Rev.3.3
_00
BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK
(SECONDARY PROTECTION)
S-8244 Series
The S-8244 Series is used for secondary protection of lithium-ion
batteries with from one to four cells, and incorporates a high-
precision voltage detector circuit and a delay circuit. Short-circuits
between cells accommodate series connection of one to four cells.
Features
(1) Internal high-precision voltage detector circuit
•
Overcharge detection voltage range :
3.70 to 4.50 V :
Accuracy of ± 25 mV (at +25
°C)
(at a 5 mV/step)
Accuracy of ± 50 mV (at -40 to +85
°C)
•
Hysteresis :
5 optional models available and selectable:
0.38±0.1 V, 0.25±0.07 V, 0.13±0.04 V, 0.045±0.02 V, None
(2) High withstand voltage device :
Absolute maximum rating : 26 V
(3) Wide operating voltage range :
3.6 V to 24 V (refers to the range in which the delay circuit can
operate normally after overvoltage is detected)
(4) Delay time during detection :
Can be set by an external capacitor.
(5) Low current consumption :
At 3.5 V for each cell :
3.0
µA
max. (+25
°C)
At 2.3 V for each cell :
2.4
µA
max. (+25
°C)
(6) Output logic and form :
4 types
CMOS output active “H”
CMOS output active “L”
Pch open drain output active “L”
Nch open drain output active “H”
(only CMOS output for 0.045 V hysteresis models)
(7) Lead-free products
Applications
•
Lithium ion rechargeable battery packs (secondary protection)
Packages
Package name
SNT-8A
8-Pin MSOP
Drawing code
Package
PH008-A
FN008-A
Tape
PH008-A
FN008-A
Reel
PH008-A
FN008-A
Land
PH008-A
Seiko Instruments Inc.
1
BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
Rev.3.3
_00
S-8244 Series
Block Diagram
VCC
SENSE
Overcharge detection
comparator 1
+
-
Reference voltage 1
VC1
Overcharge detection
comparator 2
+
-
Overcharge
detection
delay circuit
ICT
Control
logic
Reference voltage 2
VC2
Overcharge detection
comparator 3
+
-
Reference voltage 3
VC3
CO
Overcharge detection
comparator 4
+
-
Reference voltage 4
VSS
Remark
In the case of Nch open-drain output, only the Nch transistor will be
connected to the CO pin. In the case of Pch open-drain output, only
the Pch transistor will be connected to the CO pin.
Figure 1
2
Seiko Instruments Inc.
BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
Rev.3.3
_00
S-8244 Series
Product Name Structure
1.
Product Name
S-8244A
xx
xx
-
xxx
xx
G
IC direction of tape specifications
*1
TF: SNT-8A
T2: 8-Pin MSOP
Product name (abbreviation)
*2
Package abbreviation
PH: SNT-8A
FN: 8-Pin MSOP
Serial code
Sequentially set from AA to ZZ
*1.
*2.
Refer to the taping specifications at the end of this book.
Refer to the
Product Name List.
Seiko Instruments Inc.
3
BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
Rev.3.3
_00
S-8244 Series
2.
Product Name List
(1) SNT-8A
Table 1
Overcharge
Overcharge
hysteresis voltage
Output form
Product name/Item
detection voltage
[V
CD
]
[V
CU
]
S-8244AAAPH-CEATFG
CMOS output active “H”
4.45
±
0.025 V
0.38
±
0.1 V
S-8244AABPH-CEBTFG
0V
Nch open drain active “H”
4.20
±
0.025 V
S-8244AAFPH-CEFTFG
CMOS output active “H”
4.35
±
0.025 V
0.045
±
0.02 V
S-8244AAGPH-CEGTFG
CMOS output active “H”
4.45
±
0.025 V
0.045
±
0.02 V
S-8244AAVPH-CEVTFG
CMOS output active “H”
4.275
±
0.025 V
0.045
±
0.02 V
S-8244AAYPH-CEYTFG
CMOS output active “H”
4.300
±
0.025 V
0.25
±
0.07 V
S-8244AAZPH-CEZTFG
CMOS output active “H”
4.280
±
0.025 V
0.25
±
0.07 V
Remark
Please contact our sales office for the products with the detection voltage value other than
those specified above.
