Patent ID: 8699247
Filing Date: 2014-04-15
Classification: G11C,H02M

Abstract:
1. A charge pump system connected to receive an input voltage and generate therefrom first and second regulated output voltages respectively at first and second output nodes, comprising: a first charge pump connected to receive the input voltage and provide at the first output node an output voltage generated therefrom; a second charge pump connected to provide at a second output voltage at the second output node and connectable to receive the input voltage; a third charge pump connectable to receive the input voltage; a first switch, whereby the output of the third charge pump is connectable to the first output node; a set of second switches, whereby the output of the first charge pump can be supplied to the third charge pump and the output of the third charge pump can be supplied to the second charge pump; a first regulation circuit connected to receive the voltage at the first output node; a second regulation circuit connected to receive the voltage at the second output node; and control circuitry connected to the first and second switches whereby the charge pump system can be operated in one of a first or a second mode, where, in the first mode, the first switch is on and the second switches are off so that the first and third charge pumps are connected in parallel to generate the output voltage at the first output node from the input voltage and be regulated by the first regulation circuit at the first regulated output voltage and the second charge pump generates the output voltage at the second output node from the input voltage and is regulated by the second regulation circuit at the second regulated output voltage, and where, in second mode, the first switch is off and the second switches are on so that the first charge pump generates the output voltage at the first output node from the input and is regulated by the first regulation circuit at the first regulated output voltage and the third and second charge pumps are connected in series to generate the output voltage at the second output node from the first output voltage and be regulated by the second regulation circuit at the second regulated output voltage, wherein the second regulated output voltage is higher than the first regulated output voltage, and the second regulated output voltage is higher in the second mode than in the first mode.