FAN54300 Datasheet | Fairchild Semiconductor

Features - 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 m A 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 I2C Interface (3.4 Mb/s) with Fast Mode Plus patibility - 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 Acmodated 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 patible with FAN540X and FAN542X Families Description The FAN54300 bines 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 ponents. The FAN54300 provides battery charging in three phases: conditioning, constant current, and constant voltage. To ensure USB pliance 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...