Charge-pump circuit and control method thereof

A charge-pump circuit comprising:

• at least first and second MOS transistors for charge transfer connected in series;
• plural capacitors;
• clock supplying means supplying clock to these plural capacitors;
• first switching means for connecting said plural capacitors to a connecting point of the first and second MOS transistors for charge transfer in series;
• and
• second switching means or connecting said plural capacitors to the connecting point of the first and second MOS transistors for charge transfer in parallel,
• wherein said clock supplying means changes the state of said clock while said first and second switching means are turned off.

A charge-pump circuit comprising:

• plural MOS transistors for charge transfer connected in series;
• plural capacitors connected to a connecting point of said plural MOS transistors for charge transfer;
• and
• clock supplying means supplying clock to said plural capacitors,
• wherein the plural capacitors include at least first and second capacitors,
• the charge-pump circuit further comprises:
• first switching means for connecting the first and second capacitors to a connecting point of said MOS transistors for charge transfer in series;
• second switching means for connecting the first and second capacitors to the connecting point of said MOS transistors for charge transfer in parallel, and
• wherein said clock supplying means changes the sate of said clock while said first and second switching means are turned off.

A control method of charge-pump circuit comprising:

• at least first and second MOS transistors for charge transfer connected in series;
• first and second capacitors;
• clock supplying means supplying clock to one end of the second capacitor;
• first switching means f or connecting said first and second capacitors to a connecting point of the first and second MOS transistors for charge transfer in series;
• and second switching means for connecting said first and second capacitors to the connecting point of the first and second MOS transistors for charge transfer in parallel,
• said control method comprising a step of changing the state of said clock by said clock supplying means after said first and second switching means are turned off.

A control method of charge-pump circuit comprising:

• at least first and second MOS transistors for charge transfer connected in series;
• plural capacitors;
• clock supplying means supplying clock to these plural capacitors;
• first switching means for connecting said plural capacitors to a connecting point of the first and second MOS transistors for charge transfer in series;
• and second switching means for connecting said plural capacitors to the connecting point of the first and second MOS transistors for charge transfer in parallel,
• said control method comprising a step of changing the state of said clock by said clock supplying means after said first and second switching means are turned off.