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

fYear

2011

fDate

12-16 Sept. 2011

Firstpage

479

Lastpage

482

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 control bandwidth 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 integrated circuits; DC-DC power convertors; switched capacitor networks; CMOS integrated circuits; frequency 10 MHz; high control bandwidth; integrated dc-dc converter; large voltage transformation; low-voltage power delivery; power 0.8 W; power density; regulation function; regulation stage switching frequency; size 180 nm; soft charging conditions; soft charging switched-capacitor stage; transformation function; two-stage dc-dc power converter; voltage 1 V; voltage 5 V; Capacitors; Logic gates; Switches; Switching frequency; Transistors; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

ESSCIRC (ESSCIRC), 2011 Proceedings of the

Conference_Location

Helsinki

ISSN

1930-8833

Print_ISBN

978-1-4577-0703-2

Electronic_ISBN

1930-8833

Type

conf

DOI

10.1109/ESSCIRC.2011.6045011

Filename

6045011