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LTC4366 Recommended for New Designs
The LTC4366 surge stopper protects loads from high voltage transients. By controlling the gate of an external N-channel MOSFET, the LTC4366 regulates the...
Datasheet
LTC4366 on Analog.com

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LTC4366 with parallel FETs?

		
	
				

			

									
					    Ryan_M
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on May 12, 2022 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user is designing a circuit with the LTC4366 and is considering using two FETs in parallel to meet SOA needs during surges. The final answer confirms that the LTC4366 can drive two FETs in parallel, which will naturally balance current during normal operation. A low Qg FET is recommended to reduce the driving load on the IC. The control loop should handle multiple FETs without leading to instability, but tight regulation during surges is not guaranteed.
                        	    

                
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Category: Hardware

    		        		            		    
Product Number:  LTC4366 

    		        		    		    

		    		    
		    			

			    
I'm designing a new circuit with the LTC4366 and having trouble finding a suitable, in-stock FET that can meet my SOA needs during a surge.  Is it possible to use two FETs in parallel with this device?  During normal (non-surge) operation will they naturally balance current based on heating?  During surges will the control loop for the 4366 be able to handle multiple FETs or will it lead to instability?  I'm not too concerned with having tight regulation during a surge. 

			

			
									
		                             
                        

    

                                            
                 hardware
                
                                                    
                 Power Monitor  Control  and Protection
                
                                                    
                 ltc4366
                
                                                    
                 Surge Stopper  Overvoltage  and Overcurrent Protection
                
                                                    
                 Protection Switches & Controllers
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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							FormerMember
					
    
		
    
		    
		    		    
			
				
									FormerMember
							        
			
			
			
            
						
                            
            
            				
            
                on May 17, 2022 10:42 PM
            
            
						
			            		
    
		
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    Hi Ryan,
    

    LTC4366 should be able to drive two FETs in parallel. Pick a low Qg FET to lower the load for the IC to drive since you're driving multiple MOSFETs.
    

    Ryan_M said:
    During normal (non-surge) operation will they naturally balance current based on heating? 
    

    Yes. This is correct. As long as you follow the datasheet recommendation, this should be fine.

    

    Regards,
    

    Jhun
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
				
				
				
		
		
    
			
		
    
	
    

    

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