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LM5168-Q1: Temporary applied voltage on output

Robert Smith
Intellectual 950 points
Part Number: LM5168-Q1

Tool/software:

Hey all,

I've got a peculiar situation here. The output of this buck is set to 6V through the feedback resistors, but I need to have 8.2V on the output temporarily for One Time Programable programming during production.

So my question is if I have 11V or greater on Vin, 8.2V on the SW pin, and the regulator is set to output 6V, do you expect for there to be any potential issues with this for the device? I'm assuming the LM5168-Q1 will just be at a 0% duty cycle until the output voltage goes under the set output voltage of 6V. This will be for a short duration.

Thanks,

Robert

  • 0
    TI__Intellectual 2240 points

    Hi Robert,

    If the output voltage is set to 6V and if you are applying 8.2V externally, the switching will stop and it shouldn't cause any issue. However you need to make sure few things as mentioned below.

    1. The output caps. should able to handle 8.2V DC ratings.

    2. The input voltage should be higher than 8.2V plus drops, else there is direct path from output to input through high side FET body diode.

    3. There should not be overshoot on 8.2V which can cause damage to FB pin due to Abs. Max ratings.

    Thanks,

    Nitya