Customer circuit design uses a LM2674-3.3 simple switcher. Input range is 6.5-9.5V. Inductor = 68 uH. Output cap is 100 uF, but ceramic. There is a concern that this does not provide enough ESR and regulator may be unstable.
Circuit output also has a 100 uF tantalum cap after Cout, but separated by a ferrite bead. I am not sure whether the control loop sees the ESR of the tantalum cap and thus should be stable, or does the ferrite bead tend to isolate the second cap and stability concerns are realistic?
