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XC6802
Series
Constant Voltage, Constant Current Linear Charger IC
for Single Cell Lithium-ion Battery Charge Control
■
GENERAL DESCRIPTION
The XC6802 series is a constant-current/constant-voltage linear charger IC for single cell lithium-ion batteries. Internally the
XC6802 series includes reference voltage source, battery voltage monitor, driver transistor, constant-current (CC)/
constant-voltage (CV) charge circuit, over heat protection circuit, phase compensation circuit, etc. The battery charge
termination voltage is internally set to 4.2V
±
0.7% and the trickle charge voltage and accuracy is 2.9V
±
3%. In trickle
charge mode, a safe charge to a battery is possible because approximately 1/10 out of setting charge current is supplied to the
battery. With an external R
SEN
resistor, the charge current can be set freely up to 800mA (MAX.), therefore, the series is ideal
for various battery charge applications. The series’ charge status output pin, /CHG pin, is capable of checking the IC’s
charging state while connecting with an external LED.
■
APPLICATIONS
●
Charging docks and stationary chargers
●
MP3 players, portable audio players
●
Cellular phones, PDAs
●
Bluetooth applications
■
FEATURES
Operating Voltage Range
: 4.25V ~ 6.0V
Charge Current
: Externally setup up to 800mA
(MAX.)
Charge Termination Voltage : 4.2V
±
0.7%
Trickle Charge Voltage
: 2.9V
±
3%
Supply Current (Stand-by) : 10
μ
A (TYP.)
Packages
: SOT-89-5, SOT-25, USP-6C
Constant-current/constant-voltage operation
with thermal regulation
Automatic recharge
Charge status output pin
Soft-start function (Inrush limit current)
■
TYPICAL APPLICATION CIRCUIT
Preliminary
ETR2501-002
■
TYPICAL PERFORMANCE
CHARACTERISTICS
●
Battery Charge Cycle
Li- io n Bat t e r y C h ar ge C yc le
0
100
200
300
400
500
600
700
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
Time (hours)
C
h
ar
ge
C
urre
nt
I
BA
T
(m
A
)
3.00
3.20
3.40
3.60
3.80
4.00
4.20
4.40
B
attery
V
o
lta
ge
V
BA
T
(V
)
VIN=5.0V, CIN=1uF
RSEN=2kohm, 830mAh Battery
Charge Current
Battery Voltage
VIN=5.0V, CIN=1uF
RSEN=2
Ω
, 830mAh Battery
Li-ion Battery Charge Cycle
Battery Voltage
Charge Current
C
h
ar
ge C
u
rr
ent :
I
BA
T
(m
A
)
Batt
er
y V
o
lta
g
e
: V
BA
T
(V
)
Time (hour)