Patent ID: 6147547
Filing Date: 2000-11-14
Classification: H02M

Abstract:
A charge pump circuit provided on a semiconductor substrate, comprising:a first power supply node receiving a first power supply potential;a second power supply node receiving a second power supply potential being lower than said first power supply potential;a pumping portion having a first and a second internal nodes, driven by a clock signal and rendering the potential of said second internal node higher than that of a first internal node;said pumping portion including:a first poly-diode element so provided as to have a forward direction from said first internal node toward said second internal node,a second poly-diode element having said forward direction and serially connected to said first poly-diode element, anda capacitor having a first electrode being connected to a connection node between said first and second poly-diode elements and a second electrode being supplied with said clock signal,a first output node to be supplied with a first output potential being lower than said second power supply potential by said pumping portion;a second output node to be supplied with a second output potential being higher than said first power supply potential by said pumping portion; anda operation mode switching circuit controlling a supply of potentials to said first internal node, said second internal node, said first output node and said second output node,said operation mode switching circuit supplying said second power supply potential to said second internal node and outputting said first output potential from said first internal node to said first output node in a first operation mode while supplying said first power supply potential to said first internal node and outputting said second output potential from said second internal node to said second output node in a second operation mode.