A DC/DC converter. In the DC/DC converter, a DC/DC conversion circuit provides an output voltage to a storage capacitor upon receiving an enable signal. First and second resistors are connected in series to produce a first voltage according to the output voltage. A Schmitt trigger is coupled to the first voltage to output a first control signal through an inverter when the first voltage is smaller than a second voltage and to output a second control signal through the inverter when the first voltage is higher than a third voltage. An oscillator is turned off upon receiving the first control signal such that the DC/DC conversion circuit stops providing the output voltage, and is turned on and outputs the enable signal upon receiving the second control signal such that the DC/DC conversion circuit provides the output voltage to the storage capacitor.