Patent ID: 7843446
Filing Date: 2010-11-30
Classification: G09G,H02M

Abstract:
1. A DC-DC converting circuit comprising: a charge pumping part receiving an input voltage, a first clock and a second clock having a phase different than a phase of the first clock to output a first voltage boosted by a high voltage of the first clock with respect to the input voltage during a high period of the first clock and output a second voltage boosted by a high voltage of the second clock with respect to the input voltage during a high period of the second clock; an output part outputting the first voltage from the charge pumping part to an output terminal during a low period of the second clock and outputting the second voltage from the charge pumping part to the output terminal during a low period of the first clock; and a level boosting part providing an output voltage or a ground voltage from the output terminal to the charge pumping part to turn on or to turn off the charge pumping part in response to the first clock and the second clock, wherein the charge pumping part comprises: a first flying capacitor having a first terminal receiving the first clock and a second terminal connected to the first node, the first flying capacitor boosting an electric potential of the first node to the first voltage during the high period of the first clock; a second transistor having an input electrode receiving the first voltage, a control electrode connected to the level boosting part and an output electrode connected to a second node, the second transistor outputting the input voltage in response to the turn-on signal from the level boosting part during the low period of the second clock; and a second flying capacitor having a first terminal receiving the second clock and a second terminal connected to the second node, the second flying capacitor boosting an electric potential of the second node to the second voltage during the high period of the second clock.