Patent ID: 7312599

Claim:
A buck converter, comprising: a first transistor, having a drain for receiving a first DC voltage, a gate for receiving a first control signal, and a source coupled to a node; a second transistor, having a drain coupled to the node, a gate for receiving a second control signal, and a source coupled to a constant voltage; a filter circuit, electrically coupled to the node for outputting a second DC voltage; a capacitor, and a switch, having a first terminal, a second terminal, and a control terminal, the first terminal electrically coupled to the gate of the second transistor via the capacitor, the second terminal electrically coupled to the source of the second transistor, the control terminal receiving the first control signal; wherein the first transistor has a first switching speed and the switch has a second switching speed; the second switching speed is faster than the first switching speed; wherein when the first control signal is enable, the first transistor and the switch are turned on, the capacitor is connected between the gate and the source of the second transistor, and the capacitance of the capacitor is chosen such that a shoot-through voltage at the gate of the second transistor generated by the first DC voltage is lower than a threshold voltage of the second transistor.