A multi channel LED driver comprises a plurality of LED strings. Each of the plurality of LED strings are associated with a separate channel. A voltage regulator generates an output voltage to the plurality of LED strings responsive to an input voltage and a PWM control signal. First control logic generates the PWM control signal responsive to a voltage at a bottom of each of the plurality of LED strings. A plurality of dimming circuitries, each connected to one of the bottoms of the plurality of LED strings, control a light intensity in each of the plurality of LED strings responsive to dimming control signals. Second control logic generates the dimming control signals responsive to forward currents monitored through each of the plurality of LED strings and dimming data.