TPS650250 efficiency of LDO's

Perry Frogge

Other Parts Discussed in Thread: TPS650250

I can't find anywhere, the efficiency of the LDO converters. My board design is sensitive to even 1mA of wasted current. I have implemented the circuit given below, not using TPS650250 LDO's because I cannot quantify their efficiency. I could save BOM, board space etc. if I knew the LDO's of the 650250 would be close to the 60% I get with the TPS73101.

I have all 3 of the switching regulators in use, so i cannot use one of them.

thanks

I have implemented a TPS73101 with 1.8V in and 1.2V out, at 10mA max, Webbench says it is 60% efficient at 8mA. So my

over 12 years ago

0 Michael Green over 12 years ago

TI__Genius 16870 points

Perry,

We do not spec the efficiency for the LDOs at 10mA. I can look for some data to support a good hypothesis but, if you order an EVM from our store that will probably be the fastest and most satisfying answer for you. You can order here: http://www.ti.com/tool/tps650250evm-447#buy

An efficiency test is pretty simple and quick. You can follow this blog for any additional help: http://e2e.ti.com/blogs_/b/powerhouse/archive/2013/04/08/draft-blog-from-bob-hanrahan.aspx

-Bob made a really nice video showing the test procedure at the bottom. Efficiency

0 Perry Frogge over 12 years ago in reply to Michael Green

Intellectual 370 points

Thanks for feedback, should I decide to use an LDO of the 650250, what should I do with the unused LDO's feedback pin? leave it float? tie it to a duplicate divider network as first LDO?

0 Perry Frogge over 12 years ago in reply to Perry Frogge

Intellectual 370 points

TRying to bring this to attention so question about unused LDO is answered, thanks.

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TPS650250 efficiency of LDO's