AIC1802
Two-Cell Lithium-Ion Battery Protection IC
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FEATURES
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DESCRIPTION
The AIC1802 battery protection IC is designed
to protect lithium-ion batteries from damage due
to
overcharging,
overdischarging,
and
overcurrent for two series cells in portable
phones and laptop computers. It can be a part of
the low-cost charge control system within a two-
cell lithium-ion battery pack.
Safe and full utilization charging is ensured by
the accurate
±30mV
overcharge detection.
Three
different
specification
values
for
overcharge protection voltage are provided for
various protection requirements. The very low
standby current drains little current from the
cells while in storage.
Ultra-Low Quiescent Current at 10µA (V
CC
=7V,
V
C
=3.5V).
Ultra-Low Power-Down Current at 0.2µA (V
CC
=3.8V, V
C
=1.9V).
Wide Supply Range: 2 to 18V.
Precision Overcharge Protection Voltage
4.35V
±
30mV for the AIC1802A
4.30V
±
30mV for the AIC1802B
4.25V
±
30mV for the AIC1802C
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Built-in Delay Circuits for Overcharge, Over-
discharge and Overcurrent Protection.
Overcharge and Overdischarge Delay Time
can be Extended by External Capacitors.
Built-in Cell-balancing Bleeding Network under
Overcharge Condition.
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APPLICATIONS
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Protection IC for Two-Cell Lithium-Ion Battery
Pack.
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TYPICAL APPLICATION CIRCUIT
V
BAT
+
**R1
C1
1
µ
F
C2
1
µ
F
**R2
M1
CEM9926
2 OD
AIC1802
CS
7
8
VCC
TC
5
*C
TC
6 VC
TD
3
*C
TD
4
GND
OC
1
R3
1M
Q1
R6
1K
M2
CEM9926
BATTERY 1
BATTERY 2
R4
1M
R5
C3
0.01µF 1M
V
BAT
-
*C
TC
& C
TD
are optional for delay time adjustment.
**R1 & R2: Refer application informations.
Protection Circuit for Two-Cell Lithium-Ion Battery Pack
DS-1802-03
July 13, 00
www.analog.com.tw
1
AIC1802
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ORDERING INFORMATION
AIC1802 XCX
PACKAGE TYPE
S: SOP-8
OVERCHARGE
PROTECTION VOLTAGE
A: 4.35V
B: 4.30V
C: 4.25V
ORDER NUMBER
AIC1802ACS
AIC1802BCS
AIC1802CCS
(PLASTIC SO8)
PIN CONFIGURATION
TOP VIEW
OC 1
OD 2
TD 3
GND 4
8 VC
7 CS
6 VC
5 TC
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ABSOLUTE MAXIMUM RATINGS
Supply Voltage
....................................… … … … … .....................................................
18V
18V
5V
DC Voltage Applied on VC, CS, OC, OD Pins
...............… … … … … ..............................
DC Voltage Applied on TC, TD Pins
...............… … … … … … … ..… … ..............................
Operating Temperature Range
Storage Temperature Range
.........................… … … … … … … .....................
.......................................… .… … … … ..............
-40°C~85°C
-
65°C~150°C
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TEST CIRCUIT
I
CO
1
2
3
OC
8
VCC
CS
7
VC
6
TC
5
I
CC
V
CC
V
CS
V
OD
OD
TD
I
C
V
C
4
GND
+
C
TD
AIC1802
+
C
TC
2
AIC1802
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ELECTRICAL CHARACTERISTICS
(Ta=25°C, unless otherwise specified.)
PARAMETER
Supply Current in Normal Mode
Supply Current in Power-Down
Mode
VC Pin Input Current
TEST CONDITIONS
SYMBOL
V
CC
=7V, V
C
=3.5V
V
CC
=4.8V, V
C
=2.4V
V
CC
=7V, V
C
=3.5V
AIC1802A
I
CC
I
PD
I
C
MIN.
TYP.
10
0.8
400
MAX.
