Rev.3.8
_00
BATTERY PROTECTION IC
FOR A SINGLE CELL PACK
S-8241 Series
The S-8241 Series is a series of lithium-ion/lithium polymer rechargeable
battery protection ICs incorporating high-accuracy voltage detection
circuits and delay circuits.
These ICs are suitable for protection of single-cell lithium ion/lithium
polymer battery packs from overcharge, overdischarge and overcurrent.
Features
(1)
Internal high-accuracy voltage detection circuit
•
Overcharge detection voltage: 3.9 V to 4.4 V (5 mV-step)
Accuracy of ± 25 mV(+25°C) and ± 30 mV(−5°C to +55°C)
*1
•
Overcharge release voltage
3.8 V to 4.4 V
Accuracy of ±50 mV
*1.
Overcharge release voltage = Overcharge detection voltage - Overcharge hysteresis
The overcharge hysteresis can be selected in the range 0.0, or 0.1 to 0.4 V in 50mV steps.
(However, selection "Overcharge release voltage<3.8 V" is enabled.)
•
Overdischarge detection voltage:
•
Overdischarge release voltage:
2.0 V to 3.0 V (100 mV-step) Accuracy of ±80 mV
*2
2.0 V to 3.4 V
Accuracy of ±100 mV
*2.
Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis
The overdischarge hysteresis can be selected in the range 0.0 to 0.7 V in 100mV steps.
(However, selection "Overdischarge release voltage>3.4 V" is enabled.)
•
Overcurrent 1 detection voltage:
0.05 V to 0.3 V (5 mV-step) Accuracy of ±20 mV
•
Overcurrent 2 detection voltage:
0. 5 V (fixed) Accuracy of ±100 mV
(2) A high voltage withstand device is used for charger connection pins
(VM and CO pins: Absolute maximum rating = 26 V)
(3) Delay times (overcharge: t
CU
; overdischarge: t
DL
; overcurrent 1: t
lOV1
; overcurrent 2: t
lOV2
) are generated
by an internal circuit. (External capacitors are unnecessary.) Accuracy of ±30 %
(4) Internal three-step overcurrent detection circuit (overcurrent 1, overcurrent 2, and load short-circuiting)
(5) Either the 0 V battery charging function or 0 V battery charge inhibiting function can be selected.
(6) Products with and without a power-down function can be selected.
(7) Charger detection function and abnormal charge current detection function
•
The overdischarge hysterisis is released by detecting a negative VM pin voltage (typ. -1.3 V). (Charger
detection function)
•
If the output voltage at DO pin is high and the VM pin voltage becomes equal to or lower than the charger
detection voltage (typ. -1.3 V), the output voltage at CO pin goes low. (Abnormal charge current
detection function)
(8) Low current consumption
•
Operation:
3.0
µA
typ. 5.0
µA
max.
•
Power-down mode: 0.1
µA
max.
(9) Wide operating temperature range:
−40
to +85
°C
(10) Small package
SOT-23-5, 5-Pin SON(A)
Applications
•
Lithium-ion rechargeable battery packs
•
Lithium- polymer rechargeable battery packs
Packages
•
SOT-23-5
(PKG drawing code : MP005-A)
•
5-Pin SON(A) (PKG drawing code : PN005-A)
Seiko Instruments Inc.
1
BATTERY PROTECTION IC FOR A SINGLE CELL PACK
S-8241 Series
Block Diagram
Rev.3.8
_00
Delay circuit
Clock generation circuit
VDD
DO
Load short-
circuiting
detection circuit
Counter circuit
−
+
Overcharge
detection
comparator
Level conversion circuit
0V battery charging circuit
0V battery charge inhibition
circuit
CO
R
COL
Overdischarge
detection
comparator
+
−
The overdischarge hysterisis
is released when a charger is
detected.
Charger
detection circuit
R
VMD
+
−
Overcurrent 1
detection comparator
R
VMS
VM
+
−
Overcurrent 2
detection comparator
VSS
Remark
The diodes in the IC are parasitic diodes
Figure 1 Block Diagram
Product Code Structure
1. Product name
Product name:
S-8241AB∆
S-8241AC∆
Symbol
∆
-product code (GB∆)-taping orientation (T2 or TF)
-product code (GC∆)-taping orientation (T2 or TF)
Meaning
Serial number
Package form
Description
Is set from A to Z in sequence.
MC:SOT-23-5, PN:5-pin SON(A)
2
Seiko Instruments Inc.
