Are you talking about a linear voltage regulator that will dissipate 25
Watts???  You should go for a switching step down regulator... lots of
space and power savings. Just the 25W heat sink would cost more than the
switching parts.

The LM2936 can ouputs a max of 50mA, 40V max input, it means at the
limit it will dissipate less than 2Watts.

Jameel Ahed wrote:
>
> Has anyone found a 5V Voltage regulator with an output of approximately 1A..
> that can handle a 30+ Volt input?
> Jameel
>
> ----- Original Message -----
> From: Jim Hartmann <Jim_Hartmann@SILENTKNIGHT.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Thursday, February 10, 2000 8:26 AM
> Subject: Re: low-loss voltage reg [OT?]
>
> > Another chip that looks nice is the National LM2936: LDO, 5V out, 40V max
> > in, 15ua quiescent @ 100uA out.
> >