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The LTM8049 is a Dual SEPIC/Inverting μModule® (power module) DC/DC Converter. Each of the two outputs can be easily configured as a SEPIC or Inverting...
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LTM8049 LTSpice model, share pins configuration

		
	
				

			

									
					    hlei
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 3, 2026 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user asked about the connection of SHARE1 and SHARE2 pins in the LTSpice demo circuit for the LTM8049. The final answer confirmed that these pins should only be connected when using the outputs in parallel; for separate supplies, they should be left floating. The user noted that the demo schematic should be corrected, and the support engineer acknowledged this and informed the product line.
                                    

                    

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Category: Hardware

    		        		            		    
Product Number:  LTM8049 

    		        		    		    

		    		    
		    			

			    
The LTSpice demo circuit for LTM8049 has share pins connected: https://www.analog.com/en/resources/design-tools-and-calculators/ltspice-simulator/lt-spice-demo-circuits.html 

 

From datasheet, this should only be done when using outputs in parallel configuration, to enable current sharing.  This is not the configuration of the demo LTSpice schematic.  

 

Although the simulation seems to work, changing load conditions will give bad results.  Removing the share net improves the simulation.

Can you confirm that for this configuration (or other dual rail configurations), the share pins should be connected or not?

Thanks in advance

			

			
									
		                             
                        

    

                                            
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