Rev.1.4
_00
BATTERY PROTECTION IC
FOR 2-SERIAL-CELL PACK
S-8242B Series
The S-8242B Series are protection ICs for 2-serial-cell
lithium-ion/lithium polymer rechargeable batteries and
include high-accuracy voltage detectors and delay circuits.
These ICs are suitable for protecting 2-cell rechargeable
lithium-ion / lithium polymer battery packs from overcharge,
overdischarge, and overcurrent.
Features
High-accuracy voltage detection for each cell
•
Overcharge detection voltage n (n
=
1, 2)
3.9 V to 4.5 V (50 mV steps)
Accuracy
±25
mV
*1
•
Overcharge release voltage n (n
=
1, 2)
3.8 V to 4.5 V
Accuracy
±50
mV
•
Overdischarge detection voltage n (n
=
1, 2)
2.0 V to 3.0 V (100 mV steps)
Accuracy
±50
mV
*2
Accuracy
±100
mV
•
Overdischarge release voltage n (n
=
1, 2)
2.0 V to 3.4 V
*1.
Overcharge release voltage
=
Overcharge detection voltage
−
Overcharge hysteresis voltage
(Overcharge hysteresis voltage n (n
=
1, 2) can be selected as 0 V or from a range of 0.1 V to
0.4 V in 50 mV steps.)
*2.
Overdischarge release voltage
=
Overdischarge detection voltage
+
Overdischarge hysteresis voltage
(Overdischarge hysteresis voltage n (n
=
1, 2) can be selected as 0 V or from a range of 0.1 V to
0.7 V in 100 mV steps.)
(2) Two-level overcurrent detection (overcurrent 1, overcurrent 2)
•
Overcurrent detection voltage 1
0.05 V, 0.08 V to 0.30 V (10 mV steps)
Accuracy
±15
mV
•
Overcurrent detection voltage 2
1.2 V (fixed)
Accuracy
±300
mV
(3) Delay times (overcharge, overdischarge, overcurrent) are generated by an internal circuit (external capacitors are
unnecessary).
(4) 0 V battery charge function available/unavailable are selectable.
(5) Charger detection function
•
The overdischarge hysteresis is released by detecting negative voltage at the VM pin (−0.7 V typ.) (Charger
detection function).
(6) High-withstanding-voltage devices
Absolute maximum rating: 28 V
(7) Wide operating temperature range
−40°C
to
+85 °C
(8) Low current consumption
Operation mode
10
µA
max. (+25°C)
Power-down mode
0.1
µA
max. (+25°C)
(9) Small package
SNT-8A, 8-Pin TSSOP
(10) Lead-free products
(1)
Applications
•
Lithium-ion rechargeable battery packs
•
Lithium polymer rechargeable battery packs
Packages
Package Name
SNT-8A
8-Pin TSSOP
Package
PH008-A
FT008-A
Drawing Code
Tape
PH008-A
FT008-E
Reel
PH008-A
FT008-E
Land
PH008-A
Seiko Instruments Inc.
1
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8242B Series
Block Diagram
Rev.1.4
_00
DO
Delay circuit, controller,
0 V battery charge/
charge inhibition circuit
−
+
+
−
VDD
CO
+
−
+
−
VC
−
+
+
−
300 kΩ
VM
10 kΩ
Charger
detector
VSS
Remark
All the diodes in the figure are parasitic diodes.
Figure 1
2
Seiko Instruments Inc.
Rev.1.4
_00
Product Name Structure
1. Product Name
S-8242B
xx
-
xxxx
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8242B Series
G
Package name (abbreviation) and IC packing specifications
*1
I8T1: SNT-8A, Tape
T8T1: 8-Pin TSSOP, Tape
Serial code
Sequentially set from AA to ZZ
*1.
Refer to the taping drawing.
2. Product Name List
(1) SNT-8A Package
Table 1
Overcharge
Detection
Voltage
(V
CU
)
4.325 V
4.350 V
4.430 V
4.300 V
4.300 V
4.350 V
4.350 V
4.350 V
4.300 V
4.300 V
4.350 V
4.350 V
4.300 V
4.210 V
4.190 V
4.350 V
4.270 V
Overcharge
Release
Voltage
(V
CL
)
4.075 V
4.350 V
4.200 V
4.100 V
4.100 V
4.150 V
4.150 V
4.150 V
4.100 V
4.100 V
4.150 V
4.150 V
4.100 V
4.210 V
4.190 V
4.150 V
4.070 V
Overdischarge
Detection
Voltage
(V
DL
)
2.2 V
2.3 V
2.3 V
2.4 V
2.6 V
2.3 V
2.3 V
2.3 V
2.6 V
2.4 V
2.2 V
2.2 V
2.4 V
2.0 V
2.3 V
3.0 V
2.3 V
Overdischarge
Release
Voltage
(V
DU
)
2.9 V
2.9 V
2.9 V
3.0 V
3.0 V
2.9 V
2.9 V
2.9 V
3.0 V
3.0 V
2.9 V
2.9 V
3.0 V
2.0 V
2.9 V
3.4 V
2.3 V
Overcurrent
Detection
Voltage 1
(V
IOV1
)
0.21 V
0.08 V
0.08 V
0.20 V
0.28 V
0.25 V
0.10 V
0.20 V
0.21 V
0.28 V
0.20 V
0.25 V
0.21 V
0.20 V
0.10 V
0.25 V
0.20 V
0 V Battery
Charge
Unavailable
Available
Available
Unavailable
Unavailable
Unavailable
Available
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Available
Unavailable
Available
Product Name / Item
S-8242BAB-I8T1G
S-8242BAD-I8T1G
S-8242BAE-I8T1G
S-8242BAH-I8T1G
S-8242BAM-I8T1G
S-8242BAN-I8T1G
S-8242BAO-I8T1G
S-8242BAQ-I8T1G
S-8242BAR-I8T1G
S-8242BAU-I8T1G
S-8242BAV-I8T1G
S-8242BAW-I8T1G
S-8242BAX-I8T1G
S-8242BAY-I8T1G
S-8242BAZ-I8T1G
S-8242BBA-I8T1G
S-8242BBB-I8T1G
Remark
Please contact our sales office for the products with detection voltage value other than those specified above.
