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TPS65708: Alternate TI part with lower thermal profile

Shiva Sinha
Prodigy 10 points
Part Number: TPS65708
Other Parts Discussed in Thread: TPS650330-Q1, LM26480

My application currently uses a TPS65708YZHR, which has a 5V input and creates required 3.3V, 1.8V, and 1.2 V rails. I'm trying to reduce the thermal profile of my device, and based on temperature measurements this PMC is the hottest component on my PCB. Are there alternate TI power management chips that can provide a lower thermal profile? 

  • 0
    TI__Genius 10200 points

    Hi,

    I have some requests to help identify an alternative:

    • The TPS65708 has four outputs - is one of them not used in your application?
    • What are the load currents on each rail?

    Thanks,

    Gerard

  • 0 in reply to Gerard Copeland
    Prodigy 10 points

    Thank you for the reply and your questions.

    To your first point, I mistakenly left off the 2.8V. Hence all four outputs are leveraged. Also, I use the 3.3V output as an input to generate the 2.8V LDO, and I use the 1.8V output as an input to generate the 1.2V LDO. See below.

    With regards to your second point, I am estimating the downstream circuits are drawing: 2.8V draws 35 mA, 1.8V draws 250 mA, and 1.2V draws 100 mA.

    Thank you,

    Shiva

  • 0 in reply to Shiva Sinha
    TI__Genius 10200 points

    Hi Shiva,

    Thanks for sharing. For a 5 V POC application, the TPS650330-Q1 can be used in a similar configuration. It has 3 buck converters for improved efficiency, and the package includes a thermal pad to reduce internal heating. However, this device has an input UVLO of 4.68 V (typ), so it should not be used if you expect VPOC to drop below the 5 V nominal. 

    If you do expect variation in the minimum VPOC, the LM26480 is another option (larger package than the TPS65708 with a thermal pad), but it requires quite a few more external components. 

    Thanks,

    Gerard