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TPS43351-Q1: alternative solution

Chuqiang Wen
Expert 4930 points
Part Number: TPS43351-Q1
Other Parts Discussed in Thread: TPS43350-Q1, TPS43335-Q1, TPS43332-Q1

Hi Expert,

My customer is facing shortage for TPS43351-Q1 and looking for the alternative solution. 

My question is that,

  • What the difference between TPS43351-Q1 and TPS43350-Q1? 
  • Except TPS43350-Q1, is there any other P2P compatible option that customer do not need to change the layout? 

Thanks!
Ethan Wen

  • 0
    TI__Mastermind 37660 points

    Hi Ethan,

      The only difference between TPS43351-Q1 and TPS43350-Q1 is: TPS43351-Q1 have the feature of "Frequency-Hopping Spread Spectrum" active.  Please refer to its datasheet linked here for more details.

      We don't have other P2P replacement part. 

    Thanks!

    Phil

  • 0 in reply to Phil Yi40
    TI__Expert 4930 points

    Hi Phil,

    Thanks for your information. 

    As checked on ti.com, I found TPS43335-Q1 is pin compatible with TPS43351-Q1.  I have a roughly comparison between them. The only difference is the boost controller on TPS43335-Q1. And it seems TPS43335-Q1 can drop in placement with TPS43351-Q1 without any layout change. 

    May you kindly help confirm that? 

    Ethan Wen

  • 0 in reply to Chuqiang Wen
    TI__Mastermind 37660 points

    Hi Ethan,

      No; the TPS43335-Q1 isn't a drop in placement with TPS43351-Q1. See the two reasons below:

    Thanks!

    Phil

  • 0 in reply to Phil Yi40
    TI__Expert 4930 points

    Hi Phi,

    Maybe some confusion here. Customer is facing shortage on TPS43351-Q1, and we found the TPS43335 is an option. 

    Regarding to the reasons you point out, the pin 19 ENC on TPS43335 is refer to the AGND on TPS43351-Q1. So I think it is reasonable to connect the ENC to AGND which means disable the boost regulator. 

    The pin 36 DIV on TPS43335 is refer to the NC pin on TPS43351. Since we disable the boost controller through ENC, I think leave open for DIV pin is also reasonable. 

    Please correct me if any misunderstanding. 

    Thanks!

     Ethan Wen

  • 0 in reply to Chuqiang Wen
    TI__Prodigy 320 points

    Ethan,

    looks like we are working on the same problem for our customer :-)

    Besides the pins needed to control the boost features being connected properly there seems to be a electrical difference too.

    The gate drive currents and RDSon of the internal gate drivers are different.

    For TPS43351-Q1 the current is specified with 1.5A and the RDSon with 2Ohm max.

    For TPS43335-Q1 the currents is specified with 0.7A and the RDSon with 4Ohm max.

    Any thoughts??

    Best regards

    Carsten

  • 0 in reply to Carsten Koeck
    TI__Mastermind 37660 points

    Hi Carsten, Ethan,

       If Booster is not needed and disable it by connecting its ENC to GND; it looks like the TPS43332-Q1 is a good p2p replacement for TPS43351-Q1. Can you check if Kostal likes to order some samples to prove it before production order?  

    Thanks!

    Phil