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| Part Number | LT3581EDE#PBF | LT3681EDE#PBF | LT3581IDE#PBF | LT3581HDE#PBF | 
|---|---|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | 
| Product Status | Active | Active | Active | Active | 
| Function | Step-Up, Step-Up/Step-Down | Step-Down | Step-Up, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | 
| Output Configuration | Positive or Negative | Positive | Positive or Negative | Positive or Negative | 
| Topology | Boost, Charge Pump, Cuk, Flyback, SEPIC | Buck | Boost, Charge Pump, Cuk, Flyback, SEPIC | Boost, Charge Pump, Cuk, Flyback, SEPIC | 
| Output Type | Adjustable | Adjustable | Adjustable | Adjustable | 
| Number of Outputs | 1 | 1 | 1 | 1 | 
| Voltage - Input (Min) | 2.5V | 3.6V | 2.5V | 2.5V | 
| Voltage - Input (Max) | 22V | 34V | 22V | 22V | 
| Voltage - Output (Min/Fixed) | 1.215V | 1.265V | 1.215V | 1.215V | 
| Voltage - Output (Max) | 42V (Switch) | 20V | 42V (Switch) | 42V (Switch) | 
| Current - Output | 3.3A (Switch) | 2A | 3.3A (Switch) | 3.3A (Switch) | 
| Frequency - Switching | 200kHz ~ 2.5MHz | 300kHz ~ 2.8MHz | 200kHz ~ 2.5MHz | 200kHz ~ 2.5MHz | 
| Synchronous Rectifier | No | No | No | No | 
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TJ) | -40°C ~ 150°C (TJ) | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 14-WFDFN Exposed Pad | 14-WFDFN Exposed Pad | 14-WFDFN Exposed Pad | 14-WFDFN Exposed Pad | 
| Supplier Device Package | 14-DFN (4x3) | 14-DFN (4x3) | 14-DFN (4x3) | 14-DFN (4x3) |