Boost-type DC - DC converter

The present invention provides a boost-type DC species - DC converter comprising: a booster circuit, a protection circuit, a detection circuit, a feedback control circuit and a feedback circuit; the boost circuit to the outside via the output voltage of the protection circuit, the protection the circuit output current of the booster circuit, a control voltage to the external output circuit of the booster; a detection circuit for detecting the output voltage of the protection circuit, and the feedback control circuit is controlled in accordance with the output voltage detected the feedback voltage feedback circuit for feedback control of the booster circuit. The boost-type DC - DC converter is fully closed by increasing the output of the protection circuit and the detection circuit, output short circuit, short circuit protection and to achieve the effect of reducing the electric power consumption.