Supply voltage regulator

A circuit comprising:

• a control sub-circuit comprising:
• a first transistor having a first gate, a first drain, and a first source;
• a second transistor having a second gate, a second drain, and a second source, the second gate coupled to the first source;
• a third transistor having a third gate, a third drain, and a third source;
• and
• a fourth transistor having a fourth gate, a fourth drain, and a fourth source, the fourth gate coupled to the third drain, the fourth drain coupled to the second source, and the fourth source coupled to the third source;
• and
• a fast turn-on sub-circuit coupled to the third gate.

A circuit comprising:

• a control sub-circuit comprising:
• a first transistor having a first gate, a first drain, and a first source;
• a second transistor having a second gate, a second drain, and a second source, the second gate coupled to the first source;
• a third transistor having a third gate, a third drain, and a third source;
• and
• fourth transistor having a fourth gate, a fourth drain, and a fourth source, the fourth gate coupled to the third drain, the fourth drain coupled to the second source, and the fourth source coupled to the third source;
• a voltage protection sub-circuit coupled to the first gate;
• a fast turn-off sub-circuit coupled to the fourth drain;
• a fast turn-on sub-circuit coupled to the third gate and to the fourth gate;
• and
• a node initialization sub-circuit coupled to the first gate, to the second gate, to the third drain, to the fourth gate, and to the fast turn-on sub-circuit.