Patent ID: 8994120
Filing Date: 2015-03-31
Classification: H01L,H02P,H05K

Abstract:
1. A motor control multilayer circuit board comprising: a multilayer printed wiring board having a plurality of laminated conductor layers; a first field-effect transistor connected to the conductor layers and configured to control a motor; a second field-effect transistor connected to the conductor layers and arranged at a location at which the second field-effect transistor overlaps with the first field-effect transistor in a laminated direction in which the conductor layers are laminated, the second field-effect transistor being configured to control the motor; and a heat dissipation mechanism arranged on the multilayer printed wiring board and arranged at a location at which the heat dissipation mechanism overlaps with at least one of the first field-effect transistor and the second field-effect transistor in the laminated direction wherein the first field-effect transistor and the second field-effect transistor are serially connected to each other by a serial line, the first field-effect transistor is configured to function as a switching element that is arranged on a higher potential side than the second field-effect transistor, the second field-effect transistor is configured to function as a switching element that is arranged on a lower potential side than the first field-effect transistor, the first field-effect transistor and the second field-effect transistor each are a power MOSFET having a gate terminal and a source terminal at one surface and having a drain terminal at the other surface, and the source terminal of the first field-effect transistor is arranged at a position at which the source terminal of the first field-effect transistor overlaps with the drain terminal of the second field-effect transistor in the laminated direction.