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30 June 2005 An efficient 2-stage fractional charge pump based on frequency regulation
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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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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