Semiconductor integrated circuit for a regulator for forming a low current consumption type DC power supply device

A semiconductor integrated circuit for a regulator for forming a low current consumption type DC power supply device, the semiconductor integrated circuit comprising:

• an output transistor that is connected between an output terminal and a voltage input terminal to which a DC voltage is input;
• a control circuit that controls the output transistor according to a feedback voltage of an output;
• an operation control transistor that controls an operation state of the control circuit;
• an external terminal to connect an external capacitor;
• and
• an RC time constant circuit that includes an on-resistance of a transistor and the capacitor connected to the external terminal,
• wherein the semiconductor integrated circuit includes a soft start circuit that operates the operation control transistor and activates the control circuit at a timing that is delayed, by the RC time constant circuit, from a timing of applying a power supply voltage to the voltage input terminal.