A multiple-chip voltage feedback technique allows multiple strings of Light Emitting Diodes (LED's) and current sinks to be efficiently powered by a DC-to-DC voltage converter. A plurality of controllers connected in a daisy chain series monitor voltages between the connected LED's and the current sinks, progressively determine the lowest voltage, and then feed the lowest voltage back to the voltage converter. The DC-to-DC voltage converter monitors this lowest voltage and adjusts its output in order to ensure that the LED strings have adequate voltage with which to function, even as the LED's have different forward voltages and the strings are asynchronously enabled and disabled.