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TPS7A19: VEnable higher than Vin

arnaud douville
Prodigy 160 points
Part Number: TPS7A19

Hi,

I've a new board with 2 TPS7A1901. First is used to convert between 5V to 3.3V while second is used to convert from 2.5V to 1.8V:

As shown above, schematics are (almost) the same; as well as layout.

First component (U60) works without any problem, while second fails (PG remains low, VOut remains low). EN_VCC_GROUP4 is +3.3V when asserted.

According datasheet, VEnable should be higher than +1.7V (VEN_HI) with a max value of +40V. So it should be OK but as mentionned it does not work...

Is it OK to have a VEnable at +3.3V if VIn is +2.5V? May I need a resistor voltage divider on second TPS7A19?

Many thanks!

  • 0
    TI__Guru 55940 points

    Hi Sylvain,

    You are able to have Ven higher than Vin for the TPS7A19; however, your input voltage must be above the UVLO threshold for the output to enable.  Please note that the minimum Vin for TPS7A19 is 4 V for proper operation.

    Very Respectfully,

    Ryan