What about National's HV versions of simple switcher.  LM2594HV is 5V,
SOIC 8pin, max Vin 60V.

On Fri, 14 May 1999, Andy Kunz wrote:

> Anybody know of a SMT regulator which can handle 45V input, 5V/50mA output?
>  40V * 50mA = 2W - an awful lot for a tiny PCB to handle.
>
> I'm finding very few options in the datasheets.
>
> PCB size is a premium. Reliability is SUPER important, component
> cost/complexity is secondary.
>
> Ideas?
>
> Thanks!
>
> Andy
>
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