Low dropout linear regulator and control circuit thereof

A control circuit of a low dropout linear regulator, which comprises a power transistor connected between a power supply terminal and an output terminal, wherein the control circuit is configured to drive the power transistor to convert a power supply voltage at the power supply terminal into an output voltage, wherein the control circuit comprises:

• an error amplifier, configured to drive the power transistor according to a voltage difference between a feedback voltage of the output voltage and a reference voltage;
• a foldback current-limiting protection circuit, connected with a control terminal of the power transistor for performing foldback control on an output current of the power transistor and short circuit protection;
• an undershoot suppression circuit, connected with the control terminal of the power transistor for pulling a voltage at the control terminal of the power transistor to low voltage level when the output voltage undershoots;
• and
• an output detection circuit, configured to judge whether the output voltage rises to a preset voltage value in a startup stage, and disable the undershoot suppression circuit and foldback control performed by the foldback current-limiting protection circuit before the output voltage rises to the preset voltage value.