Power supply circuit and semiconductor memory device including the same

A semiconductor memory device, comprising:

• a memory cell array including a plurality of memory cells;
• an input/output interface suitable for receiving data and a command from the external device;
• a page buffer suitable for receiving the data;
• a control logic suitable for receiving the command and generating a voltage supply control signal;
• and
• a power supply unit including a power supply device, and suitable for receiving the voltage supply control signal from the control logic, and supplying a memory driving voltage for driving the memory cell array,
• wherein a level of the memory driving voltage is determined based on a voltage level of the voltage supply control signal,
• wherein the power supply device includes a first transistor and a second transistor electrically coupled between a power supply terminal providing an input voltage and an output terminal outputting the memory driving voltage,
• wherein when a first current path, in which a current flows from the power supply terminal to the output terminal through the first transistor, is formed, a voltage level of the memory driving voltage is controlled to be greater than or equal to a predetermined level, and
• wherein when a second current path, in which a current flows from the power supply terminal to the output terminal through the second transistor, is formed, a voltage level of the memory driving voltage is controlled to be less than or equal to the predetermined level.