Re: Step-down switching regulator advice ?



mpm wrote:

Eeyore wrote

I need a popular (easily available), low cost step-down switching regulator
suitable for an input voltage of up to ~ 18V that will deliver ~ 1A @11V with
Vin ideally as low as 11.25V.

What would you recommend ? I'm not at all familiar with the offerings here.

LM2575's switchers are pretty popular.
Second sourced by ON Semi, and possibly others.

OK, got the data.


Not sure about the 0.25V drop though.
And you'd need the adjustable one - requires 2 external programming
resistors.

An adjustable one is just fine.

The low voltage drop is important to me. I suppose an alternative might be a
buck-boost circuit. This would actually be even better suited to my needs. In which
case my spec would be 1A @ 12.6V output with 11-18V in.

Graham


.

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