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TPS62810-Q1: About inductor / Cout

Lee, Sam
Expert 6025 points
Part Number: TPS62810-Q1

Hi team,

Could you please review the following schematic (VIN=3.3V, Vout=1.1V) of TPS62810-Q1?

-. Schematic uses L=1.5uH / Cout=32uF. Is it acceptable?

-. Anything else?

Thanks,

Sam Lee 

  • 0
    TI__Genius 14876 points

    Hello Sam,

    As mentioned in the Recommended Operating Conditions section (7.3), I recommend you use a maximum inductor value of 0.9uH, 

    I also advise you to use a 22uF capacitor at the input.

    Your regulation point is set so Vout=1.15V, do you need slight margin in your application?

    Thanks a lot!

    Regards,

    Dorian 

  • 0 in reply to Dorian Brillet de Cande
    TI__Expert 6025 points

    Hi Dorian,

    Thank you for your review. Can I ask one more? 

    I wonder why there is a limit to the maximum value. Can you explain the expected problem for inductors exceeding max. 0.9uH?

    Thanks,

    Sam Lee

  • 0 in reply to Lee, Sam
    TI__Genius 14876 points

    Hello Sam,

    Using higher values of inductor will mean different current storage capabilty and speed which was not designed for TPS62810.

    If your are using higher value of inductor than 1.5uH than your system might not meet all characteristics it has been specified for.

    Even if you adapt switching frequency, you might also see instability at load/line transients.

    Thanks a lot!

    Regards,

    Dorian