DESCRIPTION
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

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

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

Support up to 3A Charge Current

8-Lead SOP and 10-Lead TDFN Packages

RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS

Small Notebook Computer

Portable DVD

Handheld Instruments

 

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