Products Mentioned

LTC3859 Recommended for New Designs
The LTC3859 is a high performance triple output (buck/ buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET...
Datasheet
LTC3859 on Analog.com

LTC3859AL Production
The LTC3859AL is a high performance triple output (buck/buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET...
Datasheet
LTC3859AL on Analog.com

Thread Details

  • State Verified Answer
  • Replies 1 reply
  • Subscribers 40 subscribers
  • Views 1624 views
  • Users 0 members are here 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
LTC3859 - pcb reference design

		
	
				

			

									
					    SLA
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Nov 22, 2019 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user encountered issues with Vout3 blowing up when Vout2 is under load while designing a PCB based on Figure 15 of the LTC3859A datasheet. The final answer suggests checking the PCB layout to ensure switching nodes and gate drive traces are not routed near sensitive pins like ITH, FB, SS, FREQ, and MODE. The reference design files for the LTC3859A evaluation board are available for download.
                        	    

                
                     AI Generated Content
                
    	    

             
				
        		

		    
		    		    
		    			

			    
Hi,


Could you share with pcb reference design please?


As I do not found eval board for this IC I design pcb. Unfortunately looks like I did something wrong because load on Vout2 makes channel Vout3 blow up (if also under load).


So only Vout1 and Vout2 or Vout1 and Vout3 can work in same time.



I used your circuit Figure 15. High Efficiency 1.2V/3.3V Step-Down Converter with 10.5V SEPIC Converter.


Thanks SLA


  

			

			
									
		                             
                        

    

                                            
                 power management
                
                                                    
                 PMIC and Multifunction
                
                                                    
                 Multitopology DC/DC
                
                                                    
                 Step-Up (Boost) Regulators
                
                                                    
                 ltc3859al
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                        
                                            
                
                
                                
                    Show More