A Low-Ripple Switched-Capacitor DC-DC up Converter for Low-Voltage Applications

Seung-Chul LEE  Seung-Hoon LEE  

IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.8   pp.1100-1103
Publication Date: 2001/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
DC-DC converter,  switched capacitor,  

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This paper describes a switched-capacitor type DC-DC up converter with high efficiency and low-ripple voltage. Identical charge pumps operating sequentially in the proposed DC-DC converter reduce the magnitude of the ripple voltage to 20% of the conventional converters. A new charge pump adopting PMOS switches near the output stage improves the power efficiency of the DC-DC converter by 10%. The proposed DC-DC converter is applied, as a test vehicle, to a phase-locked loop circuit which is sensitive to power supply noise. All circuits are fabricated and measured in a 0.65-µm CMOS process.