DC CONVERTER CIRCUIT AND POWER SUPPLY CIRCUIT

摘要

A DC converter circuit having high reliability is provided. The DC converter circuit includes: an inductor configured to generate electromotive force in accordance with a change in flowing current; a transistor including a gate, a source, and a drain, which is configured to control generation of the electromotive force in the inductor by being on or off; a rectifier in a conducting state when the transistor is off; and a control circuit configured to control on and off of the transistor. The transistor includes an oxide semiconductor layer whose hydrogen concentration is less than or equal to 5×1019 atoms/cm3 as a channel formation layer.

主权项

1. A DC converter circuit comprising:
an inductor comprising a terminal; a transistor connected to the terminal of the inductor; a rectifier connected to the terminal of the inductor; and a control circuit connected to the transistor, wherein a channel formation region of the transistor comprises an oxide semiconductor with a hydrogen concentration of less than or equal to 5×1019 atoms/cm3.