S-8262A Series
www.sii-ic.com
© Seiko Instruments Inc., 2012
BATTERY PROTECTION IC
FOR 2-SERIAL-CELL PACK
Rev.1.0
_00
The S-8262A Series is a protection IC for 2-serial-cell lithium-ion / lithium polymer rechargeable batteries and includes
high-accuracy voltage detectors and delay circuits.
The S-8262A Series has an alarm signal output pin (AO pin) which outputs the alarm detection signal.
The alarm detection signal is output prior to the charge control FET signal by overcharge detection.
Features
•
High-accuracy voltage detection for each cell
Overcharge detection voltage n (n = 1, 2)
3.900 V to 4.500 V (5 mV steps) Accuracy
±20
mV (Ta =
+25°C)
Accuracy
±25
mV (Ta =
−10°C
to
+60°C)
*1
Overcharge release voltage n (n = 1, 2)
3.800 V to 4.500 V
Accuracy
±30
mV
Overdischarge detection voltage n (n = 1, 2) 2.00 V to 3.00 V (10 mV steps)
Accuracy
±50
mV
*2
Accuracy
±100
mV
Overdischarge release voltage n (n = 1, 2)
2.00 V to 3.40 V
Discharge overcurrent 1 detection voltage
0.05 V to 0.20 V (10 mV steps)
Accuracy
±10
mV
Discharge overcurrent 2 detection voltage
0.20 V to 0.40 V (20 mV steps)
Accuracy
±20
mV
Load short-circuiting detection voltage
0.70 V (fixed)
Accuracy
±100
mV
Charge overcurrent detection voltage
−0.400
V to
−0.050
V (25 mV steps) Accuracy
±20
mV
•
Detection delay times are generated only by an internal circuit (external capacitors are unnecessary).
Accuracy
±20%
•
High-withstanding-voltage device is used for charger connection pins
(VM pin and CO pin: Absolute maximum rating = 28 V)
•
0 V battery charge function "available" / "unavailable" is selectable.
•
Wide operating temperature range
Ta =
−40°C
to
+85°C
•
Low current consumption
During operation
8.0
μA
max. (Ta =
+25°C)
During power-down
0.1
μA
max. (Ta =
+25°C)
*3
•
Lead-free (Sn 100%), halogen-free
*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 0.10 V to 0.40 V in 25 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.)
*3.
Refer to "
Product Name Structure"
for details.
Applications
•
Lithium-ion rechargeable battery packs
•
Lithium polymer rechargeable battery packs
Package
•
SNT-8A
Seiko Instruments Inc.
1
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8262A Series
Block Diagram
Rev.1.0
_00
Divider control
DO
0 V battery charge
circuit or 0 V battery
charge inhibition
circuit
circuit
Oscillator
control circuit
VDD
−
+
−
+
−
+
−
+
−
+
+
−
−
+
+
−
VC
CO
500 kΩ
VM
20 kΩ
Charger
detection
circuit
VSS
DP
2.5 MΩ
AO
Remark
All diodes shown in figure are parasitic diodes.
Figure 1
2
Seiko Instruments Inc.
Rev.1.0
_00
Product Name Structure
1. Product name
S-8262A xx
-
I8T1
U
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8262A Series
Environmental code
U:
Lead-free (Sn 100%), halogen-free
Package abbreviation and IC packing specifications
*1
I8T1: SNT-8A, Tape
Serial code
*2
Sequentially set from AA to ZZ
*1.
Refer to the tape drawing.
*2.
Refer to "3.
Product name list".
2. Package
Table 1 Package Drawing Codes
Package Name
SNT-8A
Dimension
PH008-A-P-SD
Tape
PH008-A-C-SD
Reel
PH008-A-R-SD
Land
PH008-A-L-SD
3. Product name list
3. 1 SNT-8A
Table 2
Discharge
Discharge
Charge
Overcurrent 1 Overcurrent 2 Overcurrent 0 V Battery
Detection
Detection
Detection
Charge
Product Name
Voltage
Voltage
Voltage
Function
[V
DIOV2
]
[V
DIOV1
]
[V
CIOV
]
−0.100
V Available
S-8262AAA-I8T1U
4.225 V
4.100 V
2.00 V
2.00 V
0.10 V
0.30 V
−0.100
V Available
S-8262AAB-I8T1U
4.225 V
4.100 V
2.00 V
2.00 V
0.10 V
0.30 V
*1.
