High-precision self-compensated fully-integrated CMOS LDO regulator

A high-precision fully-integrated internally compensated Low-Dropout (LDO) regulator is presented in this paper. Stability is achieved by taking advantage of the Miller compensation network of the two-stage error amplifier, thus avoiding the use of additional compensation elements. A simple control circuit enhances the transient response. Experimental results show that the proposed LDO, designed in UMC 0.18μm CMOS technology, regulates the output voltage Vout at 1.8V for input voltages ranging from 3.3V to 1.91V, with up to 50mA load current. The dropout voltage Vdo is 110mV and a load regulation of only 0.04mV/mA is achieved.

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