EUP8202 Datasheet, PDF (1/21 Pages) Eutech Microelectronics Inc – Switch Mode Li-Ion/Polymer Battery Charger

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
z Wide Input Supply Voltage Range:
4.7V to 20V – 4.2 Version
8.9V to 20V – 8.4 Version
z 500kHz Switching Frequency
z End-of-Charge Current Detection Output
z 3 Hour Charge Termination Timer
z 1% Charge Voltage Accuracy
z 10% Charge Current Accuracy
z Low 10µA Reverse Battery Drain Current
z Automatic Battery Recharge
z Automatic Trickle Charging of Low Voltage
Batteries
z Automatic Sleep Mode for Low Power
Consumption
z Battery Temperature Sensing
z Stable with Ceramic Output Capacitor
z 8-Lead SOP and 10-Lead TDFN Packages
z RoHS Compliant and 100% Lead (Pb)-Free
Typical Operating Performance
APPLICATIONS
z Small Notebook Computer
z Portable DVD
z Handheld Instruments
Efficiency vs Input voltage
100
(Curves include input diode)
95
90
85
80
75
70 _EUP8202-8.4
VBAT=7.0V
65
VBAT=8.0V
60
8
10
12
14
16
18
20
Input Voltage (V)
Efficiency vs Input voltage
100
(Curves include input diode)
95
90
85
80
75
70
EUP8202-4.2
65
VBAT=3.8V
VBAT=4.0V
60
5
10
15
20
Input Voltage (V)
DS8202 Ver 1.1 Nov.2007
1