Products Mentioned

LT3959 Production
The LT3959 is a wide input range, current mode, DC/DC controller which is capable of regulating either positive or negative output voltages from a single...
Datasheet
LT3959 on Analog.com

LT3086 Recommended for New Designs
The LT3086 is a multi-feature, low dropout, low noise 2.1A linear regulator that operates over a 1.4V to 40V input supply range. Dropout voltage at 2.1A...
Datasheet
LT3086 on Analog.com

Thread Details

  • State Verified Answer
  • Replies 1 reply
  • Subscribers 38 subscribers
  • Views 455 views
  • Users 0 members are here 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
LT3959 configuration

		
	
				

			

									
					    skapicioglu
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 6, 2021 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hello I have a circuit which requires 10V DC supply. However, I have only 5V DC input and I am planning to use LT3959 for 5V to 12V conversion with SEPIC configuration and than use LT3086 LDO for converting it to cleaner 10V DC. Is it meaningful? if not, can you give me some advice? I am not sure about 5V to 12V conversion step since the convert ratio is more than two. I also need to know how much current LT3959 can give me in that configuration. LT3959 datasheet does not give detailed information about current capability of the LT3959 for different in/out voltage configurations.
    Thanks in advance
    
			
    
			
									
		                             
                        

    
    
                                            
                 SEPIC Regulators
                
                                                    
                 switching regulators
                
                                                    
                 LDO Linear Regulators
                
                                                    
                 lt3086
                
                                                    
                 LT3959
                
                                        
                                            
                
                
                                
                    Show More
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
		    
		    		    
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Jan 7, 2021 7:38 AM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hello,
      

      the LT3959 can be used for a 5V to 12V conversion (Boost and SEPIC topology are possible). Output Current capability is described on page 13(Boost) and page 15(SEPIC). Do the math with your topology and Vin/Vout values.  Internal power switch is rated with 6A(minimum) and will deliver plenty of output power. How much do you need?
      

      Check the Evalboard which fits your application requirement:
      www.analog.com/.../dc1853af.pdf
      

      LDO is only necessary if your load demands for low noise/low ripple supply.
      

      

      kind regards
      

      Markus
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
				
				
				
		
		
      
			
		
      
	
      

      

      •