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LTM4622 Recommended for New Designs
The LTM4622 is a complete dual 2.5A step-down switching mode µModule® (powermodule) regulator in a tiny ultrathin 6.25mm × 6.25mm × 1.82mm LGA and 6.25mm...
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LTM4622 on Analog.com

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LTM4622 &LTM4705   Frequency Set for Dual Output voltage



		

			

									
					    KLN
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Mar 3, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LTM4622 LTM4705 
    
    		        		    		    	
			
    Hi 
    

    We are using LTM4622 Dual Output Voltage part for Vout1 3.3V and Vout2 - 1.8V.
    

    The datasheet specifies Frequency pin  : For 1.8V, FREQ Pin should be left open to set 1MHz and For 3.3V FREQ Pin to be connected ground with 324K to set 2MHz
    

     
    

    Q1: In Two different output (LTM4622) Switching frequency Fsw of regulator will be same for both output, Right?
    

    Q2: In my case, Where I've Vout1-3.3V and Vout2- 1.8V, What should be the Switching frequency set to?
    

    If I set Fsw- 1 MHz, For 3.3V, Inductor ripple current as per the datasheet calculation, it results 2.392 A which is exceeding "1.2A peak-to-peak inductor ripple current" 
    

    

    Same for LTM4705, Vout1-3.3V and Vout2- 1.35,
    

     
    

    What should be Fsw?