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TLV62569: Both High-side and Low-side MOSFET Short Issue

KevinZhang123
Expert 5750 points
Part Number: TLV62569

Hi, Team

My TV customer is using TLV62569 in their TV board to provide core power of processor RK3128H.

The input voltage is 5V, and output voltage is 0.954V ~ 1.395V. CPU controls the output voltage by 200kHz PWM signal.

Customer manufactuer 200 units and find 1 units failure. Both high-side and low-side MOSFET of TLV62569 are shorted.

Here is customer schematic. Could you help to check whether there is any issue? What is the posible cause?

Thanks

Kevin

  • 0
    TI__Expert 8420 points
    Hi Kevin,

    Having a short on both MOSFETs indicates an EOS event. We need to find out were this comes from.
    Regarding the schematic, I would recommend to add more output capacitance (2x22uF) as recommended in table 4 of the datasheet
    Could you share the layout for reviewing?

    Usually a spike in the VIN or SW pin could cause this type of issues. Could you share the layout for reviewing? Could you precise where they found the failure? (in-circuit test, functional test, production test...etc)

    Regards
    Sabrina
  • 0 in reply to Sabrina
    TI__Expert 8420 points
    This thread is being investigate through mail as it need deeper understanding of the failure type and scenario in this particular case