onsemi FAN54005UCX

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 program− mable through an I²C Interface that operates up to 3.4 Mbps The FAN54005 provides battery charging in three phases: conditioning, constant current and constant voltage. To ensure USB compliance and minimize charging time, the input current limit can be changed through the I²C interface by the host processor. Charge termination is determined by a programmable minimum current level. A safety timer with reset control provides a safety backup for the I²C host. Charge status is reported to the host through the I²C port. The integrated circuit (IC) automatically restarts the charge cycle when the battery falls below an internal threshold. If the input source is removed, the IC enters a high−impedance mode, preventing leakage from the battery to the input. Charge current is reduced when the die temperature reaches 120°Cᵢ, protecting the device and PCB from damage. The FAN54005 can operate as a boost regulator on command from the system. The boost regulator includes a soft−start that limits inrush current from the battery and uses the same external components used for charging the battery.

• 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 μH 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

• Wireless Speakers, Headphones
• Cell Phones, Gaming Devices
• Toys, Drones, Digital Cameras
• IoT Devices
• E−Cigs, Vapes