EUP8202-4.2/8.4
Switch Mode Li-Ion/Polymer
Battery Charger
DESCRIPTION
The EUP8202 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 EUP8202 provides a
small, simple and efficient solution to fast charge one
(4.2V) or two (8.4V) cell lithium-ion batteries.
The EUP8202 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
EUP8202 automatically re-starts the charge if the battery
voltage falls below an internal threshold, 4.05V per cell.
The EUP8202 also automatically enters sleep mode when
DC supplies are removed.
The EUP8202 is available in the 8-lead SOP and 10-lead
TDFN packages.
FEATURES
Wide Input Supply Voltage Range:
4.7V to 20V – 4.2 Version
8.9V to 20V – 8.4 Version
500kHz Switching Frequency
End-of-Charge Current Detection Output
3 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
APPLICATIONS
Small Notebook Computer
Portable DVD
Handheld Instruments
Typical Operating Performance
Efficiency vs Input voltage
100
Efficiency vs Input voltage
100
(Curves include input diode)
95
90
(Curves include input diode)
95
90
EFFICIENCY(%)
85
80
75
70
65
60
8
10
12
14
16
18
20
EFFICIENCY(%)
EUP8202-8.4
VBAT=7.0V
VBAT=8.0V
85
80
75
70
65
60
5
10
15
20
EUP8202-4.2
VBAT=3.8V
VBAT=4.0V
Input Voltage (V)
Input Voltage (V)
DS8202 Ver 1.1 Nov.2007
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
