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LTC4411 - Schottky diode selection for automatic power switch over



		

			

									
						jlittle
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Aug 7, 2019 
				
			
			
		


				
		

		    		    
		    
		    	
			
I'm in the process of designed a simple power supply OR switch using the LTC4411.  The main supply is regulated 3.3V from a battery while the secondary source is a regulated 3.3V supplied via a 12V wall adapter. 


I have trouble properly selecting the schottky diode that is recommended in the applications notes from the data sheet.


Thanks

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	










	

	

					



			








	
	
	
	



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                                 Analog Employees 
                                
                            
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                on Aug 20, 2019 12:01 AM
            
            
					
    
	
    

		
		
    
					
    Hi,  The Schottky diode needs to have a reverse breakdown greater than 3.3V (plus margin) and should be rated for your load current. Note that a 0.3V or 0.5V Schottky diode drop can eat up a significant portion of your 3.3V supply (10% to 15%). It may be better to use the LTC4413 dual ideal diode for your application.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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													0
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on Aug 20, 2019 12:01 AM
            
            
					
    
	
    

		
		
    
					
    Hi,  The Schottky diode needs to have a reverse breakdown greater than 3.3V (plus margin) and should be rated for your load current. Note that a 0.3V or 0.5V Schottky diode drop can eat up a significant portion of your 3.3V supply (10% to 15%). It may be better to use the LTC4413 dual ideal diode for your application.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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