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LT4363 Recommended for New Designs
The LT4363 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in vehicles...
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LT4363 on Analog.com

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LT4363 3-500 uA leakage through SNS in shutdown mode



		

			

									
					    johandc
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 7, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    In shutdown mode the LT4363 is supposed to have 7 uA. However, if external power is supplied on the OUT / SNS pins, the leakage rises to 3-500 uA.
    

    This leakage is rather substantial and is not mentioned in the datasheet as far as i can tell.
    

    It is inconvenient for us because we use the LT4363 as an input protection (over voltage and over charge current) on a battery, so the OUT/SNS pins actually never goes to ground, even though we switch off the enable signal (see attached schematics)
    

    If you have any idea of why this happens, and what we could have done to see this, from the datasheet, it would be appreciated.
    

    

     
    

    

    Thank you,
    

    Johan Christiansen
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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                on Oct 16, 2021 6:52 AM
            
            
												
						in reply to PSachdev
					
									
        
	
        

		
		
        
					
        I know that.
        

        I do have a second 4363 next to it. I need to current limit both input (charge) and output (discharge), with different thresholds.
        

        The question is regarding our observation. That there os a very large leakage into the out pin, when in standby mode.
        

        If you say that is by design, it would have been nice if there was a notice in the datasheet about that. We have wasted a lot of money because of this leakage. and need to redesign our product.
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
			                            
                        
                on Oct 19, 2021 7:36 PM
            
            
												
						in reply to johandc
					
									
        
	
        

		
		
        
					
        In shutdown, GATE is pulled down. If OUT is held up (unexpected operation for LT4363), this GATE pulldown current will go through the internal GATE-OUT 14V clamp (datasheet page 9) to OUT.
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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