Memory system and power supply circuit

A power supply circuit configured to be used in a memory system, the memory system including a first terminal, a non-volatile memory, and a capacitor having a second terminal, the power supply circuit comprising:

• a third terminal;
• and
• a control circuit configured to:
• supply a first voltage to the third terminal on the basis of a voltage supplied to the first terminal;
• generate at least one second voltage using the first voltage;
• supply the at least one second voltage to the non-volatile memory;
• generate a third voltage using the first voltage;
• charge energy in the capacitor by supplying the third voltage to the second terminal;
• upon the voltage supplied to the first terminal being equal to or lower than a first threshold voltage and a voltage of the second terminal being higher than a second threshold voltage, supply a fourth voltage depending on energy of the capacitor to the third terminal while continuing charging of the capacitor;
• and
• upon the voltage of the second terminal being equal to or lower than the second threshold voltage, stop charging of the capacitor and supply a fifth voltage depending on the energy of the capacitor to the third terminal, wherein
• the third voltage is higher than the first voltage, and
• the second threshold voltage is higher than the first threshold voltage.