SLA Information

SLA Status Assignee Support Status
SLA Closed.
Missed after 819 hours		 Awaiting Company Response
 
Activating this link will open 2 new browser tabs.

Products Mentioned

MAX16126 Production
The MAX16126/MAX16127 load-dump/reverse-voltage protection circuits protect power supplies from damaging input voltage conditions, including overvoltage...
Datasheet
MAX16126 on Analog.com

Thread Details

  • State Not Answered
  • Replies 6 replies
  • Subscribers 40 subscribers
  • Views 180 views
  • Users 0 members are here
Related Content

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
Reverse voltage current path on MAX16126

		
	
				

			

									
					    zari
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on May 13, 2026 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Hardware

    		        		            		    
Product Number:  MAX16126  

    		        		    		    

		    		    
		    			

			    
My MAX16126 circuit is short-circuited in the reverse polarity. My suspicion is it's because of the body diodes in my dual-FET package. I would have thought the protection diode would do the same if there is a path through the SRC pin, but since it's part of the recommended datasheet circuit, I didn't think it was an issue. Does anyone have any advice on how to fix this?

 

			

			
									
		                             
                        

    

                                            
                 hardware
                
                                                    
                 MAX16126
                
                                                    
                 reverse voltage
                
                                                    
                 MAX16126TCA+T
                
                                                    
                 Protection Switches & Controllers
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



Parents
	
    
	

  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
		    
		    		    
			
				
									
							        
			
			
			
    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 9, 2026 5:28 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Thanks for trying that test. That rules out the output side as the primary cause.

    Could you try applying reverse polarity with a current limited supply?
    And provide the measurements below:
    Reverse current being drawn
    IN voltage
    OUT voltage
    SRC voltage
    GATE voltage

    In the next step to debug, this should help figure out if the current path is through the MAX16126, the MOSFETs, or another path on the board.

    Let me know if you have any questions or if anything comes up in the meantime.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

    • 

	




Reply

    


  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
		    
		    		    
			
				
									
							        
			
			
			
    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jul 9, 2026 5:28 PM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Thanks for trying that test. That rules out the output side as the primary cause.

    Could you try applying reverse polarity with a current limited supply?
    And provide the measurements below:
    Reverse current being drawn
    IN voltage
    OUT voltage
    SRC voltage
    GATE voltage

    In the next step to debug, this should help figure out if the current path is through the MAX16126, the MOSFETs, or another path on the board.

    Let me know if you have any questions or if anything comes up in the meantime.
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

    • 





Children
	
No Data


		
			








	





































     



















		        
        

            
Before You Switch

            
        

        

        

            Switching languages will make ADI Explorer unavailable. Resume your session by switching back to English and reopening ADI Explorer.