| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a DC-DC converter integrated circuit which maintains high efficiency in a lightly loaded state and facilitates control over output voltage in a wide current range, and to provide a DC-DC converter using the integrated circuit. Ž<P>SOLUTION: The DC-DC converter integrated circuit includes a switching terminal, a feedback terminal, a high-side transistor, a voltage detector operable to compare a voltage of the switching terminal with a first reference voltage, an error amplifier operable to generate an error signal from a voltage of the feedback terminal and a second reference voltage, and a control circuit. When the voltage detector detects the voltage of the switching terminal to be higher than the second reference voltage, the control circuit turns off the high-side transistor in a period next to a period in which the voltage of the feedback terminal is detected to be higher than the second reference voltage by the error signal, but it turns on the high-side transistor in a period next to a period in which the voltage of the feedback terminal is detected to be lower than the second reference voltage by the error signal. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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