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Original question:

TPS5450 instability & outright failure @ certain Vin voltages

TPS5450: TPS5450

Per Jannersten
Prodigy 10 points
Part Number: TPS5450

We designed an add on card with TPS5450 to supply a RPi 4 with 5V. We use 24V in.

Unfortunately the entire batch (1k) had to be replaced with off the shelf DC/DCs from China. We are now planning for the next batch and notice that the issue https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/260390/tps5450-instability-outright-failure-certain-vin-voltages is marked RESOLVED. What exactly does "resolved" mean? Has the chip, or the recommended layout, been amended? If so, when? 

Per Jannersten

  • 0
    TI__Guru 50120 points

    Hi.

    There is nothing specifically wrong with the device. Looking at the old post from over 9 years ago, John provides some guidance on the schematic in that ENA should not be tied directly to VIN. ENA has a maximum pin voltage of 7V so tying it directly to VIN would result in damage to the part.

    Resolved is usually clicked on the customer end to indicate that the issue they are experiencing has been resolved and the thread is to be closed.

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 10 points

    Thank you for prompt reply.
    We will make a few boards and report back after testing (it will take a while because everything is slow these days).

    Per Jannersten