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Switch Mode Li-Ion/Polymer Battery Charger


The EUP8207 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 EUP8207 provides a small, simple and efficient solution to fast charge one (4.2V) or two (8.4V) cell lithium-ion batteries.

The EUP8207 charges the battery in three phases: conditioning, constant current, and constant voltage. An external 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 EUP8207 automatically re-starts the charge if the battery

voltage falls below an internal threshold, 4.05V per cell. The EUP8207 also automatically enters sleep mode when DC supplies are removed.

The EUP8207 is available in the 8-lead SOP and 10-lead TDFN packages.


  • • 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
  • • 7 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
  • • 8-Lead SOP and 10-Lead TDFN Packages
  • • RoHS Compliant and 100% Lead (Pb)-Free


  • • Small Notebook Computer
  • • Portable DVD
  • • Handheld Instruments
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