Power supply control circuit and memory system

A memory system comprising:

• a nonvolatile memory;
• a controller electrically connected to the nonvolatile memory and configured to control the nonvolatile memory;
• a first converter configured to generate a first power supply voltage to be supplied to the nonvolatile memory;
• a second converter configured to generate a second power supply voltage to be supplied to the controller;
• and
• a power supply control circuit having an input terminal configured to receive an input power supply voltage supplied from an external power supply and an output terminal connected to each of the first converter and the second converter and configured to output an output voltage,
• the power supply control circuit including:
• an electronic fuse connected between the input terminal and the output terminal and including a first field effect transistor and a second field effect transistor, the first field effect transistor and the second field effect transistor being connected to each other such that an anode of a first body diode included in the first field effect transistor and an anode of a second body diode included in the second field effect transistor face each other, or a cathode of the first body diode and a cathode of the second body diode face each other;
• a first resistor connected between a gate of the first field effect transistor and a gate of the second field effect transistor;
• a reverse current detection circuit configured to detect a reverse current flowing from the output terminal to the input terminal due to a drop of the input power supply voltage to a voltage lower than the output voltage;
• and
• a gate control circuit connected to a gate of one field effect transistor among the first field effect transistor and the second field effect transistor and configured to supply a gate control signal for turning off the one field effect transistor to the gate of the one field effect transistor in response to the detection of the reverse current by the reverse current detection circuit, and
• the one field effect transistor being a field effect transistor including a body diode that is forward biased when the input power supply voltage is higher than the output voltage, among the first field effect transistor and the second field effect transistor.