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Proceedings Paper

A 100mA fractional step-down charge pump with digital control
Author(s): Valter A. L. Sadio; Abílio E. M. Parreira; Marcelino B. Santos
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Paper Abstract

A switched capacitor step-down DC-DC converter (charge pump) is proposed. High efficiency is achieved by combination of fractional conversion ratios (different step-down modes of operation), output voltage sensing and pulse skipping based digital control techniques. Two control techniques were implemented with automatic change between modes and their results are discussed and compared. The power module has 9 switches, implemented with 14 power transistors, and a current limit circuit to mitigate the in-rush current in startup phase. This circuit has been designed in AMS C35B4 (0.35um) CMOS process. The charge pump was designed to provide a maximum load current of 100mA. The peak-to-peak output voltage ripple is less than 30mV with two 3uF flying capacitors and one 20uF output capacitor. Peak and average efficiencies, with maximum load current, are over 80% and 68%, respectively.

Paper Details

Date Published: 28 May 2009
PDF: 12 pages
Proc. SPIE 7363, VLSI Circuits and Systems IV, 73630U (28 May 2009); doi: 10.1117/12.822917
Show Author Affiliations
Valter A. L. Sadio, Instituto Superior Técnico (Portugal)
INESC-ID (Portugal)
Abílio E. M. Parreira, INESC-ID (Portugal)
Marcelino B. Santos, Instituto Superior Técnico (Portugal)
INESC-ID (Portugal)
Silicon Gate (Portugal)

Published in SPIE Proceedings Vol. 7363:
VLSI Circuits and Systems IV
Teresa Riesgo; Eduardo de la Torre; Leandro Soares Indrusiak, Editor(s)

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