15
1.2
600
4.38
4.33
4.28
4.15
2.55
3.15
165
38
UNIT
µA
µA
nA
4.32
V
OCP
4.27
4.22
V
OCR
V
ODP
V
ODR
3.85
2.25
2.85
135
12
4.35
4.30
4.25
4.0
2.4
3.0
150
25
Overcharge Protection Voltage
AIC1802B
AIC1802C
V
Overcharge Release Voltage
Overdischarge Protection
Voltage
Overdischarge Release Voltage
Overcurrent Protection Voltage
Overcharge Delay Time (1)
V
CC
=7V
V
CC
=8.6V, V
C
=4.3V,
C
TC
=0µF
V
CC
=8.6V, V
C
=4.3V,
C
TC
=0.47µF
V
CC
=4.8V, V
C
=2.4V,
C
TD
=0µF
V
CC
=4.8V, V
C
=2.4V,
C
TD
=0.47µF
V
CC
=7V, V
C
=3.5V,
V
CS
=0.15V
V
CC
=7V, V
C
=3.5V,
V
CS
=0.36V
V
CC
=8.6V, V
C
=4.3V,
OC Pin Short to GND
V
V
V
mV
mS
V
OIP
T
OC1
Overcharge Delay Time (2)
T
OC2
0.7
1.1
1.5
S
Overdischarge Delay Time (1)
T
OD1
12
25
38
mS
Overdischarge Delay Time (2)
T
OD2
0.7
1.1
1.5
S
Overcurrent Delay Time (1)
T
OI1
4
9
14
mS
Overcurrent Delay Time (2)
T
OI2
1.0
2.0
3.0
mS
OC Pin Source Current
OD Pin Output “H” Voltage
I
CO
V
DL
270
400
530
µA
V
V
CC
-0.1 V
CC
-0.02
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AIC1802
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ELECTRICAL CHARACTERISTICS
(Continued)
PARAMETER
OD Pin Output “L” Voltage
Charge Detection Threshold
Voltage
Unbalance Discharge Current
V
CC
=4.8V
TEST CONDITIONS
SYMBOL
V
DH
V
CH
MIN.
TYP.
0.01
MAX.
0.1
UNIT
V
V
-0.55
-0.4
V
CC
=8.3V, V
C
=4V
I
UD
5.4
7.7
10
mA
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TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs. Supply Voltage
10.7
Power-down Current vs. Supply Voltage
0.8
10.5
10.3
Power-Down Current (µA)
V
C
=1/2V
C C
T
A
=25
°
C
Supply Current (µA)
0.65
V
C
=1/2V
CC
T
A
=25
°
C
0.5
10.1
9.9
0.35
9.7
5.5
6.5
7.5
8.5
0.2
3.8
4.3
4.8
5.3
5.8
Supply Voltage (V)
Supply Voltage (V)
Overcharge Protection Voltage vs. Temperature
Overcurrent Protection Voltage (mV)
4.32
150
Overcurrent Protection Voltage vs. Temperature
V
CC
=7V
V
C
=3.5V
Overcharge Protection Voltage (V)
4.315
147.5
AIC1802B
4.31
145
4.305
142.5
4.3
-20
140
-20
-10
0
10
20
30
40
50
60
70
-10
0
10
Temperature (
°
C)
20
30
40
50
60
70
Temperature (
°
C)
4
AIC1802
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TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
Supply Current vs. Temperature
12.5
Power-Down Current vs. Temperature
1.1
Power-Down Current (µA)
Supply Current (µA)
V
CC
=7V
V
C
=3.5V
11.5
V
CC
=4.8V
V
C
=2.4V
0.9
10.5
0.7
9.5
8.5
-20
-10
0
10
0.5
Temperature (
°
C)
20
30
40
50
60
70
-20
-10
0
10
20
30
40
50
60
70
Temperature (
°
C)
Overdischarge Protection Voltage vs. Temperature
Overdischarge Protection Voltage
(V)
2.420
Overcharge Release Voltage vs. Temperature
4.025
2.415
2.410
2.405
2.400
2.395
-20
Overcharge Release Voltage (V)
4.020
4.015
4.010
-10
0
10
Temperature (
°
C)
20
30
40
50
60
70
4.005
-20
-10
0
10
20
30
40
50
60
70
Temperature (°C)
Overdischarge Release Voltage (V)
3.025
Overdischarge Release Voltage vs. Temperature
3.020
3.015
3.010
3.005
-20
-10
0
10
20
30
40
50
60
70
Temperature (
°
C)
5
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