3.3 µH shielded power inductor for DC-DC converters
The Coilcraft LPS5015-332MRC is a 3.3 µH shielded drum-core inductor in the LPS5015 series, rated for 1.3 A continuous with a saturation current of 1.9 A.
Rated current vs saturation margin for BOM fit
The 1.3 A current rating is the thermal limit based on the 125 mOhm DCR at 25°C ambient — above this the temperature rise accelerates. The 1.9 A saturation current gives 46 % headroom above the rated current, meaning the inductance holds its value under transient spikes up to nearly 2 A before rolling off. For a buck converter switching at 100 kHz, the inductor sees the DC load plus ripple current; the saturation margin covers ripple peaks without hard saturation. Self-resonant frequency is 88 MHz, well above typical switching frequencies for 3.3 µH inductors in 500 kHz to 2 MHz converters — the SRF will not limit the usable bandwidth. The ferrite core material keeps core losses low in this range.