Low dropout voltage regulator

A low dropout voltage regulator comprising:

• an operational amplifier device configured to output at least a first control voltage according to an input voltage,
• a power supply device comprising:
• an input terminal configured to receive the first control voltage;
• a regulated voltage output terminal configured to output an output voltage;
• a first switch having a first terminal coupled to the input terminal, a second terminal, and a control terminal;
• a first transistor having a first terminal coupled to a first voltage terminal, a second terminal coupled to the regulated voltage output terminal, and a control terminal coupled to the second terminal of the first switch;
• and
• a current split circuit coupled to the first voltage terminal, the operational amplifier device, and the regulated voltage output terminal, and the current split circuit comprising a second transistor coupled between the first voltage terminal and the regulated voltage output terminal;
• and
• a feedback circuit coupled to the regulated voltage output terminal and the operational amplifier device.

A power supply device comprising:

• an input terminal configured to receive a first control voltage;
• a regulated voltage output terminal configured to output an output voltage;
• a first switch having a first terminal coupled to the input terminal, a second terminal, and a control terminal;
• a first transistor having a first terminal coupled to a first voltage terminal, a second terminal coupled to the regulated voltage output terminal, and a control terminal coupled to the second terminal of the first switch;
• and
• a current split circuit coupled to the first voltage terminal and the regulated voltage output terminal, and configured to receive the first control voltage or a second control voltage, the current split circuit comprising a second transistor coupled between the first voltage terminal and the regulated voltage output terminal.