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TPS543C20A:circuit review

Luis Kim
Prodigy 30 points
Part Number: TPS543C20A
Other Parts Discussed in Thread: TPS546C20A

hello.
I would like to request a review of the TPS543C20A circuit.

I don't know how to apply the EN and PGD pin connections.

I would like to configure it by connecting 1.8V IO to the EN and PGD pins.
Please advise on how to apply it.3010.TPS543C20A.pdf

  • 0
    TI__Guru 56785 points

     

    Please download the TPS543C20A Excel Calculator and Schematic Review Checklist from the TPS543C20A product folder Design and Simulations Tools sections:

    - https://www.ti.com/product/TPS543C20A#design-tools-simulation 

    The design tool and schematic review checklist is here: https://www.ti.com/tool/download/SLURB00 

    When you have the design tool filled out with your design targets and selected components, attach it to this thread and I can help review.

    Also, please follow the Schematic Review Checklist and perform your own schematic check.  If you have any questions, I can help answer them.

    Luis Kim said:
    I don't know how to apply the EN and PGD pin connections.

    The EN pin pin enables output conversion on the TPS546C20A when it is pulled high,  It is internally pulled up weakly to BP, but it's threshold is 1.45V - 1.75V, so a 1.8V source may not be able to enable high enough to ensure turn-on.  I would recommend using a MOSFET close to the TPS543C20A with it's drain connected to EN and a 100kΩ pull-up to BP, then use the 1.8V pin to drive the gate of the MOSFET.  To ensure that MOSFET does not turn-on  if the driving source is not enabled, you can use a second pull-up resistor to 1.8V to turn the MOSFET on and pull EN low until the 1.8V IO pin pulls the gate low and turns off the MOSFET.

    The PGD pin is an open-drain Power Good output.  It requires an external pull-up, TI recommends the pull-up on PGD be 5mA of less when PGD is pulled do ground with a resistance of 30Ω-60Ω.  For a 1.8V pull-up, select a pull-up resistor of 360Ω or greater.