A sub-1v low-dropout regulator with an on-chip voltage reference

A sub-1V 50 mA low-dropout regulator (LDR) with an on-chip voltage reference is presented. This LDR utilizes the push-pull output stage to reduce the size of the power PMOS transistor. The proposed LDR with the on-chip voltage reference has been fabricated in 0.18 mum CMOS process, and its active area is 0.148 mm². Experimental results demonstrate that the voltage reference and the LDR work for the supply voltage of 0.6 V~1.2V. For the proposed LDR under a supply of 0.6 V, the measured settling time, voltage dip, and quiescent current are less than 2mus, 50 mV, and 16.6 muA, respectively.