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Questions about LTM4656 + LTC6909

		
		

		

			

									
						Se-woong
					
							

			
				
									
											
			        
                                                			
				
			
		


				
		

		    
		    
		    		    
			
Hello,




My customer wants to divide their Boost device and use multiple devices instead of one boost converter because of heating issue.


Please refer below conditions & design and let me know your opinions.




1. 12V Vin / 36V Vout/ 9A Iout   


    1) Customer's concept


        Use 1 LTC6909 for controling poliphase (30 degree)


        Use 6 LTM4656 with current sharing






 




LTM4656.asc






Would you suggest your opinions above design concept?


Please advise me.




Regards,


Se-woong





								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	










	

	

					



			








	
	
	
	



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    Hi Se-wong,
    

    Sorry for delay. More than 2-phases may be a problem. The modules use COMP pin to provide current sharing. One of the COMP pins becomes MASTER while other pin is just loading the MASTER COMP pin. With more modules, the COMP pin may get overloaded. We do not recommend going over 2 or just maximum of 3-phases.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

    

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													+1
							
			
				
									
							
						
				
			
					
    
	
    

		
		
    
					
    Hi Se-wong,
    

    Sorry for delay. More than 2-phases may be a problem. The modules use COMP pin to provide current sharing. One of the COMP pins becomes MASTER while other pin is just loading the MASTER COMP pin. With more modules, the COMP pin may get overloaded. We do not recommend going over 2 or just maximum of 3-phases.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

    

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