[SI-LIST] Re: Wide input range LDO

Adeel, an LDO is by definition a linear device and the current at the input 
is always equal or greater than the current at the output.  Kris is 
right.  You need to change your specification, or buy lots of Freon.

Steve.
At 05:18 PM 5/24/2005 +0500, Adeel Malik wrote:
>Hi Kris,
>                 Thanks for the feedback. In fact the 250mA current
>output requirement is  not at 12 Volt input. I needed an extension of
>MCP1701 or TC55 device that can accept the nominal voltgae of 12 volts
>(rather than 10 volts as is the case with microchip device) keeping all
>other specs (package,Pin numbering .... etc ) the same.
>
>Adeel.
>
>-----Original Message-----
>From: Kris Verbeeck [mailto:krisverbeeck@xxxxxxxxx]
>Sent: Tuesday, May 24, 2005 2:49 PM
>To: adeelmk@xxxxxxxxxxx
>Subject: Re: [SI-LIST] Wide input range LDO
>
>Hi Malik,
>
>I hope you don't mind me saying, but I'm afraid you're
>not going to find what you're looking for. Simple
>calculation (7V * 0.25 = 1.75) that you plan to burn
>1.75W in a tiny SOT-23. I don't think it's gonna
>happen.
>
>Anyways, here's a link with good quality LDO's you may
>want to check out. ->
>http://www.linear-tech.com/pc/categoryProducts.do
>
>Hoping others will prove me wrong,
>
>Kris Verbeeck.
>
>--- Adeel Malik <adeelmk@xxxxxxxxxxx> wrote:
> > Hi All,
> >             In our low Power-Impedance design we
> > require an LDO that can
> > accept 12V input voltage for its stable 5 volt
> > output in 3-Pin SOT-23 or
> > SOT-89 package. The output current requirement is at
> > least 250mA with
> > the quiescent current consumption of about 2uA or
> > less.
> > I have searched the web and was able to find TC55
> > and MCP1701 from
> > Microchip but the only problem is that their input
> > voltage is limited to
> > 10Volts. Can someone help me finding the aforesaid
> > LDO.
> >
> > Regards,
> > Adeel Malik
> >
> >
> >
>------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in
> > the Subject field
> >
> > or to administer your membership from a web page, go
> > to:
> > http://www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the
> > Subject field
> >
> > List FAQ wiki page is located at:
> >
> > http://si-list.org/wiki/wiki.pl?Si-List_FAQ
> >
> > List technical documents are available at:
> >                 http://www.si-list.org
> >
> > List archives are viewable at:
> >               http://www.freelists.org/archives/si-list
> > or at our remote archives:
> >               http://groups.yahoo.com/group/si-list/messages
> > Old (prior to June 6, 2001) list archives are
> > viewable at:
> >               http://www.qsl.net/wb6tpu
> >
> >
> >
>
>
>
>__________________________________
>Do you Yahoo!?
>Yahoo! Small Business - Try our new Resources site
>http://smallbusiness.yahoo.com/resources/
>
>------------------------------------------------------------------
>To unsubscribe from si-list:
>si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
>or to administer your membership from a web page, go to:
>http://www.freelists.org/webpage/si-list
>
>For help:
>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>List FAQ wiki page is located at:
>                 http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
>List technical documents are available at:
>                 http://www.si-list.org
>
>List archives are viewable at:
>                 http://www.freelists.org/archives/si-list
>or at our remote archives:
>                 http://groups.yahoo.com/group/si-list/messages
>Old (prior to June 6, 2001) list archives are viewable at:
>                 http://www.qsl.net/wb6tpu
>


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: