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TPS7H1101A-SP: VOUT Regulation

Luis Landy
Prodigy 100 points
Part Number: TPS7H1101A-SP

Hello,

We had a design escape where we see a voltage drop from the LDO's output pin to the power plane due to poor routing. This drop is before it gets to the power plane where the feedback resistors are. My question is would the LDO adjust to see the desired output at the plane since the feedback resistors are there or do the feedback resistors only regulate the output to be the desired voltage directly from the LDO's pins?

  • 0
    TI__Genius 12150 points

    Hi Luis,

    The LDO regulates to the point where the feedback is taken from, so it is possible to make up for some voltage drop caused by PCB routing by connecting the top feedback resistor at the node where you want to see the regulated voltage at.

    With that said, there is a limit to how much voltage drop the LDO can compensate for. If the voltage drop between the LDO's output pins and the point where the feedback is taken from is large enough, then the LDO will eventually reach a point where it can no longer continue raising the voltage at the output pins to overcome the voltage drop because it is running up against the dropout voltage.

    Thanks,

    Sarah