The capacitor-less low dropout voltage regulator applied to mobile devices increases the power consumption due to the continuously exposed peak voltage. The dynamic feedback loop for the LDO regulator proposed in this study can provide a function to stably control the peak voltage regardless of the change in the load current. The performance of chip layout maintains an output voltage of 3V with a battery input voltage of 3.3-4.5V and a load current of 350mA. The peak voltage was maintained the undershoot voltage of 30mV and the overshoot of 33mV regardless of the change in the load current. In addition, circuit damage due to ESD (Electro Static Discharge) may occur frequently due to the increase of applications using low voltage along with miniaturization and integration of IC. This is an important factor affecting the overall reliability related to the productivity and stability. As a result, it was confirmed that the proposed LDO regulator secures high reliability at low voltage by applying the ESD protection circuit of the NLRSCR structure.