a power supply for plural loads coupled in parallel comprises a voltage regulator , a plurality of current regulators , and an error control circuit . the voltage regulator provides a common output voltage to the plural loads . the voltage regulator comprises a sensor circuit providing a voltage sense signal corresponding to the output voltage , which provides feedback to regulate the output voltage at a selected level . the plurality of current regulators are coupled to respective ones of the plural loads . each of the plurality of current regulators regulates current drawn by respective ones of the plural loads to within a desired regulation range . the plurality of current regulators each further provide a respective error signal corresponding to an ability to remain within the desired regulation range . the error control circuit is operatively coupled to the voltage regulator and to the plurality of current regulators . the error control circuit receives the error signals from the plurality of current regulators and provides a common error signal to the voltage regulator . the voltage regulator thereby changes the selected level of the output voltage in response to the common error signal . accordingly , the selected level of the output voltage remains at a minimum voltage necessary to keep the plural loads in the desired regulation range .