What should be the minimum rated current of the inductor used in matching circuitry of NRF52832 IC?

[Sweety]

I have a problem in selecting inductor(L1). In NRF52832 IC datasheet, mentioned specifications of inductor L1 are: 3.9nH, 0402 high-frequency chip inductor. What should be the minimum rated current of the inductor? Reference circuit diagram:

[vishal]

For selecting L1 you use this mft part number LQP15MN3N9B02D it recommended in reference design. unfortunately i don't know minimum current rating for L1.

[Sweety]

Look into this inductor. Mft number: MLG1005S3N9BT000. Can I use this for my design?

[Jørn]

Hello Sabiha

The current through the inductor is very low, so you'll be hard-pressed finding an inductor that cannot handle it. The RF transmitter has a maximum current consumption of 16.6 mA at +4dBm without DCDC. (See page 229 of the product specification). And the current through the inductor will be lower than that. The inductor you listed, the MLG1005S3N9BT000 is rated for 700mA which is far beyond the current that will run through it. I believe it should work fine.

Best regards

Jørn Frøysa

[Gaurav]

Hi Sahiba,

The inductor used in this circuit should have current rating greater than 20mA (16.6mA Max radio current + 20% for safer Zone). You can use any inductor above this rating.

I used a inductor of 0.3A as (it was already available with me) for this circuit and it is working fine.