DC-DC step-up converters... how do they work?
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DC-DC step-up converters... how do they work?

 
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Dan Lenski
Guest
Posted: Wed Dec 07, 2005 7:52 am    Post subject: DC-DC step-up converters... how do they work? Reply with quote
Hi,
I recently heard about DC-DC step-up converters, like this one from Maxim:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1207

It seems like a cool idea: you can power a 3.3V or 5V device off a single
1.5V cell. I am wondering how they work. I see that all of the ones
that can operate off <1.5V input include inductors. (There are also
capacitor charge pumps that can double a voltage, but none of those can
operate off a single 1.5V cell).

Can anyone give me an explanation of how these inductive charge pumps work?

Thanks,
Dan

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PeteS
Guest
Posted: Wed Dec 07, 2005 5:35 pm    Post subject: Re: DC-DC step-up converters... how do they work? Reply with quote
Read this app note
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1142,C1114,P1134,D4162

(AN73 from linear tech at http://www.linear.com/)

It has a really great description of boost and buck converters.

Cheers

PeteS
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neon



Joined: 25 Feb 2006
Posts: 570
Posted: Wed Mar 08, 2006 1:10 pm    Post subject: Reply with quote
reading those data sheets will get answer to your question. converters comes not only 1v to whatever but they come whatever to 1v. the answer is switching and control. need more read more.

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the_laughing_man



Joined: 21 Apr 2006
Posts: 6
Posted: Fri Apr 21, 2006 2:39 am    Post subject: Re: DC-DC step-up converters... how do they work? Reply with quote
PeteS wrote:
Read this app note
http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1142,C1114,P1134,D4162

(AN73 from linear tech at http://www.linear.com/)

It has a really great description of boost and buck converters.

Cheers

PeteS


very nice design. If i have time this summer ill analyze all of it.
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tomyg



Joined: 25 Jul 2006
Posts: 1
Posted: Tue Jul 25, 2006 12:09 am    Post subject: Stepup Reply with quote
a boost converter (step up dc/dc) is a power converter with an output dc voltage greater than its input dc voltage. "wikipedia.org"

here check these guys out. their stuff has a lot of white sheets. i go there for reference sometimes. www.semiconductorstore.com/Pages/Products/ault.htm
or www.aultinc.com has many whitesheets to this type of product.

also if you ever need reference. wikipedia.org. that linear tech sheet is pretty good as well.

Good question.
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