LM2931 LDO Regulator SO-8

[Jerry Girard]

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.

 

[Terry Given]

Jerry Girard wrote:

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.

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

HTH

Terry

 

[James Meyer]

On Sun, 3 Apr 2005 23:32:09 -0400, "Jerry Girard" <jgirard1@yahoo.com> wroth:

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.

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 ľAMAX

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

 

[Jerry Girard]

This datsheet doesn't show anything clearly.

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

"Terry Given" <my_name@ieee.org> wrote in message
news:LC24e.15539$1S4.1604904@news.xtra.co.nz...
Jerry Girard wrote:

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.

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

HTH

Terry

 

[Terry Given]

Jerry Girard wrote:

This datsheet doesn't show anything clearly.

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

"Terry Given" <my_name@ieee.org> wrote in message
news:LC24e.15539$1S4.1604904@news.xtra.co.nz...
Jerry Girard wrote:

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.




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

HTH

Terry

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