[Diy_efi] switch mode replacement for to-220 7805?

[Richard M]

200-250mA shouldn't cause much problem for a conventional linear reg... if
low dropout voltage is an issue, try National LM2940 series - will work down
to a few hundred millivolts input/output differential at 1A. It is also
rated for the automotive environment, so is pretty indestructible.
Cheers
Rich

----- Original Message -----
From: "Brian Dessent" <brian at dessent.net>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, August 14, 2002 9:51 PM
Subject: Re: [Diy_efi] switch mode replacement for to-220 7805?


> Chris Conlon wrote:
>
> > Has anyone seen a switching regulator which is a suitable
> > drop-in replacement for a TO-220 package 7805? Power Trends
>
> Hmmm.  It's going to be hard to find a monolithic solution, a buck
> converter is all but impossible without an inductor and diode.  I
> suppose the diode is eay enough to integrate, but not the inductor.  If
> you can accept something with these two external parts (in addition to
> the normal input and output filter capacitors) then look at National's
> LM2575 (a 5 lead TO220) or Analog's ADP1110 (an 8 pin DIP.)
>
> What's the context?  Why do you need a switcher for such a low current
> level?  Is it because you need the efficiency, or because the input is
> very close to 5V?
>
> Brian



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