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The LT1054 is a monolithic, bipolar, switched-capacitor voltage converter and regulator. The LT1054 provides higher output current than previously available...
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LT1054 on Analog.com

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LT1054IS8#PBF too hot

		
	
				

			

									
					    LEGLAUDE
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 3, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LT1054IS8#PBF, LT1054 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello, 
    

    I use two LT1054IS8#PBF to generate a voltage of -11V from a +12V but which can deliver 130mA max.
    The two LT1054IS8#PBF are wired in parallel.
    I have a 1ohm ballast resistor on each output. Nevertheless, I have a regulator that heats up more than the other. I deduce that there is only one of the two who is cutting from the current. But I don’t understand why.
    If you have an idea.
    


    Thank you in advance
    

    

     
    
			
    
			
									
		                                 
    Thread Notes  
    
                
    
        
                                        
                        

    
    
                                            
                 hardware
                
                                                    
                 lt1054
                
                                                    
                 Inductorless (Charge Pump) DC/DC Converters
                
                                                    
                 LT1054IS8#PBF
                
                                                    
                 Regulated Step-Up Charge Pumps
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 3, 2025 1:58 PM
            
            
						
			            		
      
		
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      Hello,
      

      The best way to use two LT1054 in parallel to regulate and share current is to connect up like the example circuit below. The OSC pin of IC #2 is connected to the CAP+ pin of IC #1 thru a Schottky diode. Please also note that the CIN caps across the CAP+ and CAP- pins have a resistor to help limit the current in the CAP. That may be needed for low ESR MLCC caps. 
      

       
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
				
				
				
		
		
      
			
		
      
	
      

      

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