TPS65133: TPS65133 Inductor Selection

Since I doubt may users will frequent this forum on Christmas, I will answer this.  The peak inductor current during normal operation is Ipk = (Iout / (1 - D)) + (ILp-p / 2).  TPS65133 specifies the current limit as valley current, so the peak current at current limit is Ipk = IOCL + ILp-p.  I typically design my circuits with inductors rated to handle the peak current at current limit.  This does result in a larger physical inductor, but a direct benefit is higher current rating = lower DCR = better efficiency.  If you want to use a smaller inductor, that is up to you.  It will be fine in normal operation, but may saturate or overheat under fault conditions. Calculate you maximum switch current in your application and choose an inductor that meets that rating.