Voltage regulator based on an high-efficiency adaptive charge pump

In this paper, both a charge pump which changes its number of stages to achieve the minimum power consumption and a regulated voltage reference based on it is presented. The charge pump can modifies the number of stages from 1 to 3 through a proper assigning of the clock phases, and it uses the same amount of capacitance (i.e., silicon area) in all the topologies. The voltage regulator, based on the adaptive charge pump can dynamically select the equivalent stage behavior to maximize the power efficiency under power supply changes. The behavior of the circuits were confirmed through Eldo simulation using a 0.35 /spl mu/m CMOS EEPROM technology.