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LM20154: NC pin connection and Design spreadsheet

Satoshi
Guru 19645 points
Part Number: LM20154

Please let me know about two points below about LM20154 design.

①Datasheet P2 is described about "NC pin must be connect to GND".

　What is occur abnormal operation on NC pin floating condition?

　Is LM20154 occur only noise? or is there large problem? 

　i want to know relation about NC pin and internal connection.

②I didn't find LM20154 Design spreadsheet below.

　Is these tool available?

http://www.tij.co.jp/tool/jp/LM20154DESIGN-CALC

Best regards,

Satoshi

  • 0
    TI__Genius 10860 points

    Hi Satoshi-san,

    1) Please follow the datasheet recommendations to guarantee proper functionality. We only guarantee performance and smooth operation within our recommendations through design and test.Note that I cannot support you for questions outside our recommendations.

    2) Let me check the missing tool for you and come back to you.

    Best regards,

    Britta

  • 0 in reply to Britta Ruelander
    Guru 19645 points

    Britta-san

    Thank you for reply,

    About NC pin, is there particular information of NC pin internal connection?

    One customer already designed open, I want to check degree of NC pin no connection.

    (I think that affect is only noise, is it correct?)

    By the way, please let me know about full name of NC pin.

    One customer though "Non Connect" pin, and designed NC pin open.

    Best regards,

    Satoshi

  • 0 in reply to Satoshi
    TI__Genius 10860 points

    Hi Satoshi-san,

    please understand that I cannot share IC internal information with you which is not disclosed in the datasheet. Besides, we can only guarantee proper functionality within our recommendations.

    However I understand that the current description can be misleading and we will work on updating the wording to avoid confusion for the customer.

    Still, please connect the NC pin to GND as required.

    Best regards,

    Britta

  • 0 in reply to Britta Ruelander
    TI__Genius 10860 points

    Hi Satoshi-san,

    I just wanted to let you now that the LM20154 Design spreadsheet is back online and available for download : https://www.ti.com/tool/LM20154DESIGN-CALC

    Please let me know whether this post can thus now be closed as I assume the problem was solved.

    Thanks and best regards,

    Britta