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ADR291 Production
The ADR291 and ADR292 are low noise, micropower precision voltage references that use an XFET® reference circuit. The new XFET architecture offers significant...
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ADR291 on Analog.com

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Absolute Maximum rating ADR291/2

		
	
				

			

									
					    kabekami
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Aug 8, 2019 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user inquired about the absolute maximum rating of the Vout pin, especially in cases where Vin is less than Vout. The support engineer provided curve trace graphs showing the internal circuit trips at around 0.5V difference between Vout and other pins, recommending Vout-Vin < 0.5V. The engineer also suggested adding external ESD protection if needed.
                        	    

                
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Hi , 




could you please let me know the Absolutist Maximum rating of  Vout pin .


I would like to know this because there are case when the input falls below the Vout and  Vin < Vout (Capacitor).




Thanking you 


With best regards and wishes 

			

			
									
		                             
                        

    

                                            
                 voltage references
                
                                                    
                 Micropower Voltage References
                
                                                    
                 ADR291
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Sep 3, 2019 3:13 AM
            
            
												
						in reply to ADIApproved
					
										
			            		
    
		
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    Hi Kabekami
    

    I tried to do some Curve Trace see graph below:
    

    1. Vout vs GND
    

     
    

    2. Vout vs Vin
    

     
    

    As you can see the internal circuit will trip at around .5V difference between the Vout and the other 2 pins. With this I would recommend to keep the Vout-Vin<0.5V. I'm still not sure if these response is that of the ESD or other else. 
    

    If need be, please add some external ESD that will trip below the trip point shown above at the output pin.
    

    

    Best Regards,
    

    Mon
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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