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CC2650: Internal DC-DC Inductor selection

Diego Lozano19
Prodigy 140 points
Part Number: CC2650

Hello,

As I can see the recommended part numbers of the inductor associated with the internal DC-DC regulator of CC2650 are:

  • MLZ1608N100LT000
  • CKS2125100M-T

However I am not able to find any documentation about the concrete specifications this part must have, more than being 10uH. The problem we face is that there seems to be some issues with the stock of these parts, so I would like to know how to select an alternative part.

Regards,

Diego.

  • 0
    TI__Guru 56590 points
    Hello Diego,
    Please refer to this thread:
    e2e.ti.com/.../1867260
  • 0 in reply to Eirik V
    Prodigy 140 points

    Hello Eirik,

    Thank you for pointing me to the other thread, however I can not find the kind of information I am seeking. As I can see there is a person asking for an alternative part to CKS2125100M-T, and the answer is to use the MLZ1608N100LT000. 

    I am aware of both of them, but I would like to know about the specifications I need to check to be able to select another part, since I am not able to obtain any of these two due to stock issues.

    Looking at the datasheets of both parts it seems that the specifications are similar:

    Specification CKS2125100M-T MLZ1608N100LT000
    Inductance 10uH +- 20% 10uH +- 20%
    Case size 0805 0805
    Rated current 0.11 A 0.3 A
    DC Resistance (max) 0.52 ohm 0.6 ohm +30%
    DC Resistance (typ) 0.4 ohm 0.6 ohm
    LQ Measuring Freq 2MHz 2MHz
    Self Resonating Freq (min) 24 MHz ---
    Temp Range -40 ºC to +85 ºC -55 ºC to 125 ºC

    I am not sure of the rated current of MLZ1608N100LT000, because I do not know for sure if it refers to the saturation current or the max current the device can whithstand without being damaged. The datasheet is:

    https://product.tdk.com/info/en/catalog/datasheets/inductor_commercial_decoupling_mlz1608_en.pdf

    I am guessing for now that the inductor should be 0805 with a rated DC resistance of about 0.5 - 0.6 ohm and a rated current higher than 0.11 A. Is that correct?

    Regards,

    Diego.

  • 0 in reply to Diego Lozano19
    TI__Guru 56590 points
    As long as the characteristics are similar you should be fine.
    MLZ1608N100LT000:
    Maximum DC Current: 0.3 A
    Current - Saturation 60mA