Patent ID: 6225857
Filing Date: 2001-05-01
Classification: G05F

Abstract:
A non-inverting driver circuit for driving the pass device of a low dropout (LDO) voltage regulator, comprising:a pass device having a control input, said pass device connected to receive an input voltage and to produce an output voltage in accordance with a drive signal applied to said control input, said output voltage connected to a load referenced to an output common point,a level-shifting inverter stage arranged to receive an error voltage which is referenced to said output common point and which varies with the difference between said output voltage and a reference voltage and to produce a first output signal which varies inversely with said error voltage, anda normalizing inverter stage arranged to receive said first output signal at an input and to produce a second output signal which varies inversely with said first output signal, said second output signal being said drive signal applied to said control input, said normalizing inverter referred to said input voltage such that said drive signal remains substantially invariant with respect to said input voltage.