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TPS61170-Q1: Facing some strange issues with TPS61170-Q1

Part Number: TPS61170-Q1

Hi TI support,

We are facing strange issues with TPS61170-Q1 in 5->12V/120mA boost circuit. Not sure it is related to some manufacturing lot or design. Pls find attached design 5->12V/120mA with TPS61170-Q1 which works fine on Webench. This IC we had been using in some other product also for 12->24V conversion. In newly assembled PCB with 5->12V design, I changed 4 ICs from online received lot but couldn’t see any waveform at SW node prompting that IC is not working. Finally getting working IC from other product (from 12->24V design) made 5-12V circuit working.

 

Attached are layout & schematic of 5->12V circuit along with 5V waveform during power ON.

a. Do you think there are some sensitive timing issues w.r.t CNTRL pin & VIN where there is possibility of IC not getting enabled?

b. Is TPS61170-Q1 so sensitive of getting damaged during normal handling, etc. It seem we have received damaged ICs from online resource.

c. Finally, is the attached design OK?

Thanks,

jagdish

  • Hi, please check my answer below:

    a. Do you think there are some sensitive timing issues w.r.t CNTRL pin & VIN where there is possibility of IC not getting enabled? -->  there's no timing issue for the CTRL. it can be directly connec with Vin pin.

    b. Is TPS61170-Q1 so sensitive of getting damaged during normal handling, etc. It seem we have received damaged ICs from online resource. --> It is not so sensitive to be damaged.   But of course should be carefully handling it to avoid the ESD issue.  which online resource you used?  could you please take a photo of the 'IC's top side'  to us, we need to check the marks on it.

    c. Finally, is the attached design OK? it is OK.

    Best Regards,
    Helen

    Boost DC/DC Solution

  • In reply to Helen chen:

    Hi Helen,

    We got the lot from Arrow electronics. It seems last 2 lots of 17 pcs received from Arrow are not working.

    BTW, we also tried to get those ICs soldered from third party CM (From Arrow lot) to rule out our internal handling procedure but TPS61170-Q1 didn't worked even in boards from external CM.

    Sorry, I tried but can't take photo of such small IC, particularly its letters on top. We don't have such camera. If you have any additional comments, please do let us know.

    Thanks,
    jagdish
  • In reply to Jagdish:

    The fail rate of TPS61170-Q1 is very very low. Really no return till now.

    But Normally, the maximum storage time for the IC is two years. For some special sealed IC, it can be 5 years. That's why I want to check the letters on the top.

    Best Regards,
    Helen

    Boost DC/DC Solution

  • In reply to Helen chen:

    Hi Helen,

    Thanks for the inputs. Can I try date code, will it be useful to you?

    Regards,
    jagdish
  • In reply to Jagdish:

    You can found the date code on the top with magnifying mirror . It can help us troubleshoot the fail reason.

    Best Regards,
    Helen

    Boost DC/DC Solution

  • In reply to Helen chen:

    Hi Helen,

    Pls find below label that we got on ICs having date code. Is this useful?

    Regards,

    jagdish

  • In reply to Jagdish:

    No, it should be on the top of the IC.

    Best Regards,
    Helen

    Boost DC/DC Solution

  • In reply to Helen chen:

    Hi Helen,

    I could read following on IC top,

    RAP
    89K
    AR4E

    Regards,
    jagdish
  • In reply to Jagdish:

    Thanks. I'll check it. Please wait in patient.

    Best Regards,
    Helen

    Boost DC/DC Solution

  • In reply to Helen chen:

    This IC is manufactured in 2008,  10 years past. PLease stop to use it.

    Best Regards,
    Helen

    Boost DC/DC Solution

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