BATTERY PROTECTION IC FOR A SINGLE CELL PACK
S-8241 Series
Rev.3.8
_00
Model No./Item
Over-
charge
detection
voltage
[V
CU
]
4.100 V
4.325 V
4.275 V
4.350 V
4.180 V
4.100 V
4.180 V
4.350 V
Over-
charge
release
voltage
[V
CL
]
3.850 V
4.075 V
4.175 V
4.150 V
3.930 V
4.000 V
4.080 V
4.150 V
Over-
discharge
detection
voltage
[V
DL
]
2.5 V
2.5 V
2.3 V
2.3 V
2.5 V
2.5 V
2.5 V
2.3 V
Over-
discharge
release
voltage
[V
DU
]
2.9 V
2.9 V
2.4 V
3.0 V
2.9 V
2.9 V
2.9 V
3.0 V
Over-
current 1
detection
voltage
[V
IOV1
]
0.150 V
0.150 V
0.100 V
0.100 V
0.150 V
0.150 V
0.150 V
0.200 V
0V battery
charging
function
Delay
time
combi-
*1
nation
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(2)
Power down
function
S-8241ACOMC-GCO-T2
S-8241ACPMC-GCP-T2
S-8241ACQMC-GCQ-T2
S-8241ACRMC-GCR-T2
S-8241ACSMC-GCS-T2
S-8241ACTMC-GCT-T2
S-8241ACUMC-GCU-T2
S-8241ACWMC-GCW-T2
Unavailable
Unavailable
Available
Available
Unavailable
Unavailable
Unavailable
Available
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
Unavailable
*1.
The delay time combination (1), (2), (3), (4) is as follows.
Delay time
combination
(1)
(2)
(3)
(4)
Overcharge detection
delay time
1.0 s
0.125 s
0.25 s
2.0 s
Overdischarge detection
delay time
125 ms
31 ms
125 ms
125 ms
Overcurrent 1 detection
delay time
8 ms
16 ms
8 ms
8 ms
It is possible to change the detection voltage for products other than those listed above. Also, delay time can be
changed within the following range. For details, please contact our sales office.
Delay time
Overcharge detection
delay time
Overdischarge detection
delay time
Overcurrent 1 detection
delay time
Symbol
t
CU
t
DL
t
lOV1
0.25 s
31 ms
4 ms
Optional range
0.5 s
62.5 ms
8 ms
1.0 s
125 ms
16 ms
Remarks
Choose from the list at left.
Choose from the list at left.
Choose from the list at left.
Shaded boxes indicate standard values.
4
Seiko Instruments Inc.
Rev.3.8
_00
Pin Assignment
SOT-23-5
Top view
5
4
BATTERY PROTECTION IC FOR A SINGLE CELL PACK
S-8241 Series
Pin No.
1
2
3
4
5
Symbol
VM
VDD
VSS
DO
CO
Description
Voltage detection pin between VM and VSS
(Overcurrent detection pin)
Positive power input pin
Negative power input pin
FET gate connection pin for discharge control
(CMOS output)
FET gate connection pin for charge control
(CMOS output)
1
2
Figure 2
3
Pin No.
5-Pin SON(A)
Top view
5
4
Symbol
VM
VDD
CO
DO
Description
Voltage detection pin between VM and VSS
(Overcurrent detection pin)
Positive power input pin
FET gate connection pin for charge control
(CMOS output)
FET gate connection pin for discharge control
(CMOS output)
1
2
3
4
1
2
3
5
VSS
Negative power input pin
Remark
Pin assignment of SOT-23-5 and of 5-Pin SON(A) are different.
Figure 3
Absolute Maximum Ratings
(Ta = 25°C unless otherwise specified)
Item
*1
Input voltage between VDD and VSS
VM Input pin voltage
CO output pin voltage
DO output pin voltage
Power dissipation
SOT-23-5
5-Pin SON(B)
Operating temperature range
Storage temperature range
Symbol
V
DS
V
VM
V
CO
V
DO
P
D
Topr
Tstg
Applicable pin
VDD
VM
CO
DO
−
−
−
Rating
V
SS
−0.3
to V
SS
+12
V
DD
−26
to V
DD
+0.3
V
VM
−0.3
to V
DD
+0.3
V
SS
−0.3
to V
DD
+0.3
250
150
−40
to +85
−40
to +125
Unit
V
V
V
V
mW
°C
°C
*1.
Do not apply pulse-like noise of
µs
order exceeding the above input voltage (V
SS
+ 12 V). The noise causes
damage to the IC.
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.
Seiko Instruments Inc.
5
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