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TPS63020 not efficient at Vin 4V Vout 3V6

INg
Genius 3475 points
Other Parts Discussed in Thread: TPS63020, TPS630250, TPS63050, TPS63010

HI

My customer is using TPS63020 for his project.

He made the observation that TPS63020 is heating up at Vin = 4.0V and Vout 3V6

The area around TPS63020 get hot. Current drawn from supply is 600mA to 900mA when <10mA expected as whole circuit is at standby

I can only share the schematics using PM, pls let me know

Thanks very much

Ivan

  • 0
    TI__Guru**** 151530 points
    Since your input current is so much more than expected and the IC is getting hot, it seems that you have damaged the IC. Check you layout against the D/S example, as most damage is caused by poor PCB layout.

    As well, the newer TPS630250 is an even more efficient device than the TPS63020.
  • 0 in reply to Chris Glaser
    Genius 3475 points
    HI Chris

    Could i send you the material for a review?

    Ivan
  • 0 in reply to INg
    TI__Guru**** 151530 points
    Yes, of course. You can post them here or send me a message.

    As well, you can order the EVM to evaluate the IC with a known good layout.
  • 0 in reply to Chris Glaser
    TI__Guru**** 151530 points
    Thank you for sending the schematic and brief test report.

    There are several issues with your design. The schematic shows TAJ caps for Cin and Cout to the TPS63020. For any modern SMPS and per the D/S, the Cin and Cout must be ceramics. The high ESR of tantalum caps causes failures of SMPS.

    As well, there is a ferrite bead between the input cap and the IC. This is not allowed. The input cap is the most critical component in a buck converter and must be routed with the least impedance. Placing a ferrite bead or anything else there violates this. Place the ferrite bead between the input supply and input cap instead.

    It is difficult to follow the rest of their debugging without a full schematic and PCB layout. Can they use their finger or a thermal camera to see exactly which IC is getting hot? It may be the TPS63020, which indicates that it is damaged.

    But I would propose that you optimize your system for cost and size. The TPS63020 is way oversized for your low current rail. I would recommend the TPS63050 instead.

    As well, either the TPS63020 or TPS63010 can fill the role of the other buck-boost and be lower cost and smaller size with less external components. Finally, we have plenty of LDOs to choose from that are also lower cost.