The present disclosure describes a synchronized switching power supply for a radio frequency (RF) power amplifier. In some aspects, a synchronized power supply circuit comprises a first switch connected between a power rail and a first terminal of an inductor that is connected to an output of the circuit via its second terminal. The circuit also includes a second switch connected between a ground rail and the first terminal of the inductor, and respective gate drivers for the first and second switches. An amplifier of the circuit is connected to the power rail and has an output connected to the output of the circuit. A current sensor is connected between the output of the amplifier and the output of the circuit, with an output of the current sensor being connected to an input of a comparator. A delay circuit is connected between an output of the comparator and the first and second gate drivers, and may synchronize the power supply circuit.