| Parameters | 
                                
                                                                                                            
                                            | Mfr | 
                                            Analog Devices Inc. | 
                                        
                                                                            
                                            | Series | 
                                            - | 
                                        
                                                                            
                                            | Package | 
                                            Tube | 
                                        
                                                                            
                                            | Product Status | 
                                            Active | 
                                        
                                                                            
                                            | Function | 
                                            Step-Down | 
                                        
                                                                            
                                            | Output Configuration | 
                                            Positive | 
                                        
                                                                            
                                            | Topology | 
                                            Buck | 
                                        
                                                                            
                                            | Output Type | 
                                            Fixed | 
                                        
                                                                            
                                            | Number of Outputs | 
                                            1 | 
                                        
                                                                            
                                            | Voltage - Input (Min) | 
                                            4.3V | 
                                        
                                                                            
                                            | Voltage - Input (Max) | 
                                            55V | 
                                        
                                                                            
                                            | Voltage - Output (Min/Fixed) | 
                                            5V | 
                                        
                                                                            
                                            | Voltage - Output (Max) | 
                                            - | 
                                        
                                                                            
                                            | Current - Output | 
                                            1.2A | 
                                        
                                                                            
                                            | Frequency - Switching | 
                                            200kHz ~ 2MHz | 
                                        
                                                                            
                                            | Synchronous Rectifier | 
                                            No | 
                                        
                                                                            
                                            | Operating Temperature | 
                                            -40°C ~ 125°C (TJ) | 
                                        
                                                                            
                                            | Mounting Type | 
                                            Surface Mount | 
                                        
                                                                            
                                            | Package / Case | 
                                            10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad | 
                                        
                                                                            
                                            | Supplier Device Package | 
                                            10-MSOP-EP | 
                                        
                                                                            
                                            | Base Product Number | 
                                            LT3991 | 
                                        
                                                                            
                                            | RoHS Status | 
                                            ROHS3 Compliant | 
                                        
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 
                                            1  (Unlimited) | 
                                        
                                                                            
                                            | REACH Status | 
                                            REACH Unaffected | 
                                        
                                                                            
                                            | ECCN | 
                                            EAR99 | 
                                        
                                                                            
                                            | HTSUS | 
                                            8542.39.0001 | 
                                        
                                                                            
                                            | Other Names | 
                                            -2735-LT3991IMSE-5#PBF | 
                                        
                                                                            
                                            | Standard Package | 
                                            50 | 
                                        
                                                                                                    
                            
                         
                                                Buck Switching Regulator IC Positive Fixed 5V 1 Output 1.2A 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad