Battery Charger Li-Ion 300mA 5.05V 30-Pin WLCSP T/R

The FAN54300 combines two highly integrated switch-mode chargers and a boost regulator to minimize single-cell Li-Ion charging time from a USB and/or auxiliary power source. Charging parameters and operating modes are programmable through an I2C Bus interface that operates up to 3.4 Mbps. The charger and boost regulator circuits switch at 3 MHz to minimize the size of the external passive components. The FAN54300 provides battery charging in three phases: conditioning, constant current, and constant voltage. To ensure USB compliance and minimize charging time, the USB input current is limited to the value set through the I2C host. Charge termination is determined by a programmable minimum current level. A safety timer with reset control provides a safety backup for the I2C host. The 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, with leakage from the battery to the input prevented. Charge status is reported back to the host through the I2C port. Charge current is reduced when the die temperature reaches 120°C. The FAN54300 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. The FAN54300 is available in a 30-bump, 0.4 mm pitch, wafer-level, chip-scale package (WLCSP).

• Fully Integrated, High-Efficiency Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs
• Accepts USB or Dedicated Power Input Source
• 5 V, 300 mA Boost Mode for USB OTG from 2.5 to 4.5 V Battery Input
• Charge Voltage Accuracy: ?0.5% at TA=25°C
  • 1% from TA=0 to 125°C
• 5% USB Input Current Regulation Accuracy
• 5% Charge Current Regulation Accuracy
• 20 V Absolute Maximum Input Voltage
• 9.5 V Maximum Input Operating Voltage on VIN Pin,
• 6.5 V Maximum on VBUS Pin
• Up to 1.5 A Maximum Charge Rate
• Programmable Charge and Mode through High-Speed I 2C Interface (3.4 Mb/s) with Fast Mode Plus Compatibility
  • Input Current
  • Fast-Charge / Termination Current
  • Charger Voltage
  • Safety Timer
  • Termination Enable
• 3 MHz Synchronous Buck PWM Controller with Wide Duty Cycle Range
• Small Footprint, 1 ?H, External Inductors
• Safety Timer with Reset Control
• Weak Input Sources Accommodated by Reducing Charging Current to Maintain Minimum VBUS Voltage
• Low Reverse Leakage from Battery Drain to VBUS or VIN
• Programmable LED Drive for Charge Indication
• Register and Slave Addresses Compatible with FAN540X and FAN542X Families