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LM337: low temp co. regulator

Dogan Culum
Prodigy 30 points
Part Number: LM337
Other Parts Discussed in Thread: REF5010, , TPS7A33, LM137

Hello All,

For over 10 years I have been using LM337 and LM329DZ or BZ pair to have a low temperature coefficient regulator ( the circuit shown in every LM337 datasheet ). I need around 5-10mA output current. So I can also use a reference like ref5010 IC I guess. Or maybe a negative regulator with low temperature coefficient.

LM329DZ or BZ is an analog devices component and it is kind of expensive component. I am searching for a new way of having a -10V reference.

I have +15VDC and -15VDC power sources present in my PCB. I also use REF5010 in order to obtain 10V with current boost using a transistor ( for 10V I need around 50mA ).

I do not know why LM329 used in LM337 datasheet, how can I implement a suitable texas instruments reference.

Regards,

  • 0
    TI__Genius 12365 points

    Hi Dogan, 

    Thank you for reaching out. 

    Is your question related to the LM337, or is it for the LM329? 

    Can you share the proper datasheet for the LM337? We have several versions and the one for the regular LM337 1.5A negative regulator does not have any reference to the LM329. 

    If you need a negative voltage rail, I can recommend using the TPS7A39, this is actually a dual output for positive and negative rails.

    If only a single output is preferred, then the TPS7A33 is a good option. 

    If your question is for a voltage reference device like the REF5010, I can re-direct to the VRS group. 

    Best, 

    Edgar Acosta 

  • 0 in reply to Edgar Acosta1
    Prodigy 30 points

    Hello Edgar,

    On this datasheet is says LM129A, and also mentions LM329.

    In my application problem is that I need low temperature coefficient supplies because I power a loadcell. And my signal conditioning circuit is not differential. I have been using LM337 (TO220) and LM329DZ or LM329BZ for over 10 years. LM329 is expensive. I could not understand the datasheet how LM129A is used. What alternatives could I have from texas. If I choose 5V or 4V reference how can I modify resistor values.

    This is my current design.

    Is there any info about temperature drift for TPS7A33. I am using 1.5A version LM337 TO220 which is very large component for 20mA current output. I can use newer LDO too.

  • 0 in reply to Dogan Culum
    TI__Genius 12365 points

    Hi Dogan, 

    The LM129 and LM329 are devices from the same "family" : 

    Just like the LM337 and LM137 which is why you see both devices in the same Data Sheet. 

    Therefore, the LM129 is used in the same way and manner as the LM329, and they are both used to provide a more stable Vout for temperature drift. 

    For the Drift Data for the TPS7A33, looking at the accuracy specs over temperature is a good check: 

    And here is a plot for Line Regulation that shows temperature information as well. 

    Overall, we do recommend using a newer LDO like the TPS7A33. 

    Best, 

    Edgar Acosta