| 摘要 |
The present invention aims to provide a multi-power supply circuit capable of generating multi-power efficiently and reducing power consumption, and a multi-power supply method therefor. A supply voltage is output from a DCDC converter. Output transistors of linear regulators are series-connected to a power supply path between a resistive element and the DCDC converter. That is, a bias current path is shared between the linear regulators and the corresponding path is taken as one. With the supply voltage as the reference, supply voltages corresponding to intermediate negative voltages between the supply voltage and a reference voltage are generated by the linear regulators. A bias current consumed by the multi-power supply circuit is held constant as a bias current i regardless of the number of the linear regulators.
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