Linear voltage regulator

A method comprising:

• receiving a supply voltage at an input of a series voltage regulator;
• regulating a voltage drop across a semiconductor device to provide a regulated voltage output at a voltage output of the series voltage regulator;
• receiving an indication of a voltage variation in the regulated voltage output;
• and
• in response to the variation in the regulated voltage output, sinking a current from the voltage output through a parallel voltage regulator in an amount that offsets the voltage variation at the voltage output.

A circuit comprising:

• a series voltage regulator comprising a first semiconductor device coupled in series between a supply voltage and a voltage output, the series regulator operable to receive a voltage level from the supply voltage and to provide a regulated voltage level at the voltage output;
• and
• a parallel regulator comprising a second semiconductor device coupled to the voltage output and a third semiconductor device coupled to the voltage output,
• wherein the parallel regulator is operable to detect a decrease in voltage level provided at the voltage output, and in response to the decrease in the voltage level, to source a first amount of current to the voltage output through the second semiconductor device, the first amount of current adequate to offset the decrease in the voltage level at the voltage output, and
• wherein the parallel regulator is operable to detect an increase in voltage level provided at the voltage output, and in response to the increase in the voltage level, to sink a second amount of current from the voltage output through the third semiconductor device, the second amount of current adequate to offset the increase in the voltage level at the voltage output.