A comparative example is considered here in which the first output terminal T12 and the second output terminal T22 are electrically disconnected from each other. In this case, the consumption current Id of the motor 41 should be supplied from the second constant voltage circuit 12 alone. In this case, therefore, the second constant voltage circuit 12 needs to be configured such that it can supply the consumption current Id required for the activation. Thus, a value of a maximum output current Im of the second constant voltage circuit 12 needs to be large, where the maximum output current value Im is defined as a maximum value of the second current I2 which can be supplied from the second constant voltage circuit 12. As a result, components (for example, the power supply IC incorporating the LDO regulator and the like) of the second constant voltage circuit 12 need to have comparatively large sizes.

In view of the above, in the power supply 1 of the embodiment, the first output terminal T12 of the first constant voltage circuit 11 and the second output terminal T22 of the second constant voltage circuit 12 are electrically connected to each other. With this configuration, both of the first constant voltage circuit 11 and the second constant voltage circuit 12 can supply currents to the motor 41 for securing the consumption current Id. Accordingly, the maximum output current value Im of the second constant voltage circuit 12 can be made small compared to the comparative example.