A Dual-Ring Switched-Capacitor DC-DC Converter With Systematic Fractional Conversion Ratios

Yifan Jiang1; Junmin Jiang2; Yan Lu1

10.1109/ISCAS46773.2023.10181605

2023

0271-4302

978-1-6654-5110-9

2023 IEEE International Symposium on Circuits and Systems (ISCAS)

2023-May

1-4

21-25 May 2023

Monterey, CA, USA

This paper presents a fully-integrated reconfigurable dual-ring switched-capacitor (DRSC) converter that overcomes the coarse output voltage resolution limitation of traditional switched-capacitor (SC) converters. The proposed DRSC converter cascades multiple stages of SC cells and achieves a fine voltage conversion ratio resolution from 1/n to (n-1)/n, where n is the number of phases. To improve efficiency, the bottom-plate parasitic loss is mitigated by the charge redistribution technique. Also, the power switches are divided into several segmentation groups to reduce the output ripple with different loads. This work is designed in a 180nm CMOS process with 30 cascaded reconfigurable SC power cells. It achieves a wide output voltage range of 0.5-3.3V from a battery input voltage (2.7-4.2V). The load regulation is implemented with a pulse-frequency modulation (PFM) control. The simulated peak efficiency is 78%, with a load current range of 0 to 20mA, using 1.5nF on-chip capacitors in total.

converter-ring DC-DC dual-ring switched-capacitor power converter fractional ratios charge redistribution

其他

CPCI-S ; EI

WOS:001038214601026

20233314552511

DC-DC converters

Electric Components:704.1 ; Production Engineering:913.1

IEEE

1.State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macao, China
2.Department of Electronic and Electrical Engineering, Southern University of Science and Technology, Shenzhen, China

Yifan Jiang,Junmin Jiang,Yan Lu. A Dual-Ring Switched-Capacitor DC-DC Converter With Systematic Fractional Conversion Ratios[C],2023:1-4.