• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 294 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS650864: VIN 5V Operation TPS6508640

Indravathi v
Prodigy 20 points
Part Number: TPS650864

Tool/software:

We are designing Zynq board 9EG for that we need 5V Operation of TPS6508640.

In datasheet we need to provide >5.6V to VSYS pin. If we give 5.8V to VSYS pin by using Boost converter is it ok.

If ok what is the max current drawn VSYS pin

  • 0
    TI__Mastermind 22205 points

    Hi Indravathi,

    5.8V is technically fine but you may need a bit of extra input capacitance to protect against any dips in the input voltage. A larger input voltage would be safer on VSYS if you want to stick with the 1uF capacitor recommendation.

    VSYS should only draw around 200mA but if you're using the VIN voltage for BUCK 1, 2 and 6 FET inputs it's possible a large current transient could drop VIN beneath the UVLO threshold.

    The FET input capacitors can help with this too but make sure the boost converter can source enough current for LDO5V and LDO3P3 at the minimum.

    Regards,

    James