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PCM5122: PCM5122 3.3V LDO regulator for 5V SMPS

Carlos Lim
Prodigy 20 points
Part Number: PCM5122
Other Parts Discussed in Thread: LM4917

The datasheet reads "Many systems use a low-noise regulator to provide an AVDD3.3-V supply for the DAC." -- is there a recommended device for this? I am using a 5V 1.5A SMPS which also powers a raspberry pi.  The voltage output of the PCM5122 will be going into an LM4917 for which I also must supply a regulated 1.4-3.6V.

Many PCBs I see using this device also seem to have more than a couple surface mounted regulators but I can't seem to identify them by their markings. 

What would be a good starting point for a TI regulator choice as I am going by the datasheet "9.2 Typical Application" -- am I at least correct in assuming I could utilize two separate 3.3V regulators for both the LM4917 and the PCM5122?

Many suggestions I find on the web are from 2011 or so and I'd like to know what you might recommend for an smd "low noise, low dropout 3.3v regulator" today.

  • +1
    TI__Mastermind 41903 points

    Hi Carlos,

    The PCM5122 EVM uses the TPS73633 which would be a good option. I'm linking a ti.com search that has 20 more similar options for you. The TPS73633 is a fixed 3.3V output LDO with a 400mA output current capability which should be fine to supply the PCM5122 and LM4917. Separate LDOs would be ok too. You can further refine the search for features such as the noise, max Iout, package type, adjustable vs fixed output, price etc. Here is the link. 

    Let us know if you need any additional assistance. You can also take a look at the PCM5122 EVM User's Guide if you need additional guidance with the schematic or layout. 

    Best,

    Katlynne Jones