Merged Two-Stage Power Converter With Soft Charging Switched-Capacitor Stage in 180 nm CMOS

Author

Pilawa-Podgurski, Robert C N ; Perreault, David J.

Author_Institution

Massachusetts Inst. of Technol., Cambridge, MA, USA

Volume

47

Issue

7

fYear

2012

fDate

7/1/2012 12:00:00 AM

Firstpage

1557

Lastpage

1567

Abstract

In this paper, we introduce a merged two-stage dc-dc power converter for low-voltage power delivery. By separating the transformation and regulation function of a dc-dc power converter into two stages, both large voltage transformation and high switching frequency can be achieved. We show how the switched-capacitor stage can operate under soft charging conditions by suitable control and integration (merging) of the two stages. This mode of operation enables improved efficiency and/or power density in the switched-capacitor stage. A 5-to-1 V, 0.8 W integrated dc-dc converter has been developed in 180 nm CMOS. The converter achieves a peak efficiency of 81%, with a regulation stage switching frequency of 10 MHz.

Keywords

CMOS analogue integrated circuits; DC-DC power convertors; switched capacitor networks; CMOS technology; efficiency 81 percent; frequency 10 MHz; integrated DC-DC converter; low-voltage power delivery; power 0.8 W; power density; size 180 nm; soft charging condition; soft charging switched-capacitor stage; switching frequency; two-stage DC-DC power converter; voltage 5 V to 1 V; voltage transformation; Capacitors; Logic gates; Switches; Switching frequency; Transistors; Voltage control; Buck converter; CMOS power delivery; DC-DC converter; feed-forward; merged two-stage; power management; soft charging; switched capacitor converter;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2012.2191325

Filename

6193182