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LTM8033 Production
The LTM8033 is an electromagnetic compatible (EMC) 36V, 3A DC/DC µModule® (power module) buck converter designed to meet the radiated emissions requirements...
Datasheet
LTM8033 on Analog.com

LTM8022 Production
The LTM8022 is a complete 1A, DC/DC µModule (power module) step-down regulator. Included in the package are the switching controller, power switches, inductor...
Datasheet
LTM8022 on Analog.com

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Using the LTM8033 as a DCDC converter for negative output voltages

		
	
				

			

									
					    Gruffalo
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 1, 2023 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about using the LTM8033 uModule in a similar configuration to the LTM8022 for negative output voltages. The final answer confirmed that while the LTM8033 can be used in such a configuration, it cannot deliver the specified 3A current and would require paralleling multiple units. The PSRR and noise characteristics are expected to be similar to those specified in the datasheet for positive voltages, but the inverting configuration is inherently noisier due to discontinuous output current.
                        	    
    
                
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    Category: Hardware
    
    		        		            		    
    Product Number:  LTM8033 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Dear All,
    

    

    Can the LTM8033 uM be used in a similar configuration as e.g. the LTM8022 on p. 15 in LTM8022 datasheet?
    

    

    Will the LTM8033 be able to deliver the specified 3A current? What about PSRR and noise? do they differ from what specified in the datasheet for positive voltages?
    

    

    Best Regards
    
			
    
			
									
		                             
                        

    
    
                                            
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                on Jun 7, 2023 2:40 AM
            
            
						
			            		
    
		
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    Gruffalo said:
    Can the LTM8033 uM be used in a similar configuration as e.g. the LTM8022 on p. 15 in LTM8022 datasheet?
    

    You should be able to.
    

    

    Gruffalo said:
    Will the LTM8033 be able to deliver the specified 3A current? 
    

    Not likely. You would need to have paralleled LTM8033 to produce 3A of current in the negative configuration.
    

    

    Gruffalo said:
    What about PSRR and noise? do they differ from what specified in the datasheet for positive voltages?
    

    Most likely not. In a buck converter, the output side has a continuous current. In an inverting configuration, a discontinuous current is seen at the output which is why an inverting buck boost is noisier compared to a buck converter.