EUP8209-Switch Mode Li-Ion/Polymer Battery Charger  DataSheet 

DESCRIPTION
    The EUP8209 is a constant current, constant voltage Li-Ion battery charger controller that uses a current mode PWM step-down (buck) switching architecture. With a 500kHz switching frequency, the EUP8209 provides a small, simple and efficient solution to fast charge one (4.2V) or two (8.4V) cell lithium-ion batteries.
    The EUP8209 charges the battery in three phases:conditioning, constant current, and constant voltage. Anexternal sense resistor sets the charge current with ±10% accuracy. An internal resistor divider and precision reference set the final float voltage to 4.2V per cell with ± 1% accuracy. An internal comparator detects the near end-of-charge condition while an internal timer sets the total charge time and terminates the charge cycle. The EUP8209 automatically re-starts the charge if the battery voltage falls below an internal threshold, 4.05V per cell.
    The EUP8209 also automatically enters sleep mode when DC supplies are removed.The EUP8209 is available in the 8-lead SOP package.

FEATURES
 Wide Input Supply Voltage Range:
    4.8V to 20V – 4.2 Version
    8.9V to 20V – 8.4 Version
    8.9V to 20V – 8.4A Version
 500kHz Switching Frequency
 End-of-Charge Current Detection Output
 12 Hour Charge Termination Timer
 ±1% Charge Voltage Accuracy
 ±10% Charge Current Accuracy
 Low 10μA Reverse Battery Drain Current
 Automatic Battery Recharge
 Automatic Trickle Charging of Low Voltage Batteries
 Automatic Sleep Mode for Low Power Consumption
 Battery Temperature Sensing
 Stable with Ceramic Output Capacitor
 Support up to 3A Charge Current
 8-Lead SOP Package
 RoHS Compliant and 100% Lead (Pb)-Free Halogen-Free

APPLICATIONS
 Small Notebook Computer
 Portable DVD
 Handheld Instruments