Circuitry, which includes a parallel amplifier and a switching supply, is disclosed. The parallel amplifier regulates a power supply output voltage based on a power supply control signal and provides a current sense signal, which is representative of a parallel amplifier output current from the parallel amplifier. The switching supply is coupled to the parallel amplifier. The switching supply provides a switching output voltage and makes an early determination of the switching output voltage using the current sense signal and the power supply control signal to at least partially compensate for delay in the switching supply. Additionally, the switching supply drives the parallel amplifier output current toward zero using the switching output voltage to increase efficiency.