SS6821
Single-Cell Lithium-Ion Battery Protection IC
FEATURES
Reduction in board size with miniature SOT-23-5
package and few external components.
Ultra-low quiescent current of 7µA (V
CC
=3.5V).
Ultra-low power-down current of 0.6
µ
A (V
CC
=2.2V).
Precision over-charge protection voltage
4.35V
±
50mV for the SS6821A
4.30V
±
50mV for the SS6821B
4.25V
±
50mV for the SS6821C
4.20V
±
50mV for the SS6821D
Built-in delay-time circuits for over-charge, over-
discharge, and over-current protection.
Load detection function during overcharge mode.
Two detection levels for over-current protection.
DESCRIPTION
The SS6821 battery protection IC is
designed to protect a lithium-ion battery from
damage or reduced lifetime due to over-charge,
over-discharge, and/or over-current in single-cell
lithium-ion battery powered systems, such as
cellular phones. The ultra-small package and
few external components make the SS6821
ideal for integration into the limited space of
of a battery pack.
The accurate
±50mV
over-charging detection
voltage ensures safe and full-utilization
charging. Four different specification values for
over-charge protection voltage are provided for
various protection requirements. The very low
standby current drains little current from the cell
while in storage.
APPLICATIONS
Protection IC for single-cell Lithium-Ion battery
packs.
TYPICAL APPLICATION CIRCUIT
FUSE
BATT+
R1
BATTERY
100
C1
0.1µF
5
VCC
CS
4
2
3
GND
OD
OC
1
R3
R2
100K
M1
SSM9926
SS6821
10M
BATT-
M2 SSM9926
Protection Circuit for Single-Cell Lithium-Ion Battery
12/6/2004 Rev.2.02
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SS6821
ORDERING INFORMATION
SS6821-XCXXX
Packing:
TR: Tape and reel
SOT-23-5
TOP VIEW
VCC
5
CS
4
PIN CONFIGURATION
Package type
V: SOT-23-5
Overcharge protection:
A: 4.35V
B: 4.30V
C: 4.25V
D: 4.20V
Example: SS6821-A CVTR
à
4.35V version, in SOT-23-5 package
shipped in tape and reel
1
OC
2
GND
3
OD
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
....................................…………………....................................................
18V
DC Voltage Applied on other Pins
...............…………………………..............................
18V
Charger Voltage
..............……………………….……………………................................
14V
Operating Temperature Range
.....................................………………..............
-40°C~85°C
Storage Temperature Range
.........................………………….....................
- 65°C~125°C
TEST CIRCUIT
I
CC
R1
V
CC
100
C1
0.1µF
2
V
OD
3
GND
OD
OC
1
R3
10M
V
OC
5
VCC
CS
4
R2
V
CS
100K
SS6821
12/6/2004 Rev.2.02
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SS6821
ELECTRICAL CHARACTERISTICS
PARAMETER
Supply Current
Power-Down Current
Over-charge Protection Voltage
(Ta=25°C, unless otherwise specified.)
MIN.
TYP.
7
0.6
4.30
4.25
V
OCP
4.20
4.15
V
HYS
230
4.35
4.30
4.25
4.20
300
TEST CONDITIONS
SYMBOL
V
CC
=3.5V
V
CC
=2.2V,
SS6821A
SS6821B
SS6821C
SS6821D
I
CC
I
PD
MAX.
11
1.0
4.40
4.35
UNIT
µA
µA
V
4.30
4.25
370
mV
Over-charge Hysteresis
Voltage
Over-discharge Protection
Voltage
Over-discharge Release
Voltage
Over-current Protection
Voltage
Over-charge Delay Time
V
CC
=3.5V
V
ODP
2.25
2.4
2.55
V
V
ODR
2.85
3.0
3.15
V
V
OIP
180
200
220
mV
V
CC
=V
OCP
-0.1→
V
OCP
+ 0.1V
T
OC
100
150
200
ms
Over-discharge Delay Time
Over-current Delay Time (1)
V
CC
= 2.6V
→
2.2V
V
CC
=3.5V,
1V>V
CS
>0.2V
V
CC
=3.5V, V
CS
>1V
T
OD
T
OI1
6
6
12
12
18
18
50
ms
ms
µs
V
Over-current Delay Time (2)
OD Pin Output “H” Voltage
OD Pin Output “L” Voltage
Load Detection Threshold
Voltage
Charge Detection Threshold
Voltage
T
OI2
V
DH
V
DL
V
CC
-0.2 V
CC
-0.02
0.01
0.3
0.1
0.4
V
V
V
CC
=V
OCP
– 50mV
V
LD
V
CC
=2.4V
V
CH
-0.45
-0.3
V
12/6/2004 Rev.2.02
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SS6821
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs. Supply Voltage
8.0
10
Supply Current vs. Temperature
Vcc=3.5V
Ta=25°C
9
Supply Current (
µ
A)
Supply Current (
µ
A)
7.6
8
7.2
7
6.8
6
6.4
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
5
-40
-20
0
20
40
60
80
Supply Voltage (V)
Temperature (°C)
Power-Down Current vs. Temperature
0.66
Overcharge Protection Voltage vs. Temperature
4.36
Vcc=2.2V
Power-Down Current (
µ
A)
0.63
Overcharge Protection Voltage (V)
4.34
SS6821B
4.32
0.60
4.30
4.28
0.57
4.26
0.54
-40
-20
0
20
40
60
80
4.24
-40
-20
0
20
40
60
80
Temperature (°C)
Overdischarge Protection Voltage vs. Temperature
Overdischarge Protection Voltage (V)
2.42
202
Temperature (°C)
Overcurrent Protection Voltage vs. Temperature
Overcurrent Protection Voltage (mV)
Vcc=3.5V
201
2.41
2.40
200
2.39
199
2.38
-40
-20
0
20
40
60
80
198
-40
-20
0
Temperature (°C)
Temperature (
°C)
20
40
60
80
12/6/2004 Rev.2.02
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SS6821
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
Overcharge Release Voltage vs. Temperature
4.10
3.10
Overdischarge Release Voltage vs. Temperature
Overdischarge Release Voltage (V)
80
Overcharge Release Voltage (V)
SS6821B
4.05
3.05
4.00
3.00
3.95
2.95
3.90
-40
-20
0
20
40
60
Temperature (
°C)
2.90
-40
-20
0
20
40
60
80
Temperature (
°C)
Overcharge Delay Time vs. Temperature
145
12
Overdischarge Delay Time vs. Temperature
Overdischarge Delay Time (mS)
Overcharge Delay Time (mS)
140
11
135
10
130
9
125
-40
-20
0
20
40
60
80
8
-40
-20
0
20
40
60
80
Temperature (°C)
Temperature (°C)
Overcurrent Delay Time 1 vs. Temperature
12
Overcurrent Delay Time 1(mS)
Vcc=3.5V
11
10
9
8
-40
-20
0
20
40
60
80
Temperature (°C)
12/6/2004 Rev.2.02
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