Low dropout voltage regulator circuit including gate offset servo circuit powered by charge pump

A method of providing a regulated output voltage, comprising:

• (a) providing
• i. an error amplifier having a first input coupled to a first reference voltage, a second input receiving a feedback signal, and an output producing a first control signal,
• ii. an output transistor having a gate, a drain coupled to an unregulated input voltage, and a source coupled to produce a regulated output voltage on an output conductor;
• iii. a feedback circuit coupled between the output conductor and a third reference voltage, the feedback circuit producing the feedback signal:, and
• (b) providing an offset voltage between the output of the error amplifier and the gate of the output transistor so as to separate the high current, high frequency path from the low current, low frequency path.

A method of providing a regulated output voltage, comprising:

• (a) providing
• i. an error amplifier having a first input coupled to a first reference voltage, a second input receiving a feedback signal, and an output producing a first control signal,
• ii. an output transistor having a gate, a drain coupled to an unregulated input voltage, and a source coupled to produce a regulated output voltage on an output conductor;
• iii. a feedback circuit coupled between the output conductor and a third reference voltage, the feedback circuit producing the feedback signal;
• and
• (b) providing an offset voltage between the output of the error amplifier and the gate of the output transistor so as to increase the amplitude of a voltage that can be applied to the gate of the output transistor without saturating the output of the error amplifier.