Lpc2000

I have used that Maxim chip for another purpose (it is pretty low
noise), but good luck getting small quantities of it and forget Digi-Key
or Newark.  Fortunately, there are other manufacturers that have similar
parts.

Matt

________________________________

From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf
Of Leon Heller
Sent: Wednesday, April 26, 2006 11:29 AM
To: lpc2000@yahoogroups.com
Subject: Re: [lpc2000] 2103 forces dual supply?

 

----- Original Message ----- 
From: "Xtian Xultz" <xultz@...>
To: <lpc2000@yahoogroups.com>
Sent: Wednesday, April 26, 2006 3:45 PM
Subject: Re: [lpc2000] 2103 forces dual supply?


> Em Ter 25 Abr 2006 20:55, Robert Adsett escreveu:
>> At 08:04 PM 4/25/2006 -0300, Xtian Xultz wrote:
>> >  Its too dangerous to generate 1.8V (more or less) from the 3.3V
with 
>> > two
>> >diodes in series?
>> >Someone tryed this?
>>
>> Just put in an LDO.  You can get them as small as a sot23 giving you 
>> about
>> 90mA with a 30C rise dropping down from the 3V3 supply.
>>
>> Robert
>
> Thats what I am using, LM317 with SOT23 footprint. What makes me sad
is 
> that
> both regulators (one for 3,3 and one for 1,8V) plus the resistors
ocuppies
> more space on the board than the LPC itself. So, LPC is a really small
> microcontroller (looking for a ARM based wich has only 48 pins, the
> concorrents are 100 or 144 pins, the smallers!) and with a very small
> footprint (soldering 20 mils pins with soldering iron its not easy, I
am
> doing, but its not funny. Its interesting that a 25 mils chip is much
more
> easy to solder and to design the board) but the power circuit is
bigger...

There is a tiny little Maxim dual regulator (MAX8882) in SOT23-6 giving
1.8 
V and 3.3 V. They used only to be available by the reel, but one can buy

small quantities, now.

Leon
--
Leon Heller, G1HSM
leon.heller@...
http://www.geocities.com/leon_heller 

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