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LTC4292 Production
The LTC4292/LTC4291 chipset is a 4-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet...
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LTC4292 on Analog.com

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LTC4292 operation in undervoltage lockout

		
	
				

			

									
					    ninaleechie
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 20, 2026 
				
			
			
		
    
		
		                    	    
    
        	    
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                The user asked if the LTC4292 can be manually commanded to turn on a port when VEE is below the undervoltage lockout threshold (-25V). The final answer states that this is not possible if the LTC4292 is in UVLO. For lower VEE voltages, the LTC9101-1/LTC9103 is recommended due to its lower VEE UVLO threshold.
                        	    
    
                
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    Category: Hardware
    
    		        		            		    
    Product Number:  LTC4292  
    
    		        		    		    
    
		    		    
		    			
    
			    
    The LTC4292 can be commanded over the control interface to turn on a port manually, without proper detection/classification.  
    

    If VEE is below the undervoltage lockout threshold (typ. -25V), can I still command the port to turn on manually.  I understand proper 802.3 detection/classification will not work, but can I turn on the the output FET manually if VEE is -20V?
    
			
    
			
									    
    
			        
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[edited by: ninaleechie at 5:17 PM (GMT -4) on 20 Apr 2026]
				
    
						
		                             
                        

    
    
                                            
                 hardware
                
                                                    
                 Power Monitor  Control  and Protection
                
                                                    
                 LTC4292
                
                                                    
                 Power-over-Ethernet (PoE) Interface Controllers
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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