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Graeme Dennes

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I've been searching unsuccessfully for references or application notes for a
simple switching boost regulator circuit to boost 2 cells (3V, down to 2V)
to a regulated output of 8 to 9 volts DC, at a load current of 10 mA.

Any references appreciated.

TIA. Graeme Dennes
 
On Sat, 20 Dec 2003 00:36:24 +1100, "Graeme Dennes"
<gdennes@ihug.com.au> wrote:

I've been searching unsuccessfully for references or application notes for a
simple switching boost regulator circuit to boost 2 cells (3V, down to 2V)
to a regulated output of 8 to 9 volts DC, at a load current of 10 mA.

Any references appreciated.

TIA. Graeme Dennes
Click to expand...
Hello Graeme,
as a hobbyist, I am interested in similar little power supplies
to you. Some time ago, I downloaded switchercad 3 from here
http://www.linear.com/software/

Today, just for fun I ran the program with your requirements
and it came up with a few solutions.

Now don't get too excited as I did a while ago because
the switching ICs are hard to find here in Sydney. RS had
some and were expensive. I e-mailed LT asking who were
their agents in Australia for parts but they didn't bother
answering. Oh well that's a pity.
Anyway, I think the program is worth downloading just
to have a little play with it.

If you visit the National website
http://www.national.com/appinfo/webench/scripts/my_webench.cgi/
and have a play with their web bench tool you will probably
have a better chance at finding parts. You might even be lucky
and score a few free sample parts for you to evaluate. :)

Regards,
John Crighton
Hornsby
 
"John Crighton" <john_c@tpg.com.au> wrote in message
news:3fe34912.2031435@News.CIS.DFN.DE...
On Sat, 20 Dec 2003 00:36:24 +1100, "Graeme Dennes"
gdennes@ihug.com.au> wrote:

I've been searching unsuccessfully for references or application notes
for a
simple switching boost regulator circuit to boost 2 cells (3V, down to
2V)
to a regulated output of 8 to 9 volts DC, at a load current of 10 mA.

Any references appreciated.

TIA. Graeme Dennes



Hello Graeme,
as a hobbyist, I am interested in similar little power supplies
to you. Some time ago, I downloaded switchercad 3 from here
http://www.linear.com/software/

Today, just for fun I ran the program with your requirements
and it came up with a few solutions.

Now don't get too excited as I did a while ago because
the switching ICs are hard to find here in Sydney. RS had
some and were expensive. I e-mailed LT asking who were
their agents in Australia for parts but they didn't bother
answering. Oh well that's a pity.
Anyway, I think the program is worth downloading just
to have a little play with it.

If you visit the National website
http://www.national.com/appinfo/webench/scripts/my_webench.cgi/
and have a play with their web bench tool you will probably
have a better chance at finding parts. You might even be lucky
and score a few free sample parts for you to evaluate. :)

Regards,
John Crighton
Hornsby

Maxim may also be of interest.
Click to expand...
http://para.maxim-ic.com/ss.asp?Fam=DCDC_All&Tree=PowerSupplies&HP=PowerSupplies.cfm&ln=

Cheers.

Ken
 
On Sat, 20 Dec 2003 11:27:34 +1300, "Ken Taylor" <ken@home.nz> wrote:

"John Crighton" <john_c@tpg.com.au> wrote in message
news:3fe34912.2031435@News.CIS.DFN.DE...
On Sat, 20 Dec 2003 00:36:24 +1100, "Graeme Dennes"
gdennes@ihug.com.au> wrote:

I've been searching unsuccessfully for references or application notes
for a
simple switching boost regulator circuit to boost 2 cells (3V, down to
2V)
to a regulated output of 8 to 9 volts DC, at a load current of 10 mA.

Any references appreciated.

TIA. Graeme Dennes



Hello Graeme,
as a hobbyist, I am interested in similar little power supplies
to you. Some time ago, I downloaded switchercad 3 from here
http://www.linear.com/software/

Today, just for fun I ran the program with your requirements
and it came up with a few solutions.

Now don't get too excited as I did a while ago because
the switching ICs are hard to find here in Sydney. RS had
some and were expensive. I e-mailed LT asking who were
their agents in Australia for parts but they didn't bother
answering. Oh well that's a pity.
Anyway, I think the program is worth downloading just
to have a little play with it.

If you visit the National website
http://www.national.com/appinfo/webench/scripts/my_webench.cgi/
and have a play with their web bench tool you will probably
have a better chance at finding parts. You might even be lucky
and score a few free sample parts for you to evaluate. :)

Regards,
John Crighton
Hornsby

Maxim may also be of interest.
http://para.maxim-ic.com/ss.asp?Fam=DCDC_All&Tree=PowerSupplies&HP=PowerSupplies.cfm&ln=

Cheers.

