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TPS50601A-SP: SYNC pin threshold

Ryan.Bishop
Expert 3900 points
Part Number: TPS50601A-SP

Hello,

The datasheet has spec'd the SYNC pin upper threshold at two test conditions: VIN=PVIN=3V (2.45V)   ~and~   VIN=PVIN=7V  (4.25V).

We will have VIN=PVIN=5.8V. However, we don't know what the minimum VIH will be for the SYNC pin at this supply voltage. We would like to run it from 3.3V logic, but can't tell if this will be sufficient.

Also, some extra questions: What is the recommend maximum voltage on SYNC pin? (as opposed to the absolute max of 7.5V).

Can SYNC voltage exceed VIN/PVIN and go up to 7V regardless of supply? Or should it be limited to 5.8V in our case? (Bonus: if SYNC voltage shouldn't exceed VIN/PVIN, and VIN is not equal to PVIN, which one is the limiting factor: PVIN or VIN? I would guess VIN).

Thank you!

Regards,
Ryan B.

  • 0
    TI__Mastermind 28625 points

    Hey Ryan,

    I don't have data at the moment, but we are working behind the scenes on trying to put something more specific in the datasheet.

    (You are not the first person to ask this question)

    I will say its highly unlikely at your VIN that 3.3 V logic will work. While I don't have data to disprove you, I would suggest level shifting it.

    We don't have a recommended max voltage on the SYNC pin.

    The SYNC pin can exceed VIN/PVIN regardless of supply. IF there is a supply dependence it would be noted in the ABS MAX Table.

    Thanks,

    Daniel