The property of limiting peak inductor current up to 1.5 A is intrinsic to device. However, if the required output power is increased in such a manner that the peak inductor current needs to be increased above 1.5A then the current loop comes in to play and we can set the peak inductor current as a function of output power according to the expression IL(PEAK) = 1.0 · POUT . For example for a 4.5W output power we have to select an inductor of at least 4.5A. Usually it’s better to give a 20% allowance above the peak inductor current to avoid inductor saturation under extreme conditions. So in that case selected inductor must have a saturation current rating of 4.5 +0.2*(4.5) = 5.4A.