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TPS7A94: Clean +5/-5V sources from a SMPS

Dennis Brown
Prodigy 210 points
Part Number: TPS7A94
Other Parts Discussed in Thread: TPS7A33, TPS62913

I am looking to generate +/-5V at +1/-1A. 

The TPS7A94 seems pretty nice for a positive voltage regulator but is there an equivalent for -5V/-1A from TI?

Also, I am looking for a couple SMPS IC's that will generate voltages before an LDO cleanup stage.  Input voltage is +/-12V from a commercial switcher.  (So yes, switcher to switcher in series).  Any suggestions for two SMPS chips that will generate appx +/- 5.5V at 1A each that is available?  There are a lot of part shortages so I don't care if it is an older part.  What I do care about is that the chip works, a layout is provided that is idiot proof (not a SMPS person here) and will work for first board spin.   

  • 0
    TI__Mastermind 37965 points

    Hi Dennis,

    Yes, the new TPS7A94 is a very good choice for low-noise applications. We do not have a negative counterpart that gets very close to the performance of the TPS7A94. The best we have for negative LDO's is TPS7A33.

    For the SMPS inquiry I will reassign this post to the appropriate team to help with a suggestion. 

    Regards,

    Nick

  • 0
    TI__Expert 4600 points

    Dennis, 

    The TPS62913 is a low noise, low ripple DC/DC converter that allows removal of an LDO in many cases.  You can see the full details on the product page at www.ti.com\tps62913. I have also created an inverting buck-boost (IBB) EVM that enabled creating a negative output with the device.  Although it is still fairly low ripple, the nature of the inverting buck boost topology increases the ripple of the negative output voltage.  However, you can get an EVM from the product page to evaluate if it works in your application by going to the IBB EVM page here: https://www.ti.com/tool/TPS62913-IBB-EVM.  The EVM is designed for a -5V output and will meet the 5V input and 1A requirement.

  • 0 in reply to Steve Schnier
    Prodigy 210 points

    Hi Steve

    This is exactly what I wanted to see. Following the links to other files show more details.  Very nicely done.

    My last question is about availability of the TPS62913.  Given the current industry shortage going on do you have any sources for getting these parts?   How far out until availability? 

    dennis brown

  • 0 in reply to Dennis Brown
    TI__Genius 12981 points

    Hi Dennis!

    Steve will reply you tomorrow!

    Shuai

  • 0 in reply to Dennis Brown
    TI__Expert 4600 points

    Dennis, 

    Unfortunately I can't answer your questions about availability on the technical support forum. I suggest you work with your salesperson or ti support at https://ticsc.service-now.com/csm/ to answer those non-technical questions.