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Inquiry regarding supply current (IS) on LMV934-N

Atsushi Okui
Genius 4015 points
Other Parts Discussed in Thread: LMV934-N

Hello, all

Now we have one inquiry regarding supply current (IS) on LMV934-N from our customer.

Please refer to the item below, and feedback us with your comment.

In accordance with your announcement that LMV934IPWR was obsoleted, we are now using LMV934MTX/NOPB as a replacement of LMV934IPWR.

However, as our production stage, the number of scrapping item when screening this device regarding IS (supply current) was more increased than LMV934IPWR.

Per channel, most of LMV934IPWR could perform 100uA, but some LMV934MTX/NOPB could not achieve this performance as LMV934IPWR.

When referring your datasheet of each devices on the website below, the minimum supply current are not defined clearly. (103uA for Typ and 185uA for Max are same)

http://www.tij.co.jp/jp/lit/ds/symlink/lmv934.pdf

http://www.ti.com/lit/ds/snos993l/snos993l.pdf

Please let us clarify how much minimum supply current could be defined on LMV934-N.

We thank you in advance for your information.

Best regards,

  • 0
    TI__Mastermind 49966 points

    Hello Atsushi,

    The LMV934 was originally introduced by National Semiconductor. TI then second-sourced it. After TI acquired National, TI decided to close the fab that produced TI's LMV934, which lead to the obsolescence of the LMV934IPWR, leaving the National version. The National version (LMV834-N) is still produced in the original National fabs.

    These are two devices that were produced by two different companies, by two different designers on two different processes. They meet the same basic specs, but are different devices internally. So they will have minor differences and are NOT the EXACT same device. If the customer is performing incoming inspections, then they will need to re-qualify the new device and change the limits.

    We do not guarantee a minimum supply current, only the maximum. A lower supply current is considered to be good.

    Both datasheets have a Supply Voltage vs Supply current graph that shows the typical supply current over supply and temperature (Fig 1 or Fig 2). The LMV934-N supply current is slightly higher (~10uA) than the LMV934IPW, but both are below the guaranteed limits.

    Regards,

  • 0 in reply to Paul Grohe
    Genius 4015 points

    Hello, thank you for your reply on this inquiry.

    Please let us inform your regarding the background  on this matter.

    We are using this device for IV amplifier for LED, then our concerning on this inquiry is some influence on Slew Rate, whether pulse width for dimming could be kept 80usec when supply current is decreased. 

    When referring this datasheet, minimum Slew Rate is not defined either, therefore we would like to clarify about the detailed influence on Slew Rate and accepted minimum supply current for considering correct screening base.

    We thank you once again for your information.

    Best regards,