Patent ID: 8908399

Claim:
A device comprising: a charge pump voltage generator having first and second inputs and a plurality of charge stages; and a regulation device configured to regulate an output voltage of said charge pump voltage generator, and comprising a first regulation loop configured to generate and deliver to the first input of the charge pump voltage generator, an input voltage that is based upon a difference between the output voltage and a first reference voltage, a charge pump voltage supply having an input configured to receive a supply voltage that varies between a low value and a high value, and configured to generate and deliver, to the second input of the charge pump voltage generator, a constant charge voltage while the charge pump voltage generator is operated, the constant charge voltage having a value that is lower than the low value of the supply voltage, the supply voltage not feeding said charge pump voltage generator, and the output voltage being regulated by the input voltage independent of an oscillator of said charge pump voltage generator, and a second regulation loop configured to deliver a command to said charge pump voltage supply based upon a difference between the constant charge voltage and a second reference voltage, a product of a number of the plurality of charge stages and the second reference voltage being less than the output voltage.