A multi-phase control system for a power supply provides a data bus between a controller and multiple phase drivers to obtain a synchronous control through a flexible and non-dependent control configuration. The controller provides data signals to the data bus that is connected to the various phase drivers, with the data signals dependent upon a switching frequency and ON/OFF command signals for a particular phase. Each of the phase drivers have decoding logic for receiving the data signals over the data bus, as well as independent selection or addressing logic for choosing the phase driver to react to the data signals on the data bus. A variety of control configurations may be realized according to this control technique including resetting all drivers, setting all phases to ON or all phases to OFF conditions, skipping phase activation and so forth. The flexible control permits output current sharing to be controlled among the various phases to provide a desired output current for the power supply. The control configuration permits fast and robust response to transient conditions while providing a simplified control in an N phase system over a data bus that can vary between 1 and M lines.