Abstract: A circuit and method for reducing voltage oscillations at the output leads of a digital integrated circuit. A circuit for reducing voltage oscillations on the output leads of a digital integrated circuit comprising a positive voltage charge pump unit coupled to an output driver, a negative voltage charge pump unit also coupled to the output driver and a sense and control unit coupled to both the negative voltage charge pump unit and the positive voltage charge pump unit is presented. The sense and control unit is configured to determine whether switching current is present in the source or drain of the output driver. If switching current is present in the source, then the sense and control unit is further configured to connect the positive voltage charge pump unit to the source. If switching current is present in the drain, then the sense and control unit is still further configured to connect the negative voltage charge pump unit to the drain.

Abstract: A multiphase power supply that minimizes losses during a low power mode+. In a particular embodiment, a multiphase power supply may include a plurality of switching regulators coupled in parallel with respect to one another. The multiphase power supply further comprises a phase control circuit coupled to each of the switching regulators. The phase control circuit is configured to generate a plurality of control signals for controlling the switching of the switching regulators so that they are out of phase with respect to one another. During the low power mode of operation of the microprocessor, the phase control circuit is configured to selectively suspend operation of a subset of switching regulators by removing or disabling at least one of the plurality of control signals to each of the subset of switching regulators.