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TPS54531: Pin compatible TPS54531

richard lejeune
Prodigy 130 points
Part Number: TPS54531
Other Parts Discussed in Thread: TPS54335A

Hi,

One of our ODM used the TPS54531 as a POL.

Input range is 5V to 24Vdc.

Output Voltage is 1V /3A.

We immediately noticed the heat dissipation upon testing.

As i see, the 54531 does not include any low side Mosfet. So low output voltage efficiency will be BAD.

I would like to know if there is a PIN compatible Synchronous DC DC converter we can use to replace that chip.

As a temporary solution Input range can be lowered to 16Vdc.

Richard.

  • 0
    TI__Mastermind 34875 points
    Hi Richard,

    Non-synchronous converter is not a good choice for 1V output, pls try TPS54335 28V/3A in SO8 package.

    B R
    Andy
  • 0 in reply to Andy Chen
    Prodigy 130 points
    Hi Andy,

    Thank you for your reply.
    I do understand that we need a synchronous type.
    But what i need is a quick fix with the same pin-out if possible...
    I found multiple replacement on the TI product list, but none of them are pin compatible with the TPS54531.
    I can even use a 6 pin type if it fits better.
    I would like to test another converter without re spinning the board.

    Regards,

    Richard.
  • 0 in reply to richard lejeune
    TI__Expert 4875 points
    Hi Richard,

    I checked all the SO8 package synchronous solution in our product line and did not find one that is pin to pin with TPS54531. The only synchronous SO8 packaged buck is like TPS54335A family.

    For your current solution, what is the diode you are using? Have you tired to use two schottky diode in parallel to lower the forward voltage?

    Best,
    Anthony
  • 0 in reply to Anthony Lang
    Prodigy 130 points
    Hi Anthony,
    Thank you for the suggestion.
    The ODM used Diode Inc B240-A.
    I tried 2 diodes with minimal improvements.
    Also tried CDBA540-HF, no luck.
    Average current is roughly 2A on that POL.
    I will be looking to find a SOT26 replacement since they don`t require a gnd tab and easier to patch.

    regards,

    Richard.