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Which Boost/buck converter? LTC3780 vs LM2577S LM2596S Answered

Hi, brought two boost buck converters to build a bench power supply from a atx psu.  Brought the LM version first as i have read previously that these are quite efficient, then seen the LTC one, so thought i might as well buy that as well. 
Looks like the LTC board will be able to go down to lower voltages and appears to have a greater efficiency, quoted up too 98%, compared with the LM's at around 80%. Thou i understand that with adjustments changes efficncey. 
LM2577S LM2596S
http://www.ebay.co.uk/itm/281777880409?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

LTC3780
http://www.ebay.co.uk/itm/332009159315?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Which one do you think i should use?

Regards

Discussions

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Downunder35m

1 year ago

I don't think as I don't have the information required to tell you which one is better suited for your needs.

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JonathanM221Downunder35m

Reply 1 year ago

Cheers, i've decided to look the chips up online and compare, once i've got my head around it, a little rusty on the subject.

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Downunder35mJonathanM221

Reply 1 year ago

I mean they both do what they should, so IMHO it all depends on your usage and needs.
Since you use an ATX an no batteries I guess it does not really matter much either way.

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JonathanM221Downunder35m

Reply 1 year ago

Yeah was just looking to see which one had the better amp and volt handling and efficieny.

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Downunder35mJonathanM221

Reply 1 year ago

That's where the datasheets come into place.
Also keep in mind that the best efficiency is not always throughout the entire range of regulation.

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JonathanM221Downunder35m

Reply 1 year ago

Yeah i did note that in my original post, i think the more it has to transfer volts to amps and vice versa the less ideal!