High accuracy LDO regulator with fast transient response

Abstract

This paper presents a modified single miller capacitor feed forward compensation design for regulators resulting in a linear LDO (low dropout) regulator whose performance is independent of the off-chip capacitor and its ESR (equivalent series resistor). The proposed compensation method ensures the stability of the feedback loop and the sufficient phase margin of the LDO regulator. The proposed design is implemented using cadence 0.18μ technology. The circuit is operable down to input voltages of 2 V with a zero-load quiescent current flow of 60 uA. The novelty here is that the capacitor less concept is introduced with SMFFC topology and also an extra feed forward stage improved the stability to a greater extent.