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LM317L-N: Asking about Maximum Output Current

Ahmed Sabry1
Intellectual 430 points
Part Number: LM317L-N

Hello,

why this part number LM317LM/NOPB  is considered as a cross-part number for LM317LD of ST as per the below link:

https://bomcross.ti.com/en/compare/LM317LD---Stmicroelectronics--vs--LM317LM%2FNOPB---Texas%20Instruments%20Inc

although LM317LD of ST     has a maximum output current of 200 mA  as shown in page 6/23 at the below datasheet:

https://www.st.com/content/ccc/resource/technical/document/datasheet/ee/4d/b2/bd/25/fe/44/2c/CD00000469.pdf/files/CD00000469.pdf/jcr:content/translations/en.CD00000469.pdf

can you clarify to me please.

LM317LM/NOPB

  • 0
    TI__Guru 50040 points

    Hi Ahmed,

    The ST datasheet shows a typical maximum current of 200mA, but the minimum is 100mA:

    The TI Datasheet describes the same as a current limit:

    When budgeting for supporting the maximum load current, both suggest that it should be less than 100mA.

    I hope this answers your question.

  • 0 in reply to JCHK
    Intellectual 430 points

    But according to your reply, the maximum output current for TI case will be 300 mA, not 200 

  • 0 in reply to Ahmed Sabry1
    TI__Guru 50040 points

    Hi Ahmed,

    When thinking about the current limit, it is when it can kick in. So if the current limit is closer to 100mA, then that is the maximum amount of current it can deliver. If the current limit is closer to 300mA then that is what it may be able to deliver. the 200mA is a typical number but normally it is best to make sure your designs maximum load current is less than the minimum current limit. 

    If you need to guarantee more than 100mA, something like the LM317M might be a better choice.

    I hope this helps.