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MAX3218 Production
The MAX3218 RS-232 transceiver is intended for battery-powered EIA/TIA-232E and V.28/V.24 communications interfaces that need two drivers and two receivers...
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MAX3218 on Analog.com

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MAX3218 Internal DC-DC converter behavior

		
	
				

			

									
					    JMJEngineeringConsulting
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 22, 2026 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user asked about the switching frequency and pulse-skipping mode of the MAX3218 internal boost converter. The final answer indicates that the MAX3128 DC-DC converter operates in discontinuous conduction mode at low loads, with pulses up to 200us apart when VCC = 1.8V. Under heavy loads, the switching frequency increases to approximately 200kHz. The accompanying answer acknowledged the delay in response.
                        	    

                
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Category: Hardware

    		        		            		    
Product Number:  MAX3218 , MAX321 

    		        		    		    

		    		    
		    			

			    
What is the designed switching frequency of MAX3218 internal boost? Does it go into pulse-skipping mode at all? Our input voltage supply is +1.8V. 

			

			
									
		                                 
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                 hardware
                
                                                    
                 MAX3218
                
                                                    
                 Interface Transceivers & Isolators
                
                                                    
                 switches and multiplexers
                
                                                    
                 MAX321
                
                                        
                                            
                
                
                                
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 26, 2026 2:26 PM
            
            
						
			            		
    
		
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    Hello,
    

    Thank you for your patience.  The MAX3128 DC-DC operates in discontinuous conduction mode at low-load conditions. When VCC = 1.8V, at low-load currents, pulses may be as far as 200us apart (no load or very little load). The switching frequency increases to something closer to 200kHz (typ) under heavy loads.
    

    Best,
    

    Shasta
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 26, 2026 2:26 PM
            
            
						
			            		
    
		
										+1
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Hello,
    

    Thank you for your patience.  The MAX3128 DC-DC operates in discontinuous conduction mode at low-load conditions. When VCC = 1.8V, at low-load currents, pulses may be as far as 200us apart (no load or very little load). The switching frequency increases to something closer to 200kHz (typ) under heavy loads.
    

    Best,
    

    Shasta
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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