| 摘要 |
To provide a control circuit of a step-down DC-DC converter, a step-down DC-DC converter and a control method thereof which can prevent overshoot and production of a through current flowing to a main switching transistor and a synchronous rectifier transistor by adopting a simple circuit configuration. The control circuit of the step-down DC-DC converter in which a main switching transistor M 0 is constituted of a NMOS transistor has a MOS transistor M 2 connected between a gate of the main switching transistor M 0 and a ground potential and is operable to become conductive in response to an OFF command from the main switching transistor M 0.
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