Products Mentioned

LTC2980-24 Recommended for New Designs
The LTC2980-24 is a 24-channel Power System Manager used to sequence, trim (servo), margin, supervise, manage faults, provide telemetry and create fault...
Datasheet
LTC2980-24 on Analog.com

LT8625SP Recommended for New Designs
The LT8625SP/LT8625SP-1 synchronous step-down regulator features third-generation Silent Switcher technology which is uniquely designed to combine an ultralow...
LT8625SP on Analog.com

LTC2977 Recommended for New Designs
The LTC2977 is an 8-channel Power System Manager used to sequence, trim (servo), margin, supervise, manage faults, provide telemetry and create fault logs...
Datasheet
LTC2977 on Analog.com

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Trimming Output Voltage of LT8625SP-1 with LTC2980-24 (or LTC2977)

		
	
				

			

									
					    bobo321
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 28, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LT8625SP-1, LT8625SP, LT8625SP 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hi,
    

    How to trim LT8625SP-1, or any regulator with SET pin (usually from silent switcher 3 products family) using LTC2980-24 DAC, up to 3.3V or more?
    

    The DAC maximum output up-to ~2.6V, and applying amplification at DAC output is not applicable since the Hi-Z output (or "DAC Disconnect" feature) will not result Hi-Z at opamp output.
    

    

    Thanks,
    

    Ita
    
			
    
			
									
		                             
                        

    
    
                                            
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                on Dec 11, 2025 10:24 AM
            
            
						
			            		
        
		
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        Another feature I use a lot is "DAC Disconnect", which turns DAC output to Hi-Z, then, SET pin is defined only by default Rset and internal 100uA. It is very useful for sanity test in a large environment with many power rails.
        

        With opamp after the DAC, the opamp output will drive to VCC or 0V the SET pin when DAC is at Hi-Z.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
				
				
				
		
		
        
			
		
        
	
        

        

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                on Dec 11, 2025 10:24 AM
            
            
						
			            		
          
		
										0
					
	
          

		
		
          
		
          
                                
                                                            
          
					
          Another feature I use a lot is "DAC Disconnect", which turns DAC output to Hi-Z, then, SET pin is defined only by default Rset and internal 100uA. It is very useful for sanity test in a large environment with many power rails.
          

          With opamp after the DAC, the opamp output will drive to VCC or 0V the SET pin when DAC is at Hi-Z.
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
				
				
				
		
		
          
			
		
          
	
          

          

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