 1,2,3
	2023-07-04
Conference Name	2023 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)
Source Publication	Digest of Technical Papers - Symposium on VLSI Technology
Volume	2023-June
Conference Date	11-16 June 2023
Conference Place	Kyoto, Japan
Country	Japan
Publisher	Institute of Electrical and Electronics Engineers Inc.
Abstract	This work presents a hybrid buck converter with improved heavy-and-light load efficiency and enhanced power (current) density. The proposed converter uses outphase-interleaved switched-capacitor (OISC) cells to relieve the flying capacitor (CF) inrush current under extreme duty-ratios (D). It can also operate without an output capacitor (COUT), improving the overall form factor. Besides, the intrinsic topological property realizes inductor-current recycling, which boosts the light-load efficiency without discontinuous-conduction mode (DCM) control. We also propose a self-hold gate driving scheme using a shared charge pump to eliminate the off-chip bootstrapping capacitors (CBST). Fabricated in 180-nm BCD, the prototype supports a wide-range load current (ILOAD) of 0.05-3.1A and converts a 1.8-3.3V input to a 0.8-1.8V output with a peak efficiency of 97.3%, and a peak current density of 585mA/mm3. With zero COUT, the measured output ripple is below 60mV at 1.8VOUT and 3.1A ILOAD.
DOI	10.23919/VLSITechnologyandCir57934.2023.10185256
URL	View the original
Indexed By	SCIE
Scopus ID	2-s2.0-85167616156
Fulltext Access	View Full-Text via DOI
Citation statistics
Document Type	Conference paper
Collection	INSTITUTE OF MICROELECTRONICS
Corresponding Author	Yang Jiang
Affiliation	1.State Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, University of Macau, Macao 2.ECE Department, Faculty of Science and Technology, University of Macau, Macao 3.On leave from Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal
First Author Affilication	University of Macau; Faculty of Science and Technology
Corresponding Author Affilication	University of Macau; Faculty of Science and Technology
Recommended Citation GB/T 7714	Xiongjie Zhang,Qiaobo Ma,Anyang Zhao,et al. A 0.05-to-3.1A 585mA/mm3 97.3%-Efficiency Outphase Switched-Capacitor Hybrid Buck Converter with Relieved Capacitor Inrush Current and COUT-Free Operation[C]:Institute of Electrical and Electronics Engineers Inc., 2023.
APA	Xiongjie Zhang., Qiaobo Ma., Anyang Zhao., Yang Jiang., Man-Kay Law., Pui-In Mak., & Rui Martins (2023). A 0.05-to-3.1A 585mA/mm3 97.3%-Efficiency Outphase Switched-Capacitor Hybrid Buck Converter with Relieved Capacitor Inrush Current and COUT-Free Operation. Digest of Technical Papers - Symposium on VLSI Technology, 2023-June.

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