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| Part Number | LT3999IMSE#TRPBF | LT3990IMSE#TRPBF | LT3991IMSE#TRPBF | LT3995IMSE#TRPBF | LT3999EMSE#TRPBF | LT3999HMSE#TRPBF | 
|---|---|---|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | 
| Product Status | Active | Active | Active | Active | Active | Active | 
| Function | Step-Up/Step-Down | Step-Down | Step-Down | Step-Down | Step-Up/Step-Down | Step-Up/Step-Down | 
| Output Configuration | Positive, Isolation Capable | Positive | Positive | Positive | Positive, Isolation Capable | Positive, Isolation Capable | 
| Topology | Push-Pull | Buck | Buck | Buck | Push-Pull | Push-Pull | 
| Output Type | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | 
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 
| Voltage - Input (Min) | 2.7V | 4.2V | 4.3V | 4.3V | 2.7V | 2.7V | 
| Voltage - Input (Max) | 36V | 62V | 55V | 60V | 36V | 36V | 
| Voltage - Output (Min/Fixed) | - | 1.21V | 1.19V | 1.197V | - | - | 
| Voltage - Output (Max) | - | 25V | 30V | 55.8V | - | - | 
| Current - Output | 1A | 350mA | 1.2A | 3A | 1A | 1A | 
| Frequency - Switching | 50kHz ~ 1MHz | 210kHz ~ 2.3MHz | 200kHz ~ 2MHz | 200kHz ~ 2.25MHz | 50kHz ~ 1MHz | 50kHz ~ 1MHz | 
| Synchronous Rectifier | No | No | No | No | No | No | 
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -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 | Surface Mount | Surface Mount | 
| Package / Case | 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad | 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 | 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad | 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad | 
| Supplier Device Package | 10-MSOP-EP | 16-MSOP-EP | 10-MSOP-EP | 16-MSOP-EP | 10-MSOP-EP | 10-MSOP-EP |