LM25145: is LM25145 stackable?

Fred Cheng

Expert 5890 points

Part Number: LM25145
Other Parts Discussed in Thread: LM25148, LM5145, LM5148, LM5149

hi team,

is LM25145 stackable ?

if yes,

please provide reference schematic, I can't find in the datasheet

over 3 years ago

0 Timothy Hegarty over 3 years ago

TI__Guru* 75742 points

Hi Fred,

There is a technical article in the product folder. However, it's easier to do with current-mode control. Take a look at the LM25148 instead.

Regards,

Tim

0 Fred Cheng over 3 years ago in reply to Timothy Hegarty

TI__Expert 5890 points

Hi Timothy,

where is the product folder you refer to ?

my customer has fixed solution to LM25145 , so I don' think LM25148 reference can help

would you directly send schematic to me or show it to me?

0 Timothy Hegarty over 3 years ago in reply to Fred Cheng

TI__Guru* 75742 points

Here is the product folder: https://www.ti.com/product/LM25145

The technical article I was referring to is: https://e2e.ti.com/blogs_/b/powerhouse/posts/how-to-design-a-simple-two-phase-current-sharing-synchronous-buck-regulator-using-a-voltage-mode-controller

However, as mentioned, it's much easier to use a current-mode controller (by connecting the COMP pins) - no external components required - and the current sharing performance in steady state and transiently will be much better. The LM25148 is specifically designed for 2-phase stackability, so we encourage use of that solution.

Regards,

Tim

0 Fred Cheng over 3 years ago in reply to Timothy Hegarty

TI__Expert 5890 points

Hi TImothy,

so basically you mean LM25145 need two exact same compensation network, while LM25148 only need one is enough, right?

well, in my case. my customer can accept two identical compensation network since LM25145 is cheaper.

0 Timothy Hegarty over 2 years ago in reply to Fred Cheng

TI__Guru* 75742 points

Fred, note you need an external circuit with the LM5145 (shunt resistors, amplifier, etc.), so the LM25148 overall is lower cost.

Tim

0 Fred Cheng over 2 years ago in reply to Timothy Hegarty

TI__Expert 5890 points

Hi Timothy,

I understand but they need to use LM5145 and LM25145 co-lay for low Vin and high Vin products, since at this moment we don't have LM5149 or LM5148 samples.

BTW, I'm still looking for your confirmation on the above two exact same compensation network ?

+1 Timothy Hegarty over 2 years ago in reply to Fred Cheng

TI__Guru* 75742 points

Yes, same compensation values for the 2 phases.

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LM25145: is LM25145 stackable?