| PartNumber | FAN5904BUC01X | FAN5903BUCX | FAN5903UCX |
| Description | Switching Voltage Regulators Buck Converter with Bypass Mode | Switching Voltage Regulators Buck Converter with Bypass Mode | Switching Voltage Regulators Buck Converter 3G/3.5G and 4G PAs |
| Manufacturer | ON Semiconductor | ON Semiconductor | ON Semiconductor |
| Product Category | Switching Voltage Regulators | Switching Voltage Regulators | Switching Voltage Regulators |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | WLCSP-16 | WLCSP-9 | WLCSP-12 |
| Output Voltage | 400 mV | 400 mV | 400 mV to 3.5 V |
| Output Current | 2.3 A | 2.4 A | 2.4 A |
| Number of Outputs | 2 Output | 1 Output | - |
| Input Voltage MAX | 5.5 V | 5.5 V | 5.5 V |
| Topology | Buck | Buck | Buck |
| Input Voltage MIN | 2.7 V | 2.7 V | - |
| Switching Frequency | 6 MHz | 6 MHz | 3 MHz, 6 MHz |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Series | FAN5904 | FAN5903 | FAN5903 |
| Packaging | Reel | Reel | Reel |
| Function | Buck | Buck | - |
| Operating Temperature Range | - 40 C to + 85 C | - 40 C to + 85 C | - |
| Product | Voltage Regulators | Voltage Regulators | - |
| Type | Buck Converter | Buck Converter | Voltage Converter |
| Brand | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild | ON Semiconductor / Fairchild |
| Shutdown | Shutdown | Shutdown | - |
| Load Regulation | +/- 25 mV | +/- 25 mV | - |
| Product Type | Switching Voltage Regulators | Switching Voltage Regulators | Switching Voltage Regulators |
| Factory Pack Quantity | 3000 | 3000 | 3000 |
| Subcategory | PMIC - Power Management ICs | PMIC - Power Management ICs | PMIC - Power Management ICs |
| Supply Voltage Min | 2.7 V | 2.7 V | - |
| Unit Weight | 0.001658 oz | 0.002328 oz | 0.002328 oz |
| Operating Supply Current | - | 70 uA | - |