A voltage converter includes a converting circuit and a switching control circuit, where the converting circuit includes an inductor connected to a switching node, a first switching device connected between the switching node and a common voltage and a second switching device connected to the switching node, where the first switching device charges the inductor and discharges the inductor in response to a control signal, and the switching control circuit generates the control signal by performing a PWM and a PFM based on a first sensing signal, a second sensing signal and a feedback signal, and adjusts a charging time of the inductor on a time basis, based on at least the input power supply voltage when the switching control circuit performs the PFM.