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TCA9416: TCA9416DDFR

Kelley Kim
Prodigy 90 points
Part Number: TCA9416

Tool/software:

Dear,

Regarding TCA9416DDFR, 

The 3.3V LDO output shows an output error of 4.2V when TCA9416DDFR 2pcs are mounted, but the output 3.3V shows correctly when the chips are removed. 

Please refer to below picture. 

Would you help on this? please kindly advise me technical support. 

  • 0
    TI__Guru 50206 points

    Hi Kelley,

    I presume the schematic shown is not the full schematic and external resistors may be used with the LDO supply.

    Note that such issues are common with LDOs that cannot sink current. 
    You can further verify by using a different power supply, removing pull-ups (if no pull-ups and issue persists, further use a pull-down of about 100K ohms on the LDO to verify), thanks. 

    Best Regards,

    Michael.