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| Part Number | FAN53555UC01X | FAN53555UC08X | FAN53555UC09X | FAN53555UC05X | FAN53555UC03X | FAN53555UC04X | FAN53555UC00X | 
|---|---|---|---|---|---|---|---|
| Manufacturer | Fairchild Semiconductor | Fairchild Semiconductor | Fairchild Semiconductor | Fairchild Semiconductor | onsemi | onsemi | Fairchild Semiconductor | 
| Product Status | Active | Active | Active | Active | Active | Active | Active | 
| Function | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | 
| Output Configuration | Positive | Positive | Positive | Positive | Positive | Positive | Positive | 
| Topology | Buck | Buck | Buck | Buck | Buck | Buck | Buck | 
| Output Type | Programmable | Programmable | Programmable | Programmable | Programmable | Programmable | Programmable | 
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 
| Voltage - Input (Min) | 2.5V | 2.5V | 2.5V | 2.5V | 2.5V | 2.5V | 2.5V | 
| Voltage - Input (Max) | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V | 
| Voltage - Output (Min/Fixed) | 0.6V | 0.6V | 0.603V | 0.6V | 0.6V | 0.603V | 0.6V | 
| Voltage - Output (Max) | 1.23V | 1.23V | 1.41V | 1.23V | 1.23V | 1.41V | 1.23V | 
| Current - Output | 5A | 4A | 5A | 5A | 5A | 5A | 5A | 
| Frequency - Switching | 2.4MHz | 2.4MHz | 2.4MHz | 2.4MHz | 2.4MHz | 2.4MHz | 2.4MHz | 
| Synchronous Rectifier | Yes | Yes | Yes | Yes | Yes | Yes | Yes | 
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 20-UFBGA, WLCSP | 20-UFBGA, WLCSP | 20-UFBGA, WLCSP | 20-UFBGA, WLCSP | 20-UFBGA, WLCSP | 20-UFBGA, WLCSP | 20-UFBGA, WLCSP | 
| Supplier Device Package | 20-WLCSP (1.96x1.56) | 20-WLCSP (1.96x1.56) | 20-WLCSP (1.96x1.56) | 20-WLCSP (1.96x1.56) | 20-WLCSP (1.96x1.56) | 20-WLCSP (1.96x1.56) | 20-WLCSP (1.96x1.56) |