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MAX17703 Production
The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power supply solutions. The MAX17703 is a...
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MAX17703 on Analog.com

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Maxim Integrated MAX17703 Dev Kit Power On Issue

		
	
				

			

									
					    MHamza
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jul 3, 2024 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Hardware

    		        		            		    
Product Number:  175-MAX17703EVKIT 

    		        		    		    

		    		    
		    			

			    
I have purchased the Maxim Integrated Analog Devices development kit MAX17703. Here is the link to the datasheet: MAX17703EVKITA Datasheet. The kit is designed for 4.2V, but I have changed the kit's output voltage to suit my application. I want to charge multi-cell lithium-ion batteries with two batteries in series. I am using Panasonic NRC 3400mAh 3.7V green batteries (NRC18650B). The kit's datasheet states that the input voltage range is 6.3V to 60V.


In my case, I changed the VOUT to 8.4V by adjusting RTOP and RBOT, choosing 42.2kΩ for RTOP and 7.32kΩ for RBOT. I also changed the battery deep discharge level to 6V by adjusting R4 in the dev kit to 22kΩ. The charger seems to work fine and charges the batteries, but I am encountering a problem: when the input voltage DCIN to the kit is less than or qual to 12.5v and the battery voltage is around 6.5 to 7V or less, the charger will not start until I provide 13.8V or 14V. When I apply a DCIN input greater than 13.5V, the charging kit turns on and starts charging.


If the charging kit's minimum DC input voltage is 6.3V, why does the charger kit not start at 10V or 11V? Additionally, sometimes the charging kit does not stop charging, and the batteries overheat. I simply connect the batteries at the VOUT pin with two batteries in series. Please help me resolve this issue as soon as possible.




   

			

			
									
		                             
                        

    

                                            
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                 Battery Management System
                
                                                    
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