Re: seek automobile 5.5V power

On Jun 6, 7:57?pm, "2007 May" <NoS...@xxxxxxxxxxx> wrote:
"martin" <mart_in_medina@xxxxxxxxxx> wrote in message

5.5v at what current?

around 800mA.

The National Semiconductor LM2575T-ADJ will handle that.
They make a high-voltage input variety, but even the normal one
handles 40-volts in, or something like that. 1.5A out. It's a
switcher, so you'll need a Shottkey diode, an inductor, and input &
output caps. Switching frequency is 52kHz, so parts size /
availability / cost / real estate are all within reason.

For protection, you could design circuits ahead of this (don't forget
the fuse too).
Also, the LM2575T has a shutdown pin if that helps?
And because it's a switcher, it'll produce less heat compared to a
linear regulator, and you might not need a heat sink.

ON Semiconductor 2nd sources the LM2575T-ADJ, so look there too.

Note: Take this for what's its worth. There may be better options
out there for you...
-mpm

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