Latch circuit and power supply control device

A power supply control device for controlling power supply through a power supply switch, comprising:

• a voltage adjusting unit that is configured to outputs a voltage, and adjust the voltage to be output (output voltage);
• a latch circuit configured to output a voltage that depends on an output voltage of the voltage adjusting unit until a predetermined condition is satisfied, and fix its output voltage to a predetermined voltage when a predetermined condition is satisfied;
• and
• a switching circuit configured to switch the power supply switch on or off depending on the output voltage of the latch circuit,
• wherein the latch circuit includes:
• a first switch that has an input end to which a current is input, an output end from which a current is output, and a control end, and is switched from off to on when the voltage between the input end and the control end increases to a threshold voltage or more;
• a first resistor that is connected between the input end and the control end;
• a second resistor whose one end is connected to the control end;
• a second switch that has a second input end to which a resistor current that flows through the first resistor and second resistor in that order is input, and is switched on when the first switch is switched on;
• and
• a third switch to which the resistor current is input, and
• when the second switch or third switch is on, the voltage across the first resistor increases,
• the output voltage of the voltage adjusting unit is input to the input end of the first switch, and
• a voltage is output to the switching circuit from the second input end of the second switch.