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LM2931 LDO Regulator SO-8

Discussion in 'Electronic Design' started by Jerry Girard, Apr 4, 2005.

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  1. Jerry Girard

    Jerry Girard Guest

    Does anyone know how the polarity of operation for the inhibit pin that is
    available on the SO-8 package only? The data sheet does not describe the
    function of the inhibit input, other than calling it an inhibit. Which
    polarity inhibits the regulator? Thanks.
     
  2. Terry Given

    Terry Given Guest

    RTFM. Page 4 shows a pretty picture with a switch for on/off control. 0V
    = ON, Vcc via 51k = OFF

    HTH

    Terry
     
  3. James Meyer

    James Meyer Guest

    Have you looked at the datasheet available at National? It clearly
    shows:

    On/Off Threshold Voltage VO=3V
    On 2.0 1.2 VMAX
    Off 2.2 3.25 VMIN
    On/Off Threshold Current 20 50 µAMAX

    The figure on page four shows the ON/OFF pin pulled up to Vcc/IN with a
    51K resistor for "off" and the pin is directly tied to ground/GND for "on".

    Jim "From the horse's mouth" Meyer
     
  4. Jerry Girard

    Jerry Girard Guest

    This datsheet doesn't show anything clearly.

    http://www.st.com/stonline/books/pdf/docs/6740.pdf

    RTFM. Page 4 shows a pretty picture with a switch for on/off control. 0V
    = ON, Vcc via 51k = OFF

    HTH

    Terry
     
  5. Terry Given

    Terry Given Guest

    I sit corrected. What a thoroughly unhelpful datasheet. FABM would have
    been more appropriate (Find A Better Manual).

    ST have some of the worst datasheets.

    Cheers
    Terry
     
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