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LP5907: Temperature coefficient / drift of LP5907

Joel Li
Intellectual 2165 points
Part Number: LP5907
Other Parts Discussed in Thread: REF3330

Hi team,

Here is a question of LP5907.

Customer wants to use this device as a voltage reference for ADC. but I can't find any data about the temperature coefficient or temperature drift of LP5907 in datasheet.

Could you please supply me this data? or can you please tell me if the internal reference of LP5907 is low drift  (<50ppm/C) or not?

Thank you!

Joel Li

joel-li@ti.com

  • 0
    TI__Mastermind 22610 points

    LP5907 is considered a 'general purpose low drop-out voltage regulator', it has no specifications that would qualify it to be considered a 'precision voltage reference'.

    The typical LP5907 Vout-vs-Temperature (normalized to 25°C) is shown in the datasheet at Figure 7.

  • 0
    TI__Intellectual 1540 points

    Hi Joel,

    I am the apps contact for all series and shunt voltage references. Can you please let me know a bit more about the application so that I can give you the best part recommendation possible?

    If you are looking for low power and small package, our best option is the REF33xx family.

    Regards, Diego

  • 0 in reply to Diego Lewis
    TI__Intellectual 2165 points

    Hi Diego,

    Thank you!

    Actually, customer need a very low cost reference. Since LP5907 has so large drift as 55ppm, maybe we still need to find a reference. seems REF3030 is the only choice, REF3330 is still high price here.

    Do you think so?

    Thanks,

    Joel

  • 0 in reply to Donald Jones
    TI__Intellectual 2165 points

    Hi Donald Jones,

    Thank you.

    But this data can not be found in any datasheet of LP5907.

    Do we have some LDO with lower than 20ppm/C output drift?

    Thank you!

    Joel 

  • 0 in reply to Joel Li
    TI__Intellectual 1540 points

    Hi Joel,

    I agree with you that the REF3030 is our most cost competitive solution under 55ppm/C between 0 to 70C. 

    It is also important to note that voltage references, unlike LDOs, have a small initial voltage tolerance. In the case of the REF3030, the initial accuracy when shipped out of our factory at the given datasheet conditions is 0.2%. 

    Regards, Diego

  • 0 in reply to Joel Li
    TI__Mastermind 22610 points

    " ... But this data can not be found in any datasheet of LP5907. ..."

    Because 'Tempco' is outside the standard linear voltage regulator definition, including the LP5907.

    However, 'Tempco' is a standard ensured specification for voltage reference.

    www.ti.com/.../voltage-reference-products.page