| 摘要 |
A first transistor and a second transistor are disposed in series between a first terminal and a ground terminal. A diode is disposed in parallel with the first transistor in a direction such that the cathode thereof will be on the first terminal side. An inductor is disposed between a connection point and a second terminal. A first capacitor is disposed between the first terminal and the ground terminal, and a second capacitor is disposed between the second terminal and the ground terminal. In a first mode, a control unit allows the first transistor and the second transistor to be alternately subjected to a switching operation, so as to lower the voltage of an external voltage Vext of the first terminal and to output the lowered voltage to the second terminal. In a second mode, the control unit turns the first transistor off, and allows the second transistor to be subjected to a switching operation, so as to raise the voltage of a voltage that is input to the second terminal and to output the raised voltage to the first terminal.
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