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'[EE] MC34063 low cost 2A replacement?'
2009\05\24@231955 by Enki

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  Hi,

  I need to replace a MC34063 1A switching regulator for a 2A one.
  Is there any low-cost 2A replacement?
  Of course the board layout will need adjustments.

  Thanks for any suggestion.
  Mark Jordan


2009\05\25@021255 by Jinx

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>   I need to replace a MC34063 1A switching regulator for a 2A one

What topology ?

2009\05\25@024351 by Xiaofan Chen

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On Mon, May 25, 2009 at 11:19 AM, Enki <spam_OUTenkitecTakeThisOuTspamgmail.com> wrote:
>   Hi,
>
>   I need to replace a MC34063 1A switching regulator for a 2A one.
>   Is there any low-cost 2A replacement?
>   Of course the board layout will need adjustments.
>

There are many parts to MC34063. Some of them are
really low cost.
Eg: NCP3063 at US$0.32, better and cheaper than the original.
www.onsemi.com/PowerSolutions/product.do?id=NCP3063PG
http://www.onsemi.com/PowerSolutions/product.do?id=MC33063A

It is very difficult to beat MC34063 (or similar) in price. So you
can still use it and just add an external PNP transistor to
boost the output current.

You can get some examples here.
http://www.onsemi.com/pub_link/Collateral/AN920-D.PDF


--
Xiaofan http://mcuee.blogspot.com

2009\05\25@060234 by Jinx

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> It is very difficult to beat MC34063 (or similar) in price. So you
> can still use it and just add an external PNP transistor to boost the
> output current

The 3063 datasheet shows examples using FETs, which are not used
in the 34063 datasheet

http://www.onsemi.com/pub/Collateral/NCP3063-D.PDF

The increase from 50kHz (34063) to up to 250kHz (3063) means
cost savings on the inductor too

I use the 34063 in various configurations and would change to the
3063 in circuit revisions

2009\05\25@082434 by M.L.

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face
On Mon, May 25, 2009 at 6:01 AM, Jinx <.....joecolquittKILLspamspam@spam@clear.net.nz> wrote:

> > It is very difficult to beat MC34063 (or similar) in price. So you
> > can still use it and just add an external PNP transistor to boost the
> > output current
>
> The 3063 datasheet shows examples using FETs, which are not used
> in the 34063 datasheet
>
> http://www.onsemi.com/pub/Collateral/NCP3063-D.PDF
>
> The increase from 50kHz (34063) to up to 250kHz (3063) means
> cost savings on the inductor too
>
> I use the 34063 in various configurations and would change to the
> 3063 in circuit revisions
>

It looks like a nice part. It is significantly more expensive than the 23
cent MC34063 at 40 cents though. Like you said, it depends on if you can
save the money on the inductor and filter cap.

-
Martin

2009\05\25@090742 by Enki

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Jinx wrote:
>>   I need to replace a MC34063 1A switching regulator for a 2A one
>>    
>
> What topology ?
>  

   8-30 input, 2-5V output @ 2A

2009\05\25@175635 by Jinx

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>    8-30 input, 2-5V output @ 2A

If it's a basic step-down then there are many possibilities. Several
manufacturers do 3A and 5A variable switchers. I use the NatSemi
LM25xx range occassionally, and Linear Technology ICs appear on
all sorts of boards

I think by switching to the 3063, the (probably) reduced cost of the
inductor and cap - which would be a fraction of their values needed
for the 50kHz chip - would pay for a bypass transistor. You might
even come out ahead a little on board space with smaller parts

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