Paper Info
Title
Reconfigurable Switched-Capacitor Dc-Dc Converter With Adaptive Switch Modulation And Frequency Scaling Techniques
Abstract
A switched-capacitor (SC) step-down DC-DC converter reconfiguring its open-loop topology based on the input voltage to resolve the efficiency issue of single topology is presented in this paper. An adaptive switch modulation (ASM) technique, modulating switch width of the power stage, and a frequency scaling (FS) technique, scaling the sampling rate of the PFM controller, are also proposed to reduce the quiescent current of the converter for light-load efficiency. The prototype converter in 0.25-mu m CMOS process with integrated flying capacitors generates a fixed regulated output voltage of 1.8V from an input voltage ranging from 3V to 4.2V. Experimental results show that the gate driving loss and the PFM controller power are decreased by more than 70% with the ASM and FS techniques. The light-load efficiencies are enhanced by 7% and 10% when the input voltage is 3V and 4V, respectively. The transient response time is about 500ns after a step current from 50 mu A to 10mA. Its power efficiency is high than 70% over a wide load current range with a peak value of 83%.
Year
DOI
Venue
2021
10.1109/ISCAS51556.2021.9401096
2021 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS)
Keywords
DocType
ISSN
Reconfigurable switched-capacitor DC-DC converter, low quiescent current, light-load efficiency
Conference
0271-4302
Citations 
PageRank 
References 
0
0.34
0
Authors
3
Name
Order
Citations
PageRank
Tun-Yen Liao100.34
Hsin-shu Chen29316.12
Wen-Jong Wu394.17