(2) 8-Pin TSSOP Package
Table 2
Overcharge
Detection
Voltage
(V
CU
)
4.350 V
4.300 V
4.250 V
4.100 V
4.300 V
Overcharge
Release
Voltage
(V
CL
)
4.150 V
4.100 V
4.050 V
3.800 V
4.100 V
Overdischarge
Detection
Voltage
(V
DL
)
2.3 V
2.4 V
2.4 V
2.2 V
2.6 V
Overdischarge
Release
Voltage
(V
DU
)
3.0 V
3.0 V
3.0 V
2.4 V
3.0 V
Overcurrent
Detection
Voltage 1
(V
IOV1
)
0.30 V
0.20 V
0.15 V
0.30 V
0.21 V
0 V Battery
Charge
Available
Unavailable
Available
Unavailable
Unavailable
Product Name / Item
S-8242BAC-T8T1G
S-8242BAH-T8T1G
S-8242BAI-T8T1G
S-8242BAP-T8T1G
S-8242BAR-T8T1G
Remark
Please contact our sales office for the products with detection voltage value other than those specified above.
Seiko Instruments Inc.
3
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8242B Series
Pin Configurations
Table 3
SNT-8A
Top view
1
2
3
4
8
7
6
5
Rev.1.4
_00
Pin No.
1
Symbol
CO
Description
Figure 2
Connection of charge control FET gate
(CMOS output)
Connection of discharge control FET gate
2
DO
(CMOS output)
*1
NC
3
No connection
Connection for negative power supply input
4
VSS
and negative voltage of battery 2
Connection for negative voltage of battery 1
5
VC
and positive voltage of battery 2
Connection for positive power supply input
6
VDD
and positive voltage of battery 1
*1
NC
7
No connection
Voltage detection between VM and VSS
8
VM
(overcurrent/charger detection pin)
*1.
The NC pin is electrically open.
The NC pin can be connected to VDD or VSS.
Remark
For the external views, refer to the package drawings.
Table 4
8-Pin TSSOP
Top view
1
2
3
4
8
7
6
5
Pin No.
1
Symbol
CO
Description
Figure 3
Connection of charge control FET gate
(CMOS output)
Connection of discharge control FET gate
2
DO
(CMOS output)
*1
NC
3
No connection
Connection for negative power supply input
4
VSS
and negative voltage of battery 2
Connection for negative voltage of battery 1
5
VC
and positive voltage of battery 2
Connection for positive power supply input
6
VDD
and positive voltage of battery 1
*1
NC
7
No connection
Voltage detection between VM and VSS
8
VM
(overcurrent/charger detection pin)
*1.
The NC pin is electrically open.
The NC pin can be connected to VDD or VSS.
Remark
For the external views, refer to the package drawings.
4
Seiko Instruments Inc.
Rev.1.4
_00
Absolute Maximum Ratings
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8242B Series
Table 5
(Ta=25°C unless otherwise specified)
Item
Input voltage between VDD and VSS
VC input pin voltage
VM pin input voltage
DO pin output voltage
CO pin output voltage
SNT-8A
8-Pin TSSOP
Operating ambient temperature
Power dissipation
Storage temperature
Symbol
V
DS
V
VC
V
VM
V
DO
V
CO
P
D
T
opr
T
stg
Applied pin
VDD
VC
VM
DO
CO
Absolute Maximum Ratings
V
SS
−0.3
to V
SS
+12
V
SS
−0.3
to V
DD
+0.3
V
DD
−28
to V
DD
+0.3
V
SS
−0.3
to V
DD
+0.3
V
VM
−0.3
to V
DD
+0.3
450
*1
700
*1
−40
to
+85
−55
to
+125
Unit
V
V
V
V
V
mW
mW
°C
°C
*1.
When mounted on board
[Mounted board]
(1) Board size: 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name: JEDEC STANDARD51-7
Caution
The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
800
Power Dissipation (P
D
) [mW]
600
8-Pin TSSOP
400
200
SNT-8A
100
150
50
Ambient Temperature (Ta) [°C]
0
0
Figure 4 Power Dissipation of Package (When mounted on board)
Seiko Instruments Inc.
5
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