The DCR current sensing with temperature compensation was developed for a particular reason: it was observed that customers were often overdesigning the inductor. At room temperature everything operates as expected, and there is no additional efficiency loss caused by the DCR sensing or current limit. However, over the entire operating temperature range, DCR varies greatly and therefore cause the current limit to also vary greatly. This particular example shown here showcases a current limit variation around 70%, as shown by the blue line. The red line represents the LM27403, which has the temperature-compensated DCR sensing technique. The current limit that was set at room temperature is maintained over the operating temperature range. The variation using the LM27403 in this example is less than 10%. This allows the designer of the DC-DC converter to choose a smaller, less expensive inductor.