VOLTAGE REGULATOR HAVING ERROR AMPLIFIER OF RAIL-TO RAIL

摘要

A voltage regulator according to an embodiment of the present invention includes a reference voltage generator which generates a reference voltage; an error amplifier which compares and amplifies a difference between the reference voltage and an input voltage; a pass transistor which changes the level of a drive current according to an output voltage which is generated from the error amplifier; and a voltage distributor which distributes the output voltage of the pass transistor and provides the output voltage as an input voltage of the error amplifier. The error amplifier comprises an input end of a rail-to-rail structure which respectively receives the reference voltage and the input voltage by using a pair of NMOS and PMOS transistors; and an output end of a voltage buffer structure for driving a load.