Ken


Hello Ken,
Click to expand...
yes, that was interesting!
I had a play answering all the questions and this is what came out.
http://www.maxim-ic.com/appnotes.cfm/appnote_number/227
They do free samples also!
Now that I have had my fun, I will leave it to Graeme to do the
leg work and to tell us where you get the MAX761 here in Australia
and the price.
Regards,
John Crighton
Hornsby
 
"John Crighton" <john_c@tpg.com.au> wrote in message
news:3fe3a024.5548689@News.CIS.DFN.DE...
On Sat, 20 Dec 2003 11:27:34 +1300, "Ken Taylor" <ken@home.nz> wrote:

"John Crighton" <john_c@tpg.com.au> wrote in message
news:3fe34912.2031435@News.CIS.DFN.DE...
On Sat, 20 Dec 2003 00:36:24 +1100, "Graeme Dennes"
gdennes@ihug.com.au> wrote:

I've been searching unsuccessfully for references or application notes
for a
simple switching boost regulator circuit to boost 2 cells (3V, down to
2V)
to a regulated output of 8 to 9 volts DC, at a load current of 10 mA.

Any references appreciated.

TIA. Graeme Dennes



Hello Graeme,
as a hobbyist, I am interested in similar little power supplies
to you. Some time ago, I downloaded switchercad 3 from here
http://www.linear.com/software/

Today, just for fun I ran the program with your requirements
and it came up with a few solutions.

Now don't get too excited as I did a while ago because
the switching ICs are hard to find here in Sydney. RS had
some and were expensive. I e-mailed LT asking who were
their agents in Australia for parts but they didn't bother
answering. Oh well that's a pity.
Anyway, I think the program is worth downloading just
to have a little play with it.

If you visit the National website
http://www.national.com/appinfo/webench/scripts/my_webench.cgi/
and have a play with their web bench tool you will probably
have a better chance at finding parts. You might even be lucky
and score a few free sample parts for you to evaluate. :)

Regards,
John Crighton
Hornsby

Maxim may also be of interest.

http://para.maxim-ic.com/ss.asp?Fam=DCDC_All&Tree=PowerSupplies&HP=PowerSup
plies.cfm&ln=

Cheers.

Ken


Hello Ken,
yes, that was interesting!
I had a play answering all the questions and this is what came out.
http://www.maxim-ic.com/appnotes.cfm/appnote_number/227
They do free samples also!
Now that I have had my fun, I will leave it to Graeme to do the
leg work and to tell us where you get the MAX761 here in Australia
and the price.
Regards,
John Crighton
Hornsby
Click to expand...
Nice find! Farnell have them for about $13 each (...CPA form - not sure what
that is off-hand).

Cheers.

Ken
 
On Sat, 20 Dec 2003 00:36:24 +1100, "Graeme Dennes"
<gdennes@ihug.com.au> wrote:

I've been searching unsuccessfully for references or application notes for a
simple switching boost regulator circuit to boost 2 cells (3V, down to 2V)
to a regulated output of 8 to 9 volts DC, at a load current of 10 mA.

Any references appreciated.
Click to expand...
Graeme, I'd take a serious look at the sometimes maligned MC34063
and/or its many clones. I've used it to step up +12V to +28V @ 100mA
output, and it was a snap. First design came out spot on, and VERY
low noise all the way from no load (well, there was 5mA into a LED) up
to 100mA.

If you have the time to wait for samples, then maybe the Maxim chip
quoted elsewhere. AFAIK the aus agents for both LT and Maxim are
(shudder) Arrow.

The NatSemi "simple switchers" are good but more expensive that the
34063 and overkill for your 10mA load.
 
Thank you Budgie.

Graeme

"budgie" <me@privacy.net> wrote in message
news:3fe6f2fb.11975159@news.individual.net...
On Sat, 20 Dec 2003 00:36:24 +1100, "Graeme Dennes"
gdennes@ihug.com.au> wrote:

I've been searching unsuccessfully for references or application notes
for a
simple switching boost regulator circuit to boost 2 cells (3V, down to
2V)
to a regulated output of 8 to 9 volts DC, at a load current of 10 mA.

Any references appreciated.

Graeme, I'd take a serious look at the sometimes maligned MC34063
and/or its many clones. I've used it to step up +12V to +28V @ 100mA
output, and it was a snap. First design came out spot on, and VERY
low noise all the way from no load (well, there was 5mA into a LED) up
to 100mA.

If you have the time to wait for samples, then maybe the Maxim chip
quoted elsewhere. AFAIK the aus agents for both LT and Maxim are
(shudder) Arrow.

The NatSemi "simple switchers" are good but more expensive that the
34063 and overkill for your 10mA load.
Click to expand...
 
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