Recommend a switching regulator?

[Mark Haase]

Hey all--

I have a 12V SLA battery that I am using to power a microcontroller. Can
anybody recommend a good switching regulator that would provide peak
current of maybe 200ma, and average current of 75-100.

I tried looking at digikey, but I don't know much about regulators and I
couldn't really be sure that I was ordering the right part.

Also, what kind of support components does a switching regulator need?
I'm ignorant of how a regulator works, but "switching" to me makes it
sound like maybe it needs a few caps to smooth the output current..true?

Thanks,
Mark

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mehaase(at)sas(dot)upenn(dot)edu

 

[R Adsett]

In article <mehaase-33F1CA.07394019082004@netnews.upenn.edu>,
mehaase@earthlink.net says...

Hey all--

I have a 12V SLA battery that I am using to power a microcontroller. Can
anybody recommend a good switching regulator that would provide peak
current of maybe 200ma, and average current of 75-100.

I tried looking at digikey, but I don't know much about regulators and I
couldn't really be sure that I was ordering the right part.

Also, what kind of support components does a switching regulator need?
I'm ignorant of how a regulator works, but "switching" to me makes it
sound like maybe it needs a few caps to smooth the output current..true?
Take a look at Nationals Simple Switchers. They have a web based design

utility (Webbench, you put in the desired input/output and it gives you a
circuit with part values) that gives a good starting point for someone
unfamiliar with switching supplies. Read the layout notes in the
datasheets.

Switchers can use caps but I've not seen a switching regulator with a
voltage much above 5V nominal that uses caps (that's regulator as opposed
to inverter or doubler). Most switching regulators use inductors in the
switching path.

Robert