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| Part Number | LTC3421EUF#PBF | LTC3521EUF#PBF | 
|---|---|---|
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | 
| Product Status | Active | Active | 
| Function | Step-Up | Step-Down, Step-Up/Step-Down | 
| Output Configuration | Positive | Positive | 
| Topology | Boost | Buck, Buck-Boost | 
| Output Type | Adjustable | Adjustable | 
| Number of Outputs | 1 | 3 | 
| Voltage - Input (Min) | 0.5V | 1.8V | 
| Voltage - Input (Max) | 4.5V | 5.5V | 
| Voltage - Output (Min/Fixed) | 2.4V | 0.6V | 
| Voltage - Output (Max) | 5.25V | 5.5V | 
| Current - Output | 1A (Switch) | 600mA, 1A | 
| Frequency - Switching | 100kHz ~ 3MHz | 1.1MHz | 
| Synchronous Rectifier | No | Yes | 
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TJ) | 
| Mounting Type | Surface Mount | Surface Mount | 
| Package / Case | 24-WFQFN Exposed Pad | 24-WFQFN Exposed Pad | 
| Supplier Device Package | 24-QFN (4x4) | 24-QFN (4x4) |