Patent ID: 7432693

Claim:
A low drop-out DC voltage regulator for regulating a voltage from a DC power supply applied to a load at an output of the regulator and comprising: a pass device for controlling flow of current from said power supply to said load so as to control the output voltage at said regulator output; and a feedback loop for controlling said pass device, said feedback loop comprising: a resistive feedback path and a capacitive feedback path that includes a feedback capacitive element in series; and comparator means responsive to signals from said feedback paths for applying to said pass device an error signal that is a function of the value of said output voltage relative to a nominal value so as to control said output voltage, characterised in that said comparator means comprises feedback current producing means by maintaining a common point of said resistive feedback path and said capacitive feedback path at a reference voltage so as to produce a feedback current flowing in said resistive feedback path and in said capacitive feedback path in parallel between said regulator output and said common point, and current comparison means responsive to relative values of said feedback current and of a reference current for producing said error signal.