Refer to the
Table 3
about the details of the delay time combinations.
Overcharge
Detection
Voltage
[V
CU
]
Overcharge
Release
Voltage
[V
CL
]
Over-
discharge
Detection
Voltage
[V
DL
]
Over-
discharge
Release
Voltage
[V
DU
]
Power-down
Function
Delay Time
Combination
*1
Available
Available
(1)
(2)
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-8262A Series
Table 3 (1 / 2)
Overcharge
Detection
Delay Time
[t
CU
]
8.2 s
8.2 s
Overcharge
Release
Delay Time
[t
CL
]
2 ms
2 ms
Overcharge Alarm
Detection
Delay Time
[t
AU
]
8 ms
8 ms
Table 3 (2 / 2)
Discharge Overcurrent 1
Detection
Delay Time
[t
DIOV1
]
128 ms
64 ms
Discharge Overcurrent 2
Detection
Delay Time
[t
DIOV2
]
8 ms
4 ms
Load Short-circuiting
Detection
Delay Time
[t
SHORT
]
280
μ
s
280
μ
s
Overcharge Alarm
Release
Delay Time
[t
AL
]
128 ms
128 ms
Rev.1.0
_00
Delay Time
Combination
(1)
(2)
Overdischarge
Detection
Delay Time
[t
DL
]
128 ms
128 ms
Delay Time
Combination
(1)
(2)
Charge Overcurrent
Detection
Delay Time
[t
CIOV
]
8 ms
8 ms
Remark
The delay times can be changed within the range listed
Table 4.
For details, please contact our sales office.
Table 4
Delay Time
Overcharge detection delay time
Overcharge release delay time
Overcharge alarm detection delay time
Overcharge alarm release delay time
Overdischarge detection delay time
Discharge overcurrent 1 detection delay time
Discharge overcurrent 2 detection delay time
Load short-circuiting detection delay time
Charge overcurrent detection delay time
Symbol
t
CU
t
CL
t
AU
t
AL
t
DL
t
DIOV1
t
DIOV2
t
SHORT
t
CIOV
2.1 s
1 ms
4 ms
128 ms
*1
32 ms
64 ms
4 ms
280
μ
s
*1
4 ms
Selection Range
4.1 ms
2 ms
*1
8 ms
*1
256 ms
64 ms
128 ms
*1
8 ms
*1
500
μ
s
8 ms
*1
8.2 s
*1
4 ms
16 ms
512 ms
128 ms
*1
256 ms
16 ms
1 ms
16 ms
Remark
Select a value from the left.
Select a value from the left.
Select a value from the left.
Select a value from the left.
Select a value from the left.
Select a value from the left.
Select a value from the left.
Select a value from the left.
Select a value from the left.
*1.
This value is the delay time of the standard products.
4
Seiko Instruments Inc.
Rev.1.0
_00
Pin Configuration
1. SNT-8A
Top view
1
2
3
4
8
7
6
5
BATTERY PROTECTION IC FOR 2-SERIAL-CELL PACK
S-8262A Series
Table 5
Pin No.
1
2
Symbol
CO
DO
AO
VSS
VC
VDD
DP
VM
Description
Connection pin of charge control FET gate
(CMOS output)
Connection pin of discharge control FET gate
(CMOS output)
Overcharge alarm signal output pin
(Nch open drain output)
Input pin for negative power supply,
connection pin for negative voltage of battery 2
Connection pin for negative voltage of battery 1,
connection pin for positive voltage of battery 2
Input pin for positive power supply,
connection pin for positive voltage of battery 1
Test mode switching pin (shortening delay time)
Voltage detection pin between VM pin and VSS pin
(Overcurrent / charger detection pin)
Figure 2
3
4
5
6
7
8
Seiko Instruments Inc.
5
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