An efficient 2-stage fractional charge pump based on frequency regulation

A. Saiz-Vela; P. Miribel-Catala; M. Puig-Vidal; J. Samitier

doi:10.1117/12.608274

30 June 2005 An efficient 2-stage fractional charge pump based on frequency regulation

A. Saiz-Vela, P. Miribel-Catala, M. Puig-Vidal, J. Samitier

Proceedings Volume 5837, VLSI Circuits and Systems II; (2005) https://doi.org/10.1117/12.608274
Event: Microtechnologies for the New Millennium 2005, 2005, Sevilla, Spain

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.

Citation Download Citation

A. Saiz-Vela, P. Miribel-Catala, M. Puig-Vidal, and J. Samitier "An efficient 2-stage fractional charge pump based on frequency regulation", Proc. SPIE 5837, VLSI Circuits and Systems II, (30 June 2005); https://doi.org/10.1117/12.608274

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