Semiconductor integrated circuit including charge pump circuit

A semiconductor integrated circuit comprising:

• a charge pump circuit that is connected to a first capacitor and a second capacitor, charges the first capacitor with an input voltage, transfers a charge accumulated in the first capacitor to the second capacitor, outouts, as an output voltage, a voltage of the second capacitor, and is capable of changing over a capability of charging the first or second capacitor;
• a first circuit block that receives a positive voltage and a grounding potential, as a power source;
• and
• a second circuit block that receives the positive voltage and the output voltage of the charge pump, as a power source,
• wherein the charge pump circuit includes:
• a first switching transistor that connects one end of the first capacitor with the input voltage;
• a second switching transistor that connects the one end of the first capacitor with the grounding potential;
• a third switching transistor that connects the other end of the first capacitor with the grounding potential;
• a fourth switching transistor that connects the other end of the first capacitor with the second capacitor;
• a fifth transistor having a drain and a gate connected to any one gate of the first to fourth switching transistors, and having a source connected to any one source of the first to fourth switching transistors;
• a current source that supplies a current to the drain of the fifth transistor;
• and
• a changeover circuit that changes over a period during which the current of the current source flows in the drain of the fifth transistor.