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TPS7A47: ultra low noise LDO improvment

xyz xyz
Intellectual 1000 points
Part Number: TPS7A47
Other Parts Discussed in Thread: TPS7B4253-Q1

Hello

I have chosen  all of LDOs in my system from TI such as TPS7A47 and ....

I found an article in Maximintegrated below:

https://www.maximintegrated.com/en/app-notes/index.mvp/id/3657

can I realize such concept with TPS7A series?

actually I didn't choose maxim or onsemi or... LDOs bcoz I believe TI's products are much more reliable. but it's an interesting idea

Best Regards

  • 0
    TI__Guru 55940 points
    Hi ,

    It looks like the application note referenced is describing how to build an LDO out of discrete components. It is important to note that the app note uses a reference rather than an LDO. This will allow for a tighter (more accurate) drift over temperature. While LDOs and references are similar devices, it is important to note that they generally serve different purposes. An LDO is used to deliver a clean power rail (voltage and current) while a voltage reference delivers an extremely accurate voltage with minimal temperature drift.

    I would expect that you may be able to build a similar circuit with TPS7A47; however, as you would not be using the TPS7A47 to deliver any current, your application may be better served with a voltage reference:

    www.ti.com/.../overview.html

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    TI__Guru 55940 points

    Hi ,

    I had another thought regarding the application note.  We have a family of voltage tracking LDOs  such as TPS7B4253-Q1 which provide a similar solution with fewer components.  You still would provide a reference; however, the voltage tracking LDO would provide various protection features as well as the amp and pass element.  

    Very Respectfully,

    Ryan