Patent ID: 7948078

Claim:
A power supply device comprising: a semiconductor device, the semiconductor device comprising: a base substrate of which at least the surface is formed of a conductive material; a semiconductor substrate which is mounted on one side of the base substrate, and on which a first pad, a second pad, and a linear regulator for stabilizing a voltage input to the first pad and outputting the voltage from the second pad are integrated; a first decoupling capacitor provided with an electrode pair of first and second electrodes formed in parallel, the first decoupling capacitor being mounted on the base substrate in a state where the first electrode is electrically connected to the one side of the base substrate; a second decoupling capacitor provided with an electrode pair of first and second electrodes formed in parallel, the second decoupling capacitor being mounted on the base substrate in a state where the first electrode is electrically connected to the one side of the base substrate; a first bonding wire which connects the first pad to the second electrode of the first decoupling capacitor; a second bonding wire which connects the second pad to the second electrode of the second decoupling capacitor; a first lead which is an external connection terminal; a second lead which is an external connection terminal; a third bonding wire which connects the first lead to the second electrode of the first decoupling capacitor; and a fourth bonding wire which connects the second lead to the second electrode of the second decoupling capacitor, the power supply device further comprising: a first smoothing capacitor provided outside the semiconductor device, connected to the first lead, and having a capacitance value of several ten to several hundred nF; and a second smoothing capacitor provided outside the semiconductor device, connected to the second lead, and having a capacitance value of several ten to several hundred μF.