The MP2633 datasheet mentions that “for best results” use an inductor of either 1.8uH or 3.6uH (dependant on switching freq). And that the DC current rating should be 30% higher than max charge current.
But in the eval board, the inductor is set at 4.7uH and 6A rated current.
Obviously the selected inductor on the eval board is physically huge. Which value is correct?
Thanks.
Hi graeme
Thank you for contacting the MPS Forum. I’m looking at your question and will work on getting you an answer soon.
Thanks,
Brendan Schoemehl
Field Applications Engineer
Monolithic Power Systems | MPS Now
The inductor featured on the evaluation board can be considered overkill in order to absolutely guarantee ideal performance. If you need to use a smaller inductor based on your application, feel free to design for a different one. The 1.8uH or 3.6uH (or standard values close to this) will be acceptable, I would suggest going slightly above 30% to be even safer. However, if you want to save on design time and guarantee performance, the evaluation board inductor is safe as well.
MPS has an inductor selector tool as well, feel free to use this to choose an appropriate inductor.
Thanks,
Brendan