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| Part Number | FAN54040UCX | 
| Datasheet | FAN54040UCX datasheet | 
| Description | IC USB SW CHARGER LI-ION 25WLCSP | 
| Manufacturer | ON Semiconductor | 
| Series | - | 
| Part Status | Obsolete | 
| Battery Chemistry | Lithium-Ion/Polymer | 
| Number of Cells | 1 | 
| Current - Charging | Constant - Programmable | 
| Programmable Features | Current, Timer, Voltage | 
| Fault Protection | Over Temperature, Over Voltage, Short Circuit | 
| Charge Current - Max | 1.55A | 
| Battery Pack Voltage | 4.2V | 
| Voltage - Supply (Max) | 6V | 
| Interface | I²C | 
| Operating Temperature | -30°C ~ 85°C (TA) | 
| Package / Case | Surface Mount | 
| Supplier Device Package | 20-UFBGA, WLCSP | 
| Base Part Number | 20-WLCSP (1.96x1.56) |