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| Part Number | LTC3126EUFD | LTC3126IUFD | 
|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | 
| Product Status | Obsolete | Obsolete | 
| Function | Step-Down | Step-Down | 
| Output Configuration | Positive | Positive | 
| Topology | Buck | Buck | 
| Output Type | Adjustable | Adjustable | 
| Number of Outputs | 1 | 1 | 
| Voltage - Input (Min) | 2.4V | 2.4V | 
| Voltage - Input (Max) | 42V | 42V | 
| Voltage - Output (Min/Fixed) | 0.818V | 0.818V | 
| Voltage - Output (Max) | 42V | 42V | 
| Current - Output | 2.5A | 2.5A | 
| Frequency - Switching | 200kHz ~ 2.2MHz | 200kHz ~ 2.2MHz | 
| Synchronous Rectifier | Yes | Yes | 
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 28-WFQFN Exposed Pad | 28-WFQFN Exposed Pad | 
| Supplier Device Package | 28-QFN (4x5) | 28-QFN (4x5) |