DocumentCode :
58824
Title :
A High-Efficiency Wide-Input-Voltage Range Switched Capacitor Point-of-Load DC–DC Converter
Author :
Ng, Vincent W. ; Sanders, S.R.
Author_Institution :
Volterra Semicond., Fremont, CA, USA
Volume :
28
Issue :
9
fYear :
2013
fDate :
Sept. 2013
Firstpage :
4335
Lastpage :
4341
Abstract :
The traditional inductor-based buck converter has been the default design for switched-mode voltage regulators for decades. Switched capacitor (SC) dc-dc converters, on the other hand, have traditionally been used in low-power (<;10 mW) and low conversion ratio (<;4:1) applications where neither regulation nor efficiency is critical. This study encompasses the complete successful design, fabrication, and test of a CMOS-based SC dc-dc converter, addressing the ubiquitous 12-1.5 V boardmounted point-of-load application. In particular, the circuit developed in this study attains higher efficiency (92% peak, and >80% over a load range of 5 mA to 1 A) than surveyed competitive buck converters, while requiring less board area and less costly passive components. The topology and controller enable a wide input range of 7.5-13.5 V. Controls based on feedback and feedforward provide tight regulation under worst case line and load step conditions. This study shows that the SC converter can outperform the buck converter, and thus, the scope of SC converter application can and should be expanded.
Keywords :
CMOS integrated circuits; DC-DC power convertors; low-power electronics; network topology; switched capacitor networks; CMOS-based SC DC-DC converter; current 5 mA to 1 A; high-efficiency wide-input-voltage range switched capacitor point-of-load DC-DC converter; inductor-based buck converter; switched-mode voltage regulators; voltage 12 V to 1.5 V; Capacitors; Clocks; Switches; Switching frequency; Voltage control; Voltage measurement; DC-DC power converters; switched capacitor circuits; switched-mode power supply;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2012.2224887
Filename :
6334460
Link To Document :
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