Renesas Electronics Corporation

Noboru Inomata

Hiroyuki Inoue

Yasuhiko Kokami

Hideyuki Tajima

Masayuki Ida

A disconnection detector circuit that can favorably inspect a connection state of a wire without increase in parasitic capacitance is provided. A semiconductor device includes, in one package, a first integrated circuit including a transformer including a primary coil and a secondary coil, and a second integrated circuit connected to a midpoint and one end of the secondary coil. The second integrated circuit includes a reference line and a detector circuit. The reference line connects the midpoint of the secondary coil and a reference potential. On basis of a potential at a predetermined reference point of the first power supply line, the detector circuit detects whether a connection state between the second integrated circuit and the secondary coil is normal or abnormal.

Semiconductor device

A DC-DC converter includes a high-side switch coupled between a first power supply and an output terminal, a low-side switch coupled between a second power supply and the output terminal, an inductor coupled to the output terminal, and a reverse current monitoring circuit that determines that a reverse current from the inductor to the output terminal occurs when the output terminal becomes a high voltage during a state in which the high-side switch and the low-side switch are in a dead time.

Growing community of inventors

Tokyo, Japan

Noboru Inomata