>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]=20
>Sent: 08 December 2005 09:07
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE] (Fwd) [Keelynet] DIY supercapacitor as a=20
>9VDC battery &more
>
>
>>> Take at look at the micropower switcher design in the Art Of
>>> Electronics
>> for a fairly discrete solution.  Micropower switcher IC's are made
>> by most
>> of the larger semiconductor manufacturers such as Maxim, Linear=20
>> Technology
>> etc. e.g. an LT1615-1 works down to 1 volt, and consumes just 20uA=20
>> when
>> operating.  It also comes in a tiny package which means you could=20
>> maybe even
>> pack two supercaps into your PP3 housing.
>>
>> Could anyone please post this circuit somewhere? I live in Costa
>> Rica and
>> it=B4s VERY hard for me to get some of this books...
>
>
>Google is (how come "EVERYONE" doesn't know this yet?) your friend.
>Copyright violating copies of TAOE may not be available (and may) but=20
>app notes for LT products surely are.
>
>eg
>
>Google hit #3
>       =20
>http://www.linear.com/pc/productDetail.do?navId=3DH0,C1,C1003,C10
42,C1035,P1774

>#2    http://www.zetex.com/3.0/a1-7.asp

>Datasheet with applications data galore (rebuild URL :-( ).

>    http://linear-tech.com.cn/pc/downloadDocument.do;jsessionid=3DC4O6H5=
M2PTvOEEzzcDlXHmPb0LmR3fjRadKVgi1qs3JfOrUZzQbo!-848388738?navId=3DH0,C1,C=
1003,C1042,C1035,P1774,D3577

>LT1615 is tiny - and stupidly expensive. $US1.80 in 5000 quantity.

>For a cheap and cheerful low cost solution with less efficiency, less=20
>cost and immense flexibility ask Google about MC34063

Russell,

The reason I picked the LT1615 from the numerous devices available was pr=
imarily it's ultra low quiescent current, and it's ability to work down t=
o 1 volt.  Being tiny is a positive advantage for this application.

The MC34063 needs 3 volts minimum, and the datasheet lists an operating c=
urrent of 4mA @5v.  The supercap has a maximum working voltage of 2.3volt=
s which makes the Motorla a non-starter for this application.

Regards

Mike

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