Charge pump circuits and devices containing such

摘要

Circuits to convert an input voltage supply to an output voltage supply having a different magnitude or polarity. The circuits include a capacitor having a first terminal and a second terminal, a first switch coupled to the first terminal of the capacitor, and a second switch. The circuits further include a first node coupled between the second terminal of the capacitor and the second switch, and a third switch having a first terminal coupled to the first node and a second terminal coupled to a second node. The first switch is adapted to couple the first terminal of the capacitor to the input supply voltage during a fill state and a second voltage level during a dump state. The second switch is adapted to couple the first node to a third voltage level during the fill state and present a high impedance to the first node during the dump state. The third switch is adapted to dump a charge from the first node to the second node during the dump state, thereby producing an output voltage at the second node.