Description
   The FAN54005 is a highly integrated switch−mode charger, configurable for 200 mA to 1.45 A systems using a single external resistor.
   The charging parameters and operating modes are programmable through an I2C Interface that operates up to 3.4 Mbps. The charger and boost regulator circuits switch at 3 MHz to minimize the size of external passive components.
   The FAN54005 provides battery charging in three phases: conditioning, constant current and constant voltage.

FEATUREs
• Fully Integrated, High−Efficiency Charger for
   Single−Cell Li−Ion and Li−Polymer Battery Packs
• Charge Voltage Accuracy: ±0.5% at 25°C
                                                ±1% from 0 to 125°C
• Supports 200 mA to 1.45 A Systems
   95% Efficiency for 200 mA−Hour Batteries
   94% Efficiency for 500 mA−Hour Batteries
   90% Efficiency for 1.0 A−Hour Batteries
• ±5% Input Current Regulation Accuracy
• ±5% Charge Current Regulation Accuracy
• 20 V Absolute Maximum Input Voltage
• 6 V Maximum Input Operating Voltage
• Charge Parameters Programmable through High−Speed
   I2C Interface (3.4 Mb/s) with Fast Mode Plus
   Compatibility
   ♦ Input Current
   ♦ Fast−Charge / Termination Current
   ♦ Charger Voltage
   ♦ Termination Enable
• 3 MHz Synchronous Buck PWM Controller with Wide
   Duty Cycle Range
• Small Footprint 1 H External Inductor
• Safety Timer with Reset Control
• 1.8 V Regulated Output from VBUS for Auxiliary Circuits
• Dynamic Input Voltage Control Automatically Reduces
   Charging Current with Weak Input Sources
• Low Reverse Leakage to Prevent Battery Drain to VBUS
• 5 V, 500 mA Boost Mode for USB OTG for 3.0 V to
   4.5 V Battery Input
• Available in a 1.96 x 1.87 mm, 20−bump, 0.4 mm Pitch
   WLCSP Package