Patent ID: 8519777

Claim:
A method for generating from a single supply voltage Vdd output voltages in three modes by a charge pump, comprising the following steps: (1) providing an input voltage Vdd and a charge pump circuit, having a positive and a negative output port, comprising a digital controller, a set of eight switches, only one flying capacitor, and two reservoir capacitors; (2) setting output voltage modes desired on the digital controller, wherein the possible output modes comprise doubler, inverter, or half the input supply voltage; (3) setting switches in order to put voltages on the flying capacitor and on the output ports according to a switching sequence and phases required for the output mode selected, wherein the switching sequences comprise not more than two phases; (4) check if the charge pump is still on, if it so, the process flow goes to step (5), else the process flow goes to step 7; (5) check if the process will be continued with the actual output voltage mode, if it so, the process flow will go back to step (3), else the process flow goes to step (6); (6) setting output voltage mode as required and go to step (3); and (7) end of operation.