Patent ID: 8411077

Claim:
A DC-DC converter comprising: a buck-boost circuit for generating and outputting a second power of a second power source using an input voltage, the buck-boost circuit being configured to adjust and output the voltage level of the second power of the second power source in accordance with the voltage level of the input voltage; a boost circuit for generating and outputting a first power by boosting the input voltage; and a controller configured to control the boost circuit and the buck-boost circuit, wherein the buck-boost circuit comprises a first coil coupled between a first node and a ground; a first capacitor having first and second electrodes, the first electrode being coupled to the first node; a first switch coupled between the first node and an input terminal; a second switch coupled between the second electrode of the first capacitor and the ground; and a third switch coupled between the second electrode of the first capacitor and a first output terminal.