The invention relates to a method and an apparatus for controlling average current by pulse modulating an output current. The apparatus includes a constant-on-time switching regulator. During the pulse modulation on-time, an output voltage is regulated at a level corresponding to a defined value of a corresponding output current. A control signal is provided to indicate an adjustment to the output voltage that enables regulation of the output current to the defined value. During the pulse modulation off-time, the output voltage is maintained at the level that substantially corresponds to the defined value of the output current during the pulse-modulation on-time.