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TPS56837H: What is the main difference between TPS56837H to TPS56837 ? Is there an efficiency difference ?

Part Number: TPS56837H
Other Parts Discussed in Thread: TPS56837


As a part of a power charging board I'm designing now I need to use the TPS56837H for converting 24v to 15v. . 

Till now I considered working with TPS56837H  since its data-sheet introduce a good efficiency (about 97.7% for 3A output)for the exact voltages I need : Vin:24v/19v , Vout:15v.  

However, when I asked to catalogue it I was noticed by our catalogue team that TPS56837 is already existed in our library. I admit I saw their a little bit lower efficiency (97.4%) but for Vout=12v and not 15v. 

What I want to ask is what is the main difference between them and if the efficiency supposed to be a part of the difference.  

Thanks and BR,