LM3519

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SNVS394A – AUGUST 2005 – REVISED SEPTEMBER 2005

INDUCTOR SELECTION

In order to maintain sufficient inductance, the saturation current rating of the inductor used with the LM3519

should be higher than the peak inductor current in the target application. Inductors with low DCR values have

less power loss and higher efficiency. Larger inductor values such as 2.2µH and 3.3µH can be used to optimize

efficiency, frequency and peak current. If 1µH is used, the peak inductor current, frequency will be higher and the

efficiency will be lower. Note that the switching frequency ranges will be higher at lower inductance. Typical

frequency range is between 4 to 8MHz for 1µH, 2 to 5MHz for 2.2µH and 2 to 4MHz for 3.3µH over the input

range. Below is a sample list of low profile inductors.

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