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TPS62110 with tantalum output capacitor

VBKen
Intellectual 255 points
Other Parts Discussed in Thread: TPS62110, TPS62140, TPS62160

The datasheet for the TPS62110 specifies that the output capacitor should be a ceramic type with low ESR.  I can only find tantalum capacitors (22uF and 33uF) with a 175C rating and I was wondering what is the ballpark value for the ESR on the output capacitor.  The ESR for the tantalum capacitors is about 3 ohms and if I use two in parallel that would reduce the ESR to about 1.5 ohms.  What problems would I run into if I used the tantalum caps?  Thanks

  • 0
    TI__Guru**** 150950 points

    This IC has not been tested with only tantalum caps.  I would recommend using a small ceramic in parallel with the tantalum.  Surely, there's some high temp ceramics out there.

    In addition, I would also make sure you look at the new TPS62140 and TPS62160 families, offering higher efficiency and smaller solution size.

  • 0 in reply to Chris Glaser
    Intellectual 255 points

    I should clarify what I meant by high temperature.  The power supply is meant to operate from 150C to 175C.  Neither of the TPS62140 or TPS62160 are available in high temperature (150C-175C) so neither would work in my application.  As far as high temperature ceramics are concerned, a preliminary search revealed that 1000 pF 175C caps are readily available but I would require about 30,000 on the board to make it work. 10uF, 200C ceramic caps are available but but 3 (33uF total ) would cost about $270.  A fairly good tantalum rated at 175C cost about $9 so you can see why I it would be very beneficial if the TPS62110 could use tantalum caps on the input and output.  Please let me know if anyone knows of any 22uF, 175C capacitors that are reasonably priced and readily available. priced.

    Thanks.

  • 0 in reply to VBKen
    TI__Guru**** 150950 points

    We do have a high reliability forum, where they might be able to help you: http://e2e.ti.com/support/applications/high_reliability/f/30.aspx

  • 0 in reply to Chris Glaser
    Intellectual 255 points

    Chris,

    With the abundance of high temp tantalum capacitors, I will try your recommendation to use a tantalum in parallel with a ceramic.  I did find some tantalum's with ESR around 500 mohm.  Thanks,