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TPSM53604: How to use the TPSM53604RDAR

ikemoto.kouji
Prodigy 30 points
Part Number: TPSM53604

I would like to insert a Schottky diode in the output so that the output is held even if the input voltage drops, are there any concerns?

Best Regards.

  • 0
    TI__Guru 50120 points

    Hi,

    Yes this method works. One thing I would suggest is to place it on the input instead of the output similar to what is shown in this technical article. 

    This is an effective method at preventing reverse current. The diode placed at the supply of the LDO becomes reverse-biased during a reverse current condition and does not allow any current to flow. Also placing the diode on the input will have less current flowing through it at full load than on the output. 

    https://www.ti.com/document-viewer/lit/html/SSZT658

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 30 points

    Hi,Jimmy
    Thank you for your prompt confirmation and response.
    The example in the technical article you gave us the information is an LDO, can we assume the same for this switching regulator?
    In the LDO, if a diode is used on the input side, no reverse current flows, and if a capacitor is placed on the output side, it seems that it can be held, but in the switching regulator, there is a FET on the low-side side, so this effect seems to cause the reverse current to flow through the FET on the low-side side, but the way I think about it is Am I wrong?

    Regards,

  • 0 in reply to ikemoto.kouji
    TI__Guru 50120 points

    Hello,

    Putting a diode in series with the input/output works the same way in either LDO or SMPS. The diode prevents reverse current from flowing back through the device and into the battery. 

    Attached is the reverse current mechanism: https://www.ti.com/lit/an/slua962/slua962.pdf

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 30 points

    Hi,Jimmy


    Thank you for your prompt response. I understand now.
    Thanks also for sharing the application note.
    Noted.

    Regards,