Maker Pro
Maker Pro

Boost Switcher

G

Graeme Dennes

Jan 1, 1970
0
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
 
J

John Crighton

Jan 1, 1970
0
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
 
K

Ken Taylor

Jan 1, 1970
0
John Crighton said:
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
 
J

John Crighton

Jan 1, 1970
0
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
 
K

Ken Taylor

Jan 1, 1970
0
John Crighton said:
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

Nice find! Farnell have them for about $13 each (...CPA form - not sure what
that is off-hand).

Cheers.

Ken
 
B

budgie

Jan 1, 1970
0
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.
 
G

Graeme Dennes

Jan 1, 1970
0
Thank you Budgie.

Graeme

budgie said:
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.
 
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