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LT3041 Recommended for New Designs
The LT3041 is a high-performance, low-dropout linear regulator featuring Analog Devices, Inc., ultra-low noise and ultra-high power supply rejection ratio...
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LT3041 on Analog.com

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Regarding the maximum capacitance of Cset when connecting LT3041 in parallel

		
	
				

			

									
					    kuro5532
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 5, 2026 
				
			
			
		
    
		
		                    	    
    
        	    
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                The user asked if the maximum capacitance for Cset becomes 44uF when using two LT3041s in parallel. The final answer clarifies that a 22uF capacitor can be placed at the SET pin of each LT3041, and the RSET value should be adjusted to maintain the RSET,CSET time constant for low-frequency noise performance. Each SET pin should have its own capacitor to prevent noise coupling.
                        	    
    
                
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    Category: Hardware
    
    		        		            		    
    Product Number:  LT3041  
    
    		        		    		    
    
		    		    
		    			
    
			    
    The LT3041 datasheet specifies a maximum capacitance of 22uF for Cset.
    

    

    For example, when using two LT3041s in parallel, assume their SET pins are shorted together and Rset and Cset are shared.
    

    

    In this case, would the maximum capacitance for Cset become 44uF?
    
			
    
			
									
		                             
                        

    
    
                                            
                 LT3041
                
                                                    
                 hardware
                
                                                    
                 LDO Linear Regulators
                
                                                    
                 Linear Regulator
                
                                                    
                 Positive Linear Regulators (LDO)
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Mar 9, 2026 10:52 PM
            
            
						
			            		
      
		
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      Hello kuro5532,
       
      It is o.k. to put a 22uF at the SET pin of each LT3041 when the LT3041s are in parallel.  
      When you put LT3041s in parallel, you use a smaller RSET to program VOUT because the 100uA current references are in parallel.
       If RSET is smaller, then CSET needs to increase proportionally to maintain the overall RSET,CSET time constant that determines the low frequency noise performance.
      It is important to have a capacitor at each SET pin to prevent noise from coupling from the PCB traces into the SET pin.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
				
				
				
		
		
      
			
		
      
	
      

      

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                on Mar 9, 2026 10:59 PM
            
            
						
			            		
        
		
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        What I want to know is whether the upper limit of Cset increases proportionally to the number of LT3041s in parallel.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
				
				
				
		
		
        
			
		
        
	
        

        

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