Memory system and power supply control circuit

A memory system comprising:

• a memory controller;
• a non-volatile memory;
• and
• a power supply control circuit configured to receive power from an external power supply,
• wherein the power supply control circuit includes:
• a backup power supply;
• a first converter configured to supply power to the memory controller based on power supplied from the external power supply or the backup power supply;
• a second converter configured to supply power to the non-volatile memory based on power supplied from the external power supply or the backup power supply, and
• a discharge circuit configured to discharge power remaining in the second converter based on power remaining in the backup power supply, after the supply of power from the external power supply and the backup power supply is stopped, wherein the discharge circuit includes:
• a first resistor having a first end connected to the backup power supply;
• a first transistor connected in series to the first resistor;
• a second resistor having a first end connected between the first converter and the non-volatile memory;
• and
• a second transistor connected in series to the second resistor, the second transistor having a control end connected between the first resistor and the first transistor.