Patent ID: 9685855
Date: 2017-06-20
CPC Classifications: H02M,H03F,H03G

Claim:
1. A charge pump circuit comprising: an input node for receiving an input voltage; first and second output nodes for connection to first and second reservoir capacitors and for outputting first and second output voltages respectively; a plurality of flying capacitor nodes; a network of switches for interconnecting said nodes; and a controller for operating said switches, said controller being operable in a first mode to operate said switches in a sequence of states so as to generate said first and second output voltages wherein, in said first mode, said first and second output voltages are of opposite polarity to one another and each substantially equal in magnitude to a fraction of said input voltage; wherein said sequence of states includes a first state of the first mode in which a flying capacitor connected to the flying capacitor nodes is connected in series with the first reservoir capacitor, wherein the circuit further comprises an input selector for receiving, in use, a plurality of different voltage inputs and operable to select one of said plurality of different voltage inputs as said input voltage received at the input node.