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'[OT]ish: low power regulator'
1998\06\22@070636 by org Hager

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Hi all!

Does anyoune know of a voltage regulator that does not swallow a couple of
mA even with no load? I'm using a 78L05 right now, but even when my
circuit (PIC + some external stuff) is in standby mode with just some uA
of supply current, the battery (9V block) must deliver about 2mA to the
L05, just to keep it running. This is unacceptable as I want to let the
thing run all the time. And yes, I *need* the 9V (4*1.5 is not an option)
;-).

Any help would be appreciated.
Georg.

1998\06\22@090135 by John Tibbits

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Linear Technology at linear-tech.com has three terminal regulators that draw
much less current. They also have app notes that show regulators that only
draw 1-2 microamps.

Regards,
John Tibbits
{Original Message removed}

1998\06\22@112135 by Dave Miga

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Georg Hager wrote:
>
> Hi all!
>
> Does anyoune know of a voltage regulator that does not swallow a
> couple of
> mA even with no load? I'm using a 78L05 right now, but even when my
> circuit (PIC + some external stuff) is in standby mode with just some
> uA
> of supply current, the battery (9V block) must deliver about 2mA to
> the
> L05, just to keep it running. This is unacceptable as I want to let
> the
> thing run all the time. And yes, I *need* the 9V (4*1.5 is not an
> option)
> ;-).
>
> Any help would be appreciated.
> Georg.
use the National LM2931Z-5.0 (Digi-Key). Has uA standby and low (<0.7)
volt dropout...
 -Dave Miga, Electronic Design Specialists http://www.eds-inc.com

1998\06\22@161027 by Lewis H. Cobb

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Hey! Something that I can contribute to on this list!  I've been asking
questions up to now but this is something I can pass along some information
on - :)

Try the LM2936Z-5.0  It's a TO-92 - same pin-out as the L05 but only sips
about  15uA quiescent current - I'm using them in a 9V thing I'm building
and they work fine, with two slight downside issues -

1) They are about 3-5 times more expensive than the 'L05  I have seen them
at up to 3 bucks a pop.

2) They require a 10uF cap on the output to prevent oscillations - I've got
this "rank" looking electrolytic - it's bigger than the regulator!

Hope this helps.

Lewis


At 01:05 PM 6/22/98 +0200, you wrote:
{Quote hidden}

1998\06\22@173536 by Sean Breheny

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On Mon, 22 Jun 1998, Lewis H. Cobb wrote:

> Hey! Something that I can contribute to on this list!  I've been asking
> questions up to now but this is something I can pass along some information
> on - :)
>
> Try the LM2936Z-5.0  It's a TO-92 - same pin-out as the L05 but only sips
> about  15uA quiescent current - I'm using them in a 9V thing I'm building
> and they work fine, with two slight downside issues -
>
> 1) They are about 3-5 times more expensive than the 'L05  I have seen them
> at up to 3 bucks a pop.
>

Can't you use a tantalum or ultra-small electrolytic?

{Quote hidden}

Sean

1998\06\22@230750 by Harold M Hallikainen

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       National has a micropower +5V regulator that I used in a sleeping
PIC project.  Check out regulators at http://www.national.com .

Harold


On Mon, 22 Jun 1998 13:05:59 +0200 Georg Hager
<spam_OUTghagerTakeThisOuTspamTHEORIE3.PHYSIK.UNI-ERLANGEN.DE> writes:
{Quote hidden}

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1998\06\22@230758 by Guy Farebrother

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Take a look at the Seiko 807xx series. They use 1 uA with no load and still
provide good output current when you need it.

Guy

{Original Message removed}

1998\06\23@021951 by Dr. Imre Bartfai

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Hi,

a quick-and-dirty answer: try to put SERIALLY a 3,1 V Zener or 4-5 pcs. of
1Nxxxx diodes. (I can not guarantee it works or not harms the PIC...)

Imre


On Mon, 22 Jun 1998, Georg Hager wrote:

{Quote hidden}

1998\06\23@031431 by Hans Blichfeldt

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At 01:05 PM 22/06/1998 +0200, you wrote:
>Hi all!
>
>Does anyoune know of a voltage regulator that does not swallow a couple of
>mA even with no load?
-snip
>
>Any help would be appreciated.
>Georg.
>
Telcom TC55 works OK, uses 2-4 uA and costs below $1.-.  Intersil ICL 7663S
is probably better, uses < 10uA + the loose, approx 15-20 uA totally, needs
smaller capacitors but is more expensive.-

Best regards,
Hans

1998\06\23@220637 by M Walter

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>>
>> Try the LM2936Z-5.0  It's a TO-92 - same pin-out as the L05 but only sips
>> about  15uA quiescent current -
>
>Sean
>
Be carefull of the quiescent current at start-up. I had one device, with
low quiescent current which gave us fits. We were using an ultra-low power
line operated supply, and when the line voltage is applied the filter cap
starts at zero and quick ramps up to about 16 V no load. When the cap
reached the point where the regulator starts to turn on, it would hang up.
Seems that if the regulator input voltage is just around the rated output
voltage, device tries _really_ hard to control the output. Since there is
not enough input voltage to quite overcome the drop-out voltage, the pass
transistor is driven hard. It takes a lot of current, and the quiescent
current rises. In our design the increase quiescent current loaded down the
the input so much that it never allowed the input to rise high enough to
operate.

1998\06\23@220637 by M Walter

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>>
>> Try the LM2936Z-5.0  It's a TO-92 - same pin-out as the L05 but only sips
>> about  15uA quiescent current -
>
>Sean
>
Be carefull of the quiescent current at start-up. I had one device, with
low quiescent current which gave us fits. We were using an ultra-low power
line operated supply, and when the line voltage is applied the filter cap
starts at zero and quick ramps up to about 16 V no load. When the cap
reached the point where the regulator starts to turn on, it would hang up.
Seems that if the regulator input voltage is just around the rated output
voltage, device tries _really_ hard to control the output. Since there is
not enough input voltage to quite overcome the drop-out voltage, the pass
transistor is driven hard. It takes a lot of current, and the quiescent
current rises. In our design the increase quiescent current loaded down the
the input so much that it never allowed the input to rise high enough to
operate.

1998\06\24@034805 by org Hager

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On Tue, 23 Jun 1998, Dr. Imre Bartfai wrote:

> Hi,
>
> a quick-and-dirty answer: try to put SERIALLY a 3,1 V Zener or 4-5 pcs. of
> 1Nxxxx diodes. (I can not guarantee it works or not harms the PIC...)
>
> Imre
>

I don't think this would work. AFAIK, zeners need some minimum current to
reach their specified voltage drop. This current is way above the supply
current of a sleeping PIC.

Georg.

>
> On Mon, 22 Jun 1998, Georg Hager wrote:
>
> > Hi all!
> >
> > Does anyoune know of a voltage regulator that does not swallow a couple of
> > mA even with no load?
> ...

1998\06\24@132738 by Claudio Rachiele IW0DZG

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                  Status Distribution June 23, 1998 15:31:16

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