(2) 8-Pin MSOP
Table 2
Overcharge
Overcharge
Product name/Item
detection voltage
hysteresis voltage
Output form
[V
CU
]
[V
CD
]
S-8244AAAFN-CEAT2G
CMOS output active “H”
4.45
±
0.025 V
0.38
±
0.1 V
S-8244AABFN-CEBT2G
0V
Nch open drain active “H”
4.20
±
0.025 V
S-8244AACFN-CECT2G
CMOS output active “H”
4.115
±
0.025 V
0.13
±
0.04 V
S-8244AADFN-CEDT2G
0V
Pch open drain active “L”
4.20
±
0.025 V
S-8244AAEFN-CEET2G
0V
Nch open drain active “H”
4.225
±
0.025 V
S-8244AAFFN-CEFT2G
CMOS output active “H”
4.35
±
0.025 V
0.045
±
0.02 V
S-8244AAGFN-CEGT2G
CMOS output active “H”
4.45
±
0.025 V
0.045
±
0.02 V
S-8244AAHFN-CEHT2G
CMOS output active “H”
4.30
±
0.025 V
0.25
±
0.07 V
S-8244AAIFN-CEIT2G
CMOS output active “H”
4.40
±
0.025 V
0.045
±
0.02 V
S-8244AAJFN-CEJT2G
CMOS output active “H”
4.50
±
0.025 V
0.38
±
0.1 V
CMOS output active “H”
S-8244AAKFN-CEKT2G
4.475
±
0.025 V
0.38
±
0.1 V
CMOS output active “H”
S-8244AALFN-CELT2G
4.35
±
0.025 V
0.25
±
0.07 V
CMOS output active “L”
S-8244AAMFN-CEMT2G
4.30
±
0.025 V
0.25
±
0.07 V
CMOS output active “H”
S-8244AANFN-CENT2G
4.15
±
0.025 V
0.25
±
0.07 V
CMOS output active “H”
S-8244AAOFN-CEOT2G
4.25
±
0.025 V
0.25
±
0.07 V
CMOS output active “H”
S-8244AAPFN-CEPT2G
4.05
±
0.025 V
0.25
±
0.07 V
Nch open drain active “H”
S-8244AAQFN-CEQT2G
0V
4.15
±
0.025 V
Nch open drain active “H”
S-8244AARFN-CERT2G
4.30
±
0.025 V
0.25
±
0.07 V
Remark
Please contact our sales office department for the products with the detection voltage value
other than those specified above.
4
Seiko Instruments Inc.
BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION)
Rev.3.3
_00
S-8244 Series
Pin Configurations
Table 3
SNT-8A
Top view
CO 1
ICT 2
VSS 3
VC3 4
8 VCC
7 SENSE
6 VC1
5 VC2
Pin No.
1
2
3
4
5
6
Symbol
CO
ICT
VSS
VC3
VC2
VC1
SENSE
VCC
Figure 2
7
8
Description
FET gate connection pin for charge control
Capacitor connection pin for overcharge
detection delay
Negative power input pin
Negative voltage connection pin of Battery 4
Negative voltage connection pin of Battery 3
Positive voltage connection pin of Battery 4
Negative voltage connection pin of Battery 2
Positive voltage connection pin of Battery 3
Negative voltage connection pin of Battery 1
Positive voltage connection pin of Battery 2
Positive voltage connection pin of Battery 1
Positive power input pin
Table 4
8-Pin MSOP
Top view
VCC
SENSE
VC1
VC2
1
2
3
4
8
7
6
5
CO
ICT
VSS
VC3
Pin No.
1
2
3
4
5
6
7
Symbol
VCC
SENSE
VC1
VC2
VC3
VSS
ICT
CO
Figure 3
8
Description
Positive power input pin
Positive voltage connection pin of Battery
1
Negative voltage connection pin of Battery 1
Positive voltage connection pin of Battery 2
Negative voltage connection pin of Battery 2
Positive voltage connection pin of Battery 3
Negative voltage connection pin of Battery 3
Positive voltage connection pin of Battery 4
Negative power input pin
Negative voltage connection pin of Battery 4
Capacitor connection pin for overcharge
detection delay
FET gate connection pin for charge control
Seiko Instruments Inc.
5
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