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Proceedings Paper

An efficient 2-stage fractional charge pump based on frequency regulation
Author(s): A. Saiz-Vela; P. Miribel-Catala; M. Puig-Vidal; J. Samitier
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Paper Abstract

An efficient 2-stage charge pump based on two-phase voltage doublers is proposed in this paper. Pulse skipping frequency regulators have been used to obtain a high efficiency over a wide range of loads. Since this charge pump has been designed for battery-powered portable devices, a power-up control system that combines a linear and a switched charging sequence has been included in each stage in order to avoid great current spikes at the beginning of the start-up process that could damage or shorten the battery life. The result is a power efficient 2-stage charge pump capable to generate a maximum regulated output voltage up to 10V from a 2.7V-3.3V battery source and deliver a maximum power of 100mW. If it is desired, the regulated output voltage can be downscaled to a required lower regulated voltage through a simple programming method using external resistors plus internal digital circuitry. This circuit has been designed using a 0.7μI2T technology from AMI semiconductor.

Paper Details

Date Published: 30 June 2005
PDF: 8 pages
Proc. SPIE 5837, VLSI Circuits and Systems II, (30 June 2005); doi: 10.1117/12.608274
Show Author Affiliations
A. Saiz-Vela, Univ. de Barcelona (Spain)
P. Miribel-Catala, Univ. de Barcelona (Spain)
M. Puig-Vidal, Univ. de Barcelona (Spain)
J. Samitier, Univ. de Barcelona (Spain)

Published in SPIE Proceedings Vol. 5837:
VLSI Circuits and Systems II
Jose Fco. Lopez; Francisco V. Fernandez; Jose Maria Lopez-Villegas; Jose M. de la Rosa, Editor(s)

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