DC-DC converter

The utility model discloses a DC-DC converter comprising an oscillator, an error amplifier, an auxiliary soft start circuit, a drive circuit and a reference circuit, the reference circuit outputs a first reference voltage to the error amplifier and outputs a second reference voltage to the oscillator; the oscillator receives the feedback voltage and the second reference voltage after voltage division of the output voltage and generates a square wave and a triangular wave, the square wave is output to the error amplifier, and the triangular wave is output to the comparator; the error amplifierreceives the square wave, the feedback voltage and the first reference voltage, and the voltage output by the error amplifier is input into the comparator under the control of the auxiliary soft startcircuit; and the comparator transmits the compared level to the driving circuit, and drives the input voltage to output the output voltage through the BUCK circuit. According to the utility model, the oscillator, the error am