Renesas Electronics Corporation

Shinji Nishizono

Tadashi Shimizu

Norikazu Motohashi

Tomohiro Nishiyama

Hideki Sasaki

Tatsuaki Tsukuda

Hiroki Shibuya

Masahiro Dobashi

Hiroko Kubota

The reliability of an electronic device is improved. An electronic device has a wiring substrate and a housing made of a metal for supporting the wiring substrate. A semiconductor device having a switching power transistor is mounted at the wiring substrate. A ground pattern of a conductive film and a heat radiation pattern of a conductive film are formed at the wiring substrate. The heat radiation pattern is not electrically coupled with any electronic component mounted at the wiring substrate, and is also not electrically coupled with the ground pattern. The ground pattern overlaps the semiconductor device in the thickness direction of the wiring substrate. The heat radiation pattern overlaps the ground pattern in the thickness direction of the wiring substrate, and overlaps a region where the housing and the wiring substrate are in contact with each other.

Electronic device

A first semiconductor device having a power transistor for switching is mounted on a power wiring substrate PBa semiconductor device PKGhaving a driving circuit for driving the first semiconductor device and a semiconductor device PKGhaving a control circuit for controlling the semiconductor device PKGare mounted on a first principal surface of a control wiring substrate PBand a semiconductor device PKGhaving a regulator circuit is mounted on a second principal surface of the control wiring substrate PBOn the first principal surface of the control wiring substrate PBthe semiconductor device PKGand the semiconductor device PKGare mounted in a second area out of the second area and a third area adjacent to each other via a first area in which a plurality of holes HCare arranged. On the second principal surface of the control wiring substrate PBthe semiconductor device PKGis mounted in a fifth area out of a fourth area positioned opposite the second area and the fifth area positioned opposite the third area.

An electronic device has a control board having a plurality of wiring layers, a metal-made housing supporting the control board, and a fixing screw for fixing the control board to the housing through a washer. The control board includes a through hole penetrating from a third surface to a fourth surface, a through electrode formed inside the through hole, and a power system GND pattern formed on any wiring layer of the wiring layers. The power system GND pattern and the housing are electrically coupled through the through electrode, the washer, and the fixing screw.

Semiconductor device

An electronic device is downsized while suppressing performance degradation of the electronic device. In the electronic device, a power module including a power transistor is arranged in a first region on a back surface of a through hole board having a plurality of through hole vias having different sizes while a pre-driver including a control circuit is arranged in a second region on a front surface of the board. In this case, in a plan view, the first region and the second region have an overlapping region. The power module and the pre-driver are electrically connected to each other via a through hole via. The plurality of through hole vias include a through hole via having a first size, a through hole via which is larger than the first size and in which a cable can be inserted, and a through hole via in which a conductive member is embedded.

A plurality of semiconductor devices each including a semiconductor chip having a high-side MOSFET and a semiconductor chip having a low-side MOSFET are mounted on a wiring board (PB). The wiring board (PB) includes a power supply wiring WVto which a power supply potential is supplied and output wirings WD, WD, and WDelectrically connecting a low-side drain terminal of each of the plurality of semiconductor devices to a plurality of output terminals. A minimum value and a maximum value of a current path width in the power supply wiring WVare referred to as a first minimum width and a first maximum width, respectively, and a minimum value and a maximum value of a current path width in the output wirings WD, WD, and WDare referred to as a second minimum width and a second maximum width, respectively. When the first minimum width is smaller than the second minimum width, the first minimum width is larger than half of the second maximum width, and when the second minimum width is smaller than the first minimum width, the second minimum width is larger than half of the first maximum width.

In a communication control device in which an antenna electrode having an antenna connected thereto, a power supply circuit, and a communication circuit are mounted on a mounting board, the antenna electrode is disposed at one corner portion on a principal surface of the mounting board, the communication circuit is disposed on a side of a first side of the principal surface that shares the corner portion, and the power supply circuit is disposed on a side of a second side facing the first side. Further, a first signal path connecting the antenna electrode and the communication circuit extends along the first side, and a second signal path connecting the antenna electrode and the power supply circuit extends along a third side that shares the corner portion and is perpendicular to the first side.

Growing community of inventors

Tokyo, Japan

Shinji Nishizono