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LM317: Is it possible to use Current Limiter Circuit for 7mA output

Shinichi Inoue
Guru 20241 points
Part Number: LM317

Dear Specialists,

My customer has a question about LM317 application circuit.

I would be grateful if you could advise.

---

For the 3-terminal regulator LM317DCY, there is a description of 3.5mAtyp and 10mAMAX in the column of minimum output current.

What will happen if it falls below 0.01A?

Oscillation, Regulation or etc. 

The application circuit is listed below. 

I'm thinking of attaching R1(180Ω) between OUT and ADJ and using it with 1.25V / 180Ω ≒ 7mA output.

Is there any problem?

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I appreciate your great help in advance.

Best regards,

Shinichi

  • +1
    TI__Genius 12060 points

    Hello Shinichi,

                             As you mention, the typical load current is 3.5mA. Obviously with a load current of 10mA, the device will function by meeting all specs. At a load current of 7mA, it is reasonable to expect that the device to be fully functional and the risk of the device falling out of spec is very low. Thanks!

    Regards,

    Srikanth   

  • 0 in reply to Srikanth Lolla Venkata
    Guru 20241 points

    Hi Srikanth,

    Thank you for your reply.

    In case of LM317, the device circuit current flows to output.

    This is the minimum load current(10mA).

    So I understand it needs to keep minimum current (10mA) 

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi