DC-DC converter, driver IC, and system in package

摘要

A DC-DC converter in which self turn-on can be prevented and can improve power efficiency. In a non-insulated DC-DC converter, self turn-on is prevented by applying a negative voltage between a gate and a source of a low side MOSFET by the use of a capacitor for generating negative voltage when the low side MOSFET is in an OFF state. Also, when the low side MOSFET is in an ON state due to the capacitor for generating negative voltage, a positive voltage applied between the gate and the source of the low side MOSFET does not drop from a voltage of a gate driving DC power source that is supplied from a gate power input terminal. Therefore, the power efficiency is improved.