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LM49450: VCC_IO33V and VCC_LVS5V is short circuit when we using the LM49450

Hope Chen
Expert 1030 points
Part Number: LM49450

Dear,     

     We found the VCC_IO33V and VCC_LVS5V is short circuit when we using the LM49450 in the PCBA .Which will  lead to MCU overvoltage and the mcu can't work normal.

      PS: The ripple of he VCC_IO33V and VCC_LVS5V is normal

    could you help share the more detail block diagram about the LM49450 ，and give some suggestions for the issue

SCH is as below

  • 0
    TI__Guru** 102405 points
    Hi Hope,

    There is not more information than what's shown in the data sheet.
    I think we haven't seen an issue like this before. Is this a short between supplies? or short from both supplies to ground? Have you verified this is not caused by any hardware/connection problem.

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio and Actuators
  • 0 in reply to Ivan Salazar
    Expert 1030 points

    Dear Ivan Salazar，

               After measuring the LM49450，we had found there have a short between the PIN10 and PIN 18、PIN24 in the LM49450. So I confirm the issue isn't caused by hardware

    Thanks a lot