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LTC4041 Recommended for New Designs
The LTC4041 is a complete supercapacitor backup system for 2.9V to 5.5V supply rails. It contains a high current step-down DC/DC converter to charge a...
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LTC4041 on Analog.com

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LTC4041 - SYSGD Comparator



		

			

									
					    acortellini
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 4, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi Everyone,
    

    Looking at the block diagram of the LTC4041 the SYSGD Comparator seems to be a stand alone sub-circuit.
    

    My question is if it can be repurposed as programmable threshold of the voltage of the super capacitor connecting an external resistor divider is used between SCAP, RSTFB and GND.
    

    The idea is to have a digital signal when the voltage of the super cap is below a certain threshold programmed by the voltage divider.
    

    Thanks
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 power management
                
                                                    
                 Supercapacitor Chargers
                
                                                    
                 LTC4041
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hello,
      

      Interesting idea. We do not see an issue with this. The comparator is powered by Max(VIN, VSCAP) so power will not be an issue, and these signals are not used for any internal logic.
      

      Bear in mind that there is a CAPGD signal already, but it does not have a custom threshold. If you would prefer a custom threshold and do not need the SYSGD signal, then this is a slick solution.
      

      

      Regards,
      

      Zack
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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