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ADP2389 Last Time Buy
The ADP2389/ADP2390 are current mode control, synchronous step-down, dc-to-dc regulators. They integrate a 17 mΩ high-side power MOSFET and a 4.5 mÎ...
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ADP2389 on Analog.com

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About ADP2389 Accuracy and minus current

		
	
				

			

									
					    Yuya
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Sep 19, 2017 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
Hi, 

 
I would like to use ADP2389.

 
So, I have two questions.

 
#1  When RILIM = 59 kΩ, the peak current is stated as 15 ~ 18.6 A. (From data sheet)
　   Is this variation in output peak current equivalent (about ± 10.7%) even if the resistance value is changed?
       Are there any indicators?

 
#2   Is there any problem if a negative current flows in the FET of ADP 2389?

 
Best Regards,

 
Yuya

			

			
									
		                             
                        

    

                                            
                 Internal Power Switch Buck Regulators
                
                                                    
                 adp2389
                
                                                    
                 Step-Down (Buck) Regulators
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Sep 21, 2017 7:41 AM
            
            
						
			            		
    
		
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    Hi Yuya,
    
 
    The RILIM sets the peak current limit threshold of the inductor peak current and not of the output peak current.  You'll get about ± 10.7% variation if the resistor value is close to 59kΩ. May I know what RILIM are you planning to use so that we could check if how much will the variation be?
    
 
    There won't be any problem if negative current flows in the FET as long as it is less than 4A.
    
 
    Best Regards,
    
 
    Alex
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
				
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Sep 21, 2017 7:41 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi Yuya,
    
 
    The RILIM sets the peak current limit threshold of the inductor peak current and not of the output peak current.  You'll get about ± 10.7% variation if the resistor value is close to 59kΩ. May I know what RILIM are you planning to use so that we could check if how much will the variation be?
    
 
    There won't be any problem if negative current flows in the FET as long as it is less than 4A.
    
 
    Best Regards,
    
 
    Alex
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
				
				
				
		
		
    
			
		
    
	
    

    

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