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LM385-ADJ: Conflict of LM385-ADJ spice model and LM385-ADJ datasheet

Prodigy 20 points

Replies: 6

Views: 423

Part Number: LM385-ADJ

Dear TI Staff

I downloaded LM385-ADJ spice model from your website, I simulate on LTspice and follow the circuit as I attached. I found that it is not working. But when I swap R2 and R3 the result is correct.

Which one I should trust between datasheet or this spice model? If the spice model is wrong could you provide the correct one?

Remark:

Datasheet link  -->http://www.ti.com/lit/gpn/lm385-adj--

Spice model link -->www.ti.com/.../snvmb82<--

Circuit picture below

Best regards,

Sun

  • Hi Sun,

    The datasheet should be correct. I have ordered some devices of this flavor because I do not have them currently. I can try this

    Is there a reason you want to use a  LM385 vs a LM4041-ADJ or ATL431LI? I can confirm that both of those devices datasheet and models match.

    -Marcoo

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    If you feel your thread is resolved, please selected Answered.

    If you are using the TL431, check out the new ATL431LI for improved system performance in a p2p package or a ultra  small X2SON (1mm x 1mm x 0.4mm)

    Check out: Voltage Reference Design Tips For Data Converters a new app note that discusses voltage reference error and how it affects ADCs/DACs

  • In reply to Marcoo Z:

    Dear Marcoo

    Thank you for your following about my issue.

    I got this design from the last project of my company, then I use this circuit to be a reference for my current project.

    I will look forward to your checking.

    Best regards,

    Sun

  • In reply to Narukom Sakoonvilaikidcharoen1:

    Hi Sun,

    I requested samples of the LM385. They have arrived and I will verify the datasheet these coming days.

    -Marcoo

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    If you feel your thread is resolved, please selected Answered.

    If you are using the TL431, check out the new ATL431LI for improved system performance in a p2p package or a ultra  small X2SON (1mm x 1mm x 0.4mm)

    Check out: Voltage Reference Design Tips For Data Converters a new app note that discusses voltage reference error and how it affects ADCs/DACs

  • In reply to Marcoo Z:

    Hi Sun,

    The device matched the datasheet. I need to look at why the spice model did not function the same way.

    I will feel confident using the device schematic that you have posted.

    -Marcoo

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    If you feel your thread is resolved, please selected Answered.

    If you are using the TL431, check out the new ATL431LI for improved system performance in a p2p package or a ultra  small X2SON (1mm x 1mm x 0.4mm)

    Check out: Voltage Reference Design Tips For Data Converters a new app note that discusses voltage reference error and how it affects ADCs/DACs

  • In reply to Marcoo Z:

    Dear Marcoo

    Thank you for your help, so I can move forward with my project.

    Also could I have this spice model of LM385 after you have the correct one?

    Best regards,

    Sun 

  • In reply to Narukom Sakoonvilaikidcharoen:

    Hi Sun,

    I agree that the model is not working properly. I can look into correcting the model or removing the non functional model. A fixed revision will take a while so I would not count on it in the next coming month.

    If you don't need the low Iq of the LM385, you can use a LM4041-N ADJ or TL431LI and those have both working models and a variety of package options.

    -Marcoo

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    If you feel your thread is resolved, please selected Answered.

    If you are using the TL431, check out the new ATL431LI for improved system performance in a p2p package or a ultra  small X2SON (1mm x 1mm x 0.4mm)

    Check out: Voltage Reference Design Tips For Data Converters a new app note that discusses voltage reference error and how it affects ADCs/DACs

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