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TLV1117: Output voltage

Part Number: TLV1117

Dear team, 

Please review below customer issue and schematic and let me know your opinion. 

- Vin : 5V , desired output : 3.5V  but output result is 4.2V. Please review a reason of abnormal output. 

Thank you. 

  • HI Nam,

    I believe you are seeing the effects of the ADJ pin current.

    Where VREF is 1.25V, IADJ is 120uA, and R2 is 7.5K and R1 is effectively 4.9K.

    When I use the above values in this formula, I get a voltage over 4V as well. Reducing these resistors down to 490Ohm and 750Ohm makes the effects of the IADJ negligible. 

    Note these values actually produce 3.25V. If you would like 3.5V, I think R177 should be 850Ohm with R175+R76=490Ohm.

    I hope this answers your question.