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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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                on Sep 21, 2017 7:53 AM
            
            
						
			            		
    
		
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    Hi, Alex
    
 
    Thank you for your answer.
    
 
    I understand setting the inductor current peak current limit threshold.
    If it is close to 59 kΩ, it is about ± 10.7% fluctuation, but as long as the value of resistance goes away from 59 kΩ it is said that unless I experiment, I do not know the degree of variation?
    Currently, I specifically have no plans to check variations.
    
 
    I realized that if the negative current is up to 4 A, it does not matter if it flows in.
    
 
    Best Regards,
    
 
    Yuya
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

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                on Sep 21, 2017 7:53 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hi, Alex
    
 
    Thank you for your answer.
    
 
    I understand setting the inductor current peak current limit threshold.
    If it is close to 59 kΩ, it is about ± 10.7% fluctuation, but as long as the value of resistance goes away from 59 kΩ it is said that unless I experiment, I do not know the degree of variation?
    Currently, I specifically have no plans to check variations.
    
 
    I realized that if the negative current is up to 4 A, it does not matter if it flows in.
    
 
    Best Regards,
    
 
    Yuya
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
				
				
				
		
		
    
			
		
    
	
    

    

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