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LTC7871 Recommended for New Designs
The LTC7871 is a high performance bidirectional buck or boost switching regulator controller that operates in either buck or boost mode on demand. It regulates...
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LTC7871 on Analog.com

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one phase LTC7871

		
	
				

			

									
					    ICCsrl
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 4, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LTC7871  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hi everyone, I only need to use one phase of the LTC7871 during calibration.
    

    Can I tie the SNSA+, SNSD+ & SNS- pins together  and connect the combined traces to VLOW with a low-RON analog switch (eg ADG5433)?
    

    Many thanks in advance
    

    I.C.
    
			
    
			
									
		                             
                        

    
    
                                            
                 power management
                
                                                    
                 hardware
                
                                                    
                 High Input Voltage Buck Regulators
                
                                                    
                 LTC7871
                
                                                    
                 Step-Down (Buck) Regulators
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Aug 4, 2025 11:21 PM
            
            
						
			            		
      
		
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      Hello I.C.,
      

      The LTC7871 can be used with just one phase. But, could you give me more details on your circuit. For instance, do you intend to use all 6 phases during normal operation and use just one in calibration? Why are you using an analog switch? 
      

      If you wish to temporarily disable a phase and the LTC7060 is being used, then a phase can be disabled by tying the EN pin of the respective LTC7060 to GND.
      

      Best regards,
      

      Mike
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
				
				
				
		
		
      
			
		
      
	
      

      

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                on Aug 5, 2025 3:18 AM
            
            
												
						in reply to mike.shriver
					
										
			            		
        
		
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        Hi Mike, I read in another thread that to disable the LTC787X's phase, I need to connect the SNSA+, SNSD+, and SNS- pins together with VLOW. Otherwise, if I could just disable the respective MOSFET driver, the schematic would be easier to implement.
        

        thank a lot
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
				
				
				
		
		
        
			
		
        
	
        

        

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