Voltage regulator

A voltage regulator comprising a power supply terminal and an output terminal, the voltage regulator being configured to provide a power supply voltage at the power supply terminal, and the output terminal being configured to connect to a load and to provide an output voltage, wherein the voltage regulator comprises:

• an NMOS transistor comprising a drain electrode connected to the power supply terminal of the voltage regulator, a gate electrode, and a source electrode connected to the output terminal of the voltage regulator;
• a first regulating circuit comprising:
• a voltage divider circuit connected between the output terminal of the voltage regulator and ground, the voltage divider circuit being configured to generate a feedback voltage based on the output voltage of the output terminal of the voltage regulator;
• an error amplifier comprising a first input terminal configured to provide a reference voltage, a second input terminal connected to the voltage divider circuit, and an output terminal connected to the gate electrode of the NMOS transistor;
• and
• a second regulating circuit comprising:
• a charge pump comprising an enable control terminal configured to receive an enable control signal and an output terminal connected to the gate electrode, the charge pump being configured to be selectively turned on based on the enable control signal to regulate the output voltage of the voltage regulator.