A low drop-out voltage regulator (300) and method comprising: a
differential transistor arrangement (Q1 Q2) for receiving a reference
voltage and in dependence thereon producing a regulatred output voltage;
an output stage (Q3) for coupling to a load; and a control loop (310)
coupled to the differential transistor arrangement for providing a
dominant pole. Since a load capacitance is not used for dominant pole,
stability of operation may be obtained with a lower load capacitance. The
output stage is preferably a closed-loop unity gain amplifier providing a
low impedance output. This provides the following advantages: 1--The
output capacitor can be dramatically reduced or removed (a low dominant
pole, allows the regulator to worth with 0nF output capacitor).
2--internal power consumption can be reduced, improving regulator
efficiency. 3--Low output impedance is provided, with very low DC output
resistance. 4--The load capacitor can have zero ESR (equivalent serial
resistance).