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TPS65217CEVM: PGOOD and LDO_PGOOD sense accuracy.

Piotr Bojda
Prodigy 10 points
Part Number: TPS65217CEVM

Tool/software:

Hello,

I have a quick question about a TPS65217CRSLT PMIC.
The PGOOD and LDO_PGOOD signals are pulled low when the DCDC or LDO output voltages are out of the regulation.

The datasheet states only an output voltage regulation accuracy in range up to +/-3%.

Are the PGOOD and LDO_PGOOD signals:
- sense accuracy similar to the regulation accuracy?
- sense the output voltages or just reports states of the converters?

Best Regards,
Piotr

  • 0
    TI__Guru* 77771 points

    Thank you for your inquiry. US and Europe TI offices are closed on April 18th. This thread has been assigned but you will receive a response early next week. Thank you for your patience!

    Regards,

    Katie

  • 0 in reply to Katie Pier
    TI__Expert 6225 points

    Hi Piotr,

    Thank you for reaching out on e2e.

    I am replying to the thread as device expert Sarah is out this week.

    Those comparators monitor the output voltage and if they fall outside the threshold (90%) then they will be pulled low. Regulation accuracy (3%) is much tighter than PG threshold.

    Sathish

  • 0 in reply to Sathish Vallamkonda
    Prodigy 10 points

    Thank you Sathish for the answer.

    I have a few more questions, just to clarify by doubts.

    Is it means that the threshold is +/-10% of the measured voltage, or of the supply (3V3)?
    Is the temperature error and hysteresis also included into this 10%?

    Best regards,
    Piotr

  • 0 in reply to Piotr Bojda
    TI__Genius 9477 points

    Hi Piotr, 

    The PGOOD threshold is +/-10% of the set output voltage of each converter/LDO. 

    The PGOOD comparators are monitoring the output voltage.
    I am not entirely sure on what you mean by the inclusion of temperature error and hysteresis.
    The 10% threshold is wide enough to account for any minor error due to temperature, the intention of the PGOOD signals is to report when the output falls below 90% of the set value, indicating the rail has fallen out of regulation. 

    Hope this helps to clarify, let me know if you have further questions.