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LTM4653 - optimal thermal PCB layout and thermal theda values



		

			

									
					    enphos
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 6, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    

    1) What is the optimal thermal PCB layout? Does the evaluation board DC2327A represent the optimal thermal PCB layout?
    

    2) The datasheet has several thermal theda values: theda_JCtop = 20.6, theda_JCbottom = 5.1, theda_JB = 6.0, theda_JA = 15.5. Which would I use for analysis of the BGA packaged soldered to the board without a heatsink? I am particularly confused about the difference between theda_JCBottom and theda_JB. I want to take advantage of the theda_JCbottom thermal resistance, but I am unsure what PCB layout and assembly configuration resulted in theda_JCbottom.
    

    Thank you!