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  • Case ID: 339984
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Noise requirements on power supply to nRF54Lxx?

Jose Ojeda

Dear Sir.

I wonder on the noise demand on the power supply to nRF54Lxx? I have 24Vdc from a battery, and would like to use a standard DC/DC converter down to 3.3V (e.g LT1933ES6). Would that be too noisy supply for nRF54Lxx? Do you recommend LDO and filter after DC/DC converter, or only LDO, to reduce noise from standard ca 1 mV voltage ripple to lower voltage ripple? Are there any limits on voltage ripple for nRF54Lxx?

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    Hello Jose,
    We have added decoupling on the power supplies in our reference design to suppress normal/common noise frequencies. You should be able to use standard normal DCDC supply to deliver voltage in to the nRF54L15. That said, if you have a system you know produce some specific noise at a potentially difficult frequency, we would recommend adding additional decoupling capacitor on the supply in to the nRF54L15. Normally though this isn't a problem, but every customer have a slightly different noise source and some have more complicated setup than others. 
    Normal DCDC should be fine. If you see noise levels on the output from the DCDC that you think is stemming from the 24V source or system, then decouple it on the DCDC output. The levels that becomes difficult depends on the noise frequency as well. So yes, if you have noise that you can detect on the DCDC output, we would recommend to decouple it and smoothen out the voltage going into the nRF54L15.
    Best regards
    Asbjørn
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  • 0
    Hello Jose,
    We have added decoupling on the power supplies in our reference design to suppress normal/common noise frequencies. You should be able to use standard normal DCDC supply to deliver voltage in to the nRF54L15. That said, if you have a system you know produce some specific noise at a potentially difficult frequency, we would recommend adding additional decoupling capacitor on the supply in to the nRF54L15. Normally though this isn't a problem, but every customer have a slightly different noise source and some have more complicated setup than others. 
    Normal DCDC should be fine. If you see noise levels on the output from the DCDC that you think is stemming from the 24V source or system, then decouple it on the DCDC output. The levels that becomes difficult depends on the noise frequency as well. So yes, if you have noise that you can detect on the DCDC output, we would recommend to decouple it and smoothen out the voltage going into the nRF54L15.
    Best regards
    Asbjørn
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