Patent ID: 7548107

Claim:
A voltage output device for an electronic system, for transforming an input voltage for generating an output voltage for a load, the voltage output device comprising: a first node; a second node; a third node; a first transistor comprising a first terminal coupled to the input voltage, a second terminal, and a third terminal coupled to the first node; a second transistor comprising a first terminal coupled to the first node, a second terminal coupled to the second node, and a third terminal coupled to a ground terminal; a first driving unit comprising a power input terminal coupled to the third node, a ground terminal coupled to the first node, an input terminal, and an output terminal coupled to the second terminal of the first transistor; a second driving unit comprising a power input terminal coupled to a driving voltage, a ground terminal coupled to the ground terminal, an input terminal, and an output terminal coupled to the second node; a control unit coupled to the input terminal of the first driving unit and the input terminal of the second driving unit, for outputting a first control signal to the input terminal of the first driving unit and a second control signal to the input terminal of the second driving unit; a diode comprising an input terminal coupled to the ground terminal, and an output terminal coupled to the first node; an inductor comprising one terminal coupled to the first node and another terminal coupled to the load; a first capacitor comprising one terminal coupled to the load and another terminal coupled to the ground terminal; and a boost circuit comprising: a level shifter comprising an input terminal coupled to the second node, and an output terminal, for shifting levels of signals received by the input terminal and outputting the shifting result through the output terminal; a third transistor comprising a first terminal coupled to the driving voltage, a second end coupled to the output terminal of the level shifter, a third end coupled to the third node, and a fourth terminal coupled to the second node, for conducting a connection between the first terminal and the third terminal according to signals of the second terminal; and a second capacitor coupled to the first node and the third node.