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| Part Number | LT3990IMSE-5#PBF | LT3991IMSE-5#PBF | LT3990EMSE-5#PBF | LT3990HMSE-5#PBF | 
|---|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | 
| Product Status | Active | Active | Active | Active | 
| Function | Step-Down | Step-Down | Step-Down | Step-Down | 
| Output Configuration | Positive | Positive | Positive | Positive | 
| Topology | Buck | Buck | Buck | Buck | 
| Output Type | Fixed | Fixed | Fixed | Fixed | 
| Number of Outputs | 1 | 1 | 1 | 1 | 
| Voltage - Input (Min) | 4.2V | 4.3V | 4.2V | 4.2V | 
| Voltage - Input (Max) | 62V | 55V | 62V | 62V | 
| Voltage - Output (Min/Fixed) | 5V | 5V | 5V | 5V | 
| Voltage - Output (Max) | - | - | - | - | 
| Current - Output | 350mA | 1.2A | 350mA | 350mA | 
| Frequency - Switching | 210kHz ~ 2.3MHz | 200kHz ~ 2MHz | 210kHz ~ 2.3MHz | 210kHz ~ 2.3MHz | 
| Synchronous Rectifier | No | No | No | No | 
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 150°C (TJ) | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 16-TFSOP (0.118", 3.00mm Width) Exposed Pad | 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad | 16-TFSOP (0.118", 3.00mm Width) Exposed Pad | 16-TFSOP (0.118", 3.00mm Width) Exposed Pad | 
| Supplier Device Package | 16-MSOP-EP | 10-MSOP-EP | 16-MSOP-EP | 16-MSOP-EP |