Semiconductor device and manufacturing method thereof

An electronic device including a switching regulator circuit having a first operating mode and a second operating mode, the switching regulator circuit comprising:

• a switching signal generating circuit which outputs an internal switching signal for switching an operating mode between the first operating mode and the second operating mode when an operating state satisfies a predetermined condition;
• a mode selection pad to which an external switching signal is input;
• a trimming fuse which inputs an output from the switching signal generating circuit to the mode selection pad;
• and
• a switching circuit which switches the operating mode between the first operating mode and the second operating mode after cutting off the trimming fuse,
• wherein when the external switching signal is a high level, the switching circuit selects the first operating mode, and
• when the external switching signal is a low level or not input, the switching circuit selects an automatic switching mode in which the operating mode is automatically switched between the first operating mode and the second operating mode, corresponding to the internal switching signal, and
• wherein the mode selection pad is configured for monitoring the switching signal before cutting off the trimming fuse, and is configured for selecting the operation mode after cutting off the trimming fuse.