SLOS751D March 2013 – November 2018 DRV2667
The current limit of the boost switch can be adjusted through a resistor to ground placed on the REXT pin. To avoid damage to both the inductor and the DRV2667 device, the programmed current limit must be less than the rated saturation limit of the inductor selected by the user. If the combination of the programmed limit and inductor saturation is not high enough, then the output current of the boost converter will not be high enough to regulate the boost output voltage under heavy load conditions. This then causes the boosted rail to sag, possibly causing distortion of the output waveform.