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LTC4364 Recommended for New Designs
The LTC4364 surge stopper with ideal diode controller protects loads from high voltage transients. It limits and regulates the output during an overvoltage...
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LTC4364 on Analog.com

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LTC4364: MOSFETs Rds(on) instead of Rsense



		

			

									
					    SLevin440
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 17, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    

    I'm building high current power source and plan to use LTC4364 as a ID controller and current limiter in case of short circuits events at output.
    

    To be effective I've thought of using FETs Rds(ON) as a Rsense for current limiting feature. Can you advise if this method possible in this controller and application?
    

    Thanks 
    

    Sergey
    
									
			        
		
    

				
						
        

    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 17, 2020 3:22 PM
            
            
					
      
	
      

		
		
      
					
      Using FET Rds(on) for current sensing yields a much larger tolerance on current limiting when compared to a sense resistor (e.g., see LTC4213). The FET configuration here is unclear but I don't think it works out since SENSE-OUT absolute maximum rating is +/- 30V max and the SENSE pin is used not just for current limiting but also for ideal diode control.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 17, 2020 3:22 PM
            
            
					
      
	
      

		
		
      
					
      Using FET Rds(on) for current sensing yields a much larger tolerance on current limiting when compared to a sense resistor (e.g., see LTC4213). The FET configuration here is unclear but I don't think it works out since SENSE-OUT absolute maximum rating is +/- 30V max and the SENSE pin is used not just for current limiting but also for ideal diode control.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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