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WEBENCH® Tools/LM137: LM137

Raza Shah
Prodigy 165 points
Part Number: LM137
Other Parts Discussed in Thread: LM317

Tool/software: WEBENCH® Design Tools

As er the description of LM137 it has adjustable output range of -1.2 to -37V . An di need -0.55V for one of my IC so is it possible that output of LM137 is followed by a diode to get -0.55V.

Or any other voltage regulator that can give the range of 0V  to -1V with minimum of 250mA.

Thanks

  • 0
    TI__Mastermind 22610 points

    The choice of negative voltage regulator options is limited.

    Your proposal of inserting a diode in series with the LM137 output to reduce the voltage by one diode is OK as long as voltage accuracy is NOT a high priority.

    If there is +1.2V available, it might be possible to reference the LM137 ADJ pin to that point, which would provide an offset. Of course this adds to the circuit complexity.

    The concept for this 'offset' scheme can be seen in the LM317 datasheet, it just needs to be revised to support the negative LM137.

    See ... Figure 12. 0-V to 30-V Regulator Circuit

    www.ti.com/.../lm317.pdf