A New Approach to Reducing Output Ripple in Switched-Capacitor-Based Step-Down DC–DC Converters

Author

Han, Jifeng ; Von Jouanne, Annette ; Temes, Gabor C.

Author_Institution

Freescale Semicond. Inc., Ridgeland, MS

Volume

21

Issue

6

fYear

2006

Firstpage

1548

Lastpage

1555

Abstract

Rapidly dropping power supply voltages and tight voltage regulation requirements for integrated circuits challenges power supply designers. A novel interleaved discharging (ID) approach is presented to reduce the output ripple in step-down switched-capacitor (SC) dc-dc converters. Simulation and experimental results of a four-stage SC dc-dc converter show that the ID approach can reduce the output ripple by a factor of three. The proposed approach also improves the converter efficiency by 7%. The ID method provides flexibility in the design optimization of step-down SC dc-dc converters

Keywords

DC-DC power convertors; capacitor switching; integrated circuits; switching convertors; voltage control; design optimization; interleaved discharging approach; output ripple reduction; power supply voltages; step-down dc-dc converters; switched capacitor; voltage regulation; Application software; Capacitors; Circuit simulation; Costs; Interleaved codes; Magnetic separation; Power supplies; Switching circuits; Switching converters; Voltage; Integrated circuits (ICs); interleaved discharging (ID); switched-capacitor (SC);

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2006.882973

Filename

4012140