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LT3092 Production
The LT3092 is a programmable 2-terminal current source. It requires only two resistors to set an output current between 0.5mA and 200mA. A multitude of...
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LT3092 on Analog.com

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LT3092 bypassing minimum current

		
	
				

			

									
					    Wowa
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Aug 10, 2021 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
Hey,


Is it possible to bypass the minimum current of 0.5mA of the LT3092 to avoid it to go trough the load?. Specially for the case when the load is near to 0Ohms.




 

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Aug 10, 2021 9:40 AM
            
            
						
			            		
    
		
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    Hello,
    

    the LT3092 does see only 'one' load for his pins where he sources the minimum of 0.5mA.
    

    If you want to separate the output current into two 'streams', one for the minimum output current of 500uA and one for your 'real' load I would suggest to use another LT3092 in parallel to your load which will be configured for your minimum load as well. So you have a stack of two 3092 where the lower LT3092 is working in parallel to your load.
    

    Do you have enough voltage headroom to do so?
    

    

    kr
    

    Markus
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
				
				
				
		
		
    
			
		
    
	
    

    

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                on Aug 23, 2021 1:17 AM
            
            
												
						in reply to MarkusHP
					
										
			            		
    
		
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    Hey MarkusHP,
    

    

    sorry for the late answer. I think another LT3092 in parallel to the load wouldn't work when the output Voltage of the 'upper' LT3092 is lower then 2V.
    

    Any other suggestions?
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

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