• State Verified Answer
  • +1 person also asked this people also asked this
  • Replies 2 replies
  • Subscribers 33 subscribers
  • Views 801 views
  • Users 0 members are here
Options
Related 

        

            Post
             Go back to editing
        

    

    


    

    









		











	
	
			
	
			
		
	
	
		

		
Is there an isolated DC/DC 3.3V efficient at low current (less than 2mA)



		

			

									
						gagmguerrero
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Nov 26, 2020 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hi,


I am working in the isolation stage of an ultra-low power application. I need to produce an isolated power supply for the isolated side and I have not found an Isolated DC/DC 3.3V to 3.3V efficient at less than 2mA of current.




The most adapted solution that I found in analog is the Adum5028 (less than 20% of efficiency at 2mA). Is there another one that is more efficient? Also, if the solution comes in a small footprint, way better.




Thank you,




Gustavo

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	










	

	

					



			








	
	
	
	



Parents
	
    
	

  • 
	
    



	
			
		
	



    
	
    
		
    
							
					
    
		
    
			
													+1
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on Nov 26, 2020 5:00 PM
            
            
					
    
	
    

		
		
    
					
    ADuM5028 is a very compact solution and although efficiency with small load is low, alternatives might be the same or lower. There are discrete power supply options such as flyback converters (e.g. LT8302) that offer higher output power & voltages, but the isoPower parts are convenient as small drop-in solutions without the need to design an application-specific isolated power supply.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

    • 

	




Reply

    


  • 
	
    



	
			
		
	



    
	
    
		
    
							
					
    
		
    
			
													+1
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on Nov 26, 2020 5:00 PM
            
            
					
    
	
    

		
		
    
					
    ADuM5028 is a very compact solution and although efficiency with small load is low, alternatives might be the same or lower. There are discrete power supply options such as flyback converters (e.g. LT8302) that offer higher output power & voltages, but the isoPower parts are convenient as small drop-in solutions without the need to design an application-specific isolated power supply.
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

    • 





Children
	
    
	

  • 
	
    



	
		
	
	



    
	
    
		
    
							
					
    
		
    
			
													0
							
			
				
									
							        
            
                                    			
			                            
                        
                on Nov 27, 2020 2:38 PM
            
            
												
						in reply to ConalW
					
									
    
	
    

		
		
    
					
    ConalW, I checked the parts that you mentioned and I did not find an application circuit with a Vin=3.3V and a Vout isolated= 3.3V.
    

    And in most of the cases, the curves of efficiency does not show the efficiency at low currents.
    

    I am working in a specific application and I need efficient isolated power 3.3V from 3.3V power supply at low current levels (less than 2mA).
    

    If there is no more efficient option than the ADuM5028, I will buy it.
    

    Best regards,
    

    

    Gustavo
    

      
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

    •