nRF5340 CLAA 10uH inductor DCR requirement

[Poki Huang]

Hi

Could you provide what is the max DCR value of L2/L3 10uH inductor in document "PCA20053_Schematic_And_PCB.pdf" that nRF5340 can be accepted?

nRF5340 datasheet only show Isat>90mA requirement

Could you help check if TAIYO/LSQPB160807T100M can be used for nRF5340 L2/L3 10uH inductor?

Thank you

Poki

PCA20053_Schematic_And_PCB

[Simonr]

Hi

In the nRF5340 product specification, the description of the DCDC inductors (L3 and L4) are described as following: 

Do you need any further information than this?

Best regards,

Simon

[Poki Huang]

Hi Simon:

So for nRF5340 DCDC 10uH inductors (L3 and L4)

1. Only ask 50mA, +-20% tolerance. No concern DCR right?

2. TAIYO/LSQPB160807T100M (10uH, 170mA, +-20%, DCR 2.6ohm) can be used right?

Thank you

Poki 

[Simonr]

Hi Poki

I just checked with the developers, and the DCR should be as low as possible, maximum 80mA and as low resistance as possible. 2.6 Ohm is too high.

<=0.65 Ohm is okay, but preferably as low as possible.

Best regards,

Simon

[Poki Huang]

Hi Simon:

But in nordic document "PCA20053_Schematic_And_PCB"

Your 10uH inductor (L2/L3) is Murata/LQM18DN100M70L,100mA, ±20%, 1.05Ohm

It's DCR is higher than 0.65ohm, could you help check again?

Thank you

Poki