Slew Rate and Transient Response Enhancement in MOLDO with Modifying Error Amplifier Structure

摘要

In this paper, we use bias current boosting and slew rate enhancement in multiple-output Low-dropout structure to achieve a faster transient response. This method reduces ripples of output voltage during sudden changes in load current and input voltage. The proposed MOLDO circuit was simulated with a 0.18 mu m CMOS process in buck mode with four-output legs. Integrating of proposed circuit is easier because there is the symmetry in the circuit designing. The results of our work show that when input voltage changes between 2.5-3.3 V, the output voltage after 25 mu s with load current of 100 mA, is determined with ripple less than 1.8 mV. In sudden changes, the load current at the range 0-100 mA, and output voltages after a maximum 15.5 mu s with an input voltage of 3.3V have the highest ripple in output voltage of 4 mV.