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LTM4613 Recommended for New Designs
The LTM4613 is a complete, ultralow noise, 8A switch mode DC/DC power supply. Included in the package are the switching controller, power FETs, inductor...
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LTM4613 on Analog.com

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LTM4613 Input Bulk Capacitor Requirement



		

			

									
					    sdt_user123
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on May 9, 2020 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    

    I will use LTM4613 in my design. Input voltage is about 28V, output is 12V. The system need about 3A from 12V.
    

    Because of mechanical contraints I can't use 100uF input bulk capacitor. Instead of bulk capacitor, can i use multiple 10uF ceramic or tantalium capacitors?
    

    Thank you.
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Ultralow Noise Regulators
                
                                                    
                 LTM4613
                
                                                    
                 switching regulators
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hi sdt_user123, 
      

      Bulk electrolytic input capacitor is not required, this capacitor is in place on the demo board in case significantly inductive input cables were used on the input (input ringing). In either case these could be replaced with tantalum type which have sufficient RMS current rating (won't get too hot, lossy). Otherwise ceramic capacitors should be sufficient, they are most critical as they have low ESR, ESL and handle the input RMS current.  
      

      Thanks.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hi sdt_user123, 
      

      Bulk electrolytic input capacitor is not required, this capacitor is in place on the demo board in case significantly inductive input cables were used on the input (input ringing). In either case these could be replaced with tantalum type which have sufficient RMS current rating (won't get too hot, lossy). Otherwise ceramic capacitors should be sufficient, they are most critical as they have low ESR, ESL and handle the input RMS current.  
      

      Thanks.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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