The power management circuit 100 includes a DC/DC converter controller with four channels CH0 through CH3. Two channels CH1 and CH2 from among the four channels CH0 through CH3 are configured using the architecture described above. The remaining two channels CH0 and CH3 operate independently.

The SOC 311 includes a core 320, memory 322, and other blocks. The power management circuit 100 mainly supplies a power supply voltage to the core 320. The other power supply circuits 330 supply a power supply voltage to the memory 322 and the other blocks.

The SOC 311 employed in the platform shown in FIG. 10A is provided with four independent power supply pins VDD0 through VDD3. In this case, the power management circuit 100 is set to the first mode. In this mode, the two channels CH1 and CH2 operate independently. Accordingly, the power management circuit 100 operates as a four-channel DC/DC converter.

The SOC 312 employed in the platform shown in FIG. 10B is provided with three independent power supply pins. One from among the three power supply pins, i.e., VDD1, supports an amount of current that is larger than those of the other channels. In this case, the power management circuit 100 is set to the second mode. In this mode, the two channels CH1 and CH2 operate as a single channel Overall, the power management circuit 100 operates as a three-channel DC/DC converter.