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TPS62130: When connect to a 3s battery 12.6V (with low internal resistance), the buck chip is always burned out

user4594141
Prodigy 10 points
Part Number: TPS62130

When connect to a 3s battery ， I always see a spark.

But when connect to a power supply , the buck chip is ok, and can support a 2A load.

After I connect  one 1 ohm resistor in series on the input wire, the buck works ok.

How I solver the problem, not using a external resister?

  • 0
    TI__Expert 5425 points
    Did you try to disable the converter while plugging in the battery? Did you measure the waveform of the input voltage at the supply terminals of the TPS62130 while plugging in the battery?

    When I look on your layout I do not see a GND return for the input capacitors (e.g. C204). For reliable operation the input capacitor loop (CIN - VIN - PGND - CIN) must be low impedance. We have a layout example in the datasheet showing how this can be done.
    I strongly recommend to improve your layout in this respect, since this is one of the most common root causes for failures like you describe it.