Some of the LT switchers allow you to use external FETs as
synchronous switches.
Leads to high efficiencies and keeps dissipation off the IC.




Russell McMahon



From: Tjaart van der Walt <tjaart@WASP.CO.ZA>

Mark Walsh wrote:
> The only gotcha's with the LT parts are using good coils and
Schottky
> diodes.  Otherwise, they are pretty straightforward.
>
> Mark Walsh

Another is that the schottky's have to be rated @
at least 3X max current (as per spec sheet). 15A
schottky's are not cheap, and come in TO220 only.

BTW, New Japan Radio makes a switcher in a SO8
package with a 1.5A switch built-in. The price
is around US$0.60. Try to buy a Linear part for
that price...
Friendly Regards          /"\
Tjaart van der Walt        X  ASCII RIBBON CAMPAIGN