Voltage generating circuit that produces internal supply voltage from external supply voltage

A voltage generating circuit comprising:

• a pump circuit including:
• first and second transistors connected between an input terminal and an output terminal;
• and
• a first capacitor which is connected at its one end to the connection node of the first and second transistors,
• the pump circuit being responsive to control signals applied to the gate electrodes of the first and second transistors and another end of the first capacitor to output from the output terminal a second voltage which is approximately equal to a first voltage applied to the input terminal;
• a back-gate voltage generating circuit which produces a third voltage which is less than the lower one of the first and second voltages, the third voltage being applied to at least the back gate of the second transistor;
• a second capacitor having its one end connected to the gate electrode of the first transistor and its other end connected to receive a corresponding one of the control signals;
• a first diode having its cathode connected to the connection node of the gate electrode of the first transistor and the second capacitor and its anode connected to receive the third voltage;
• a third capacitor having its one end connected to the gate electrode of the second transistor and its other end connected to receive a corresponding one of the control signals;
• and
• a second diode having its cathode connected to the connection node of the gate electrode of the second transistor and the third capacitor and its anode connected to receive the third voltage.