Rev.2.7
_00
BATTERY PROTECTION IC
FOR 3-SERIAL OR 4-SERIAL-CELL PACK
S-8254 Series
The S-8254 series is a protection IC for 3-serial or 4-
serial cell lithium ion rechargeable batteries and includes
a high-accuracy voltage detector and delay circuit.
The S-8254 series protects both 3-serial or 4-serial cells
using the SEL pin for switching.
Features
(1) High-accuracy voltage detection for each cell
•
Overcharge detection voltage n (n
=
1 to 4)
3.9 to 4.4 V (50 mV steps)
Accuracy
±
25 mV
*1
Accuracy
±
50 mV
•
Overcharge release voltage n (n
=
1 to 4)
3.8 to 4.4 V
•
Overdischarge detection voltage n (n
=
1 to 4) 2.0 to 3.0 V (100 mV steps)
Accuracy
±
80 mV
*2
Accuracy
±
100 mV
•
Overdischarge release voltage n (n
=
1 to 4)
2.0 to 3.4 V
(2) Three-level overcurrent protection
•
Overcurrent detection voltage 1
0.05 to 0.30 V (50 mV steps) Accuracy
±
25 mV
•
Overcurrent detection voltage 2
0.5 V
Accuracy
±
100 mV
•
Overcurrent detection voltage 3
VC1
−
1.2 V
Accuracy
±
300 mV
(3) Delay times for overcharge detection, overdischarge detection and overcurrent detection 1 can be set by
external capacitors (delay times for overcurrent detection 2 and 3 are fixed internally).
(4) Switchable between a 3-serial cell and 4-serial cell using the SEL pin
(5) Charge/discharge operation can be controlled via the control pins.
(6) Withstanding voltage element
Absolute maximum rating : 26 V
(7) Wide operating voltage range
2 to 24 V
(8) Wide operating temperature range
−
40 to
+
85
°C
(9) Low current consumption
•
Operation mode
30
µA
max. (+ 25
°C)
•
Power-down mode 0.1
µA
max. (+ 25
°C)
*1.
Overcharge hysteresis voltage n (n
=
1 to 4) can be selected as 0 V or from a range of 0.1 to 0.4 V in
50 mV steps.
(Overcharge hysteresis voltage
=
Overcharge detection voltage
−
Overcharge release voltage)
*2.
Overdischarge hysteresis voltage n (n
=
1 to 4) can be selected as 0 V or from a range of 0.2 to 0.7 V in
100 mV steps.
(Overdischarge hysteresis voltage
=
Overdischarge release voltage
−
Overdischarge detection voltage)
Application
•
Lithium-ion rechargeable battery packs
Package
Package Name
16-Pin TSSOP
Package
FT016-A
Drawing Code
Tape
FT016-A
Reel
FT016-A
Seiko Instruments Inc.
1
BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK
S-8254 Series
Block Diagram
COP
DOP, COP,
RVCM, RVSM
Control Circuit
Delay Circuit
Delay Circuit
Delay Circuit
1 MΩ
VMP
900 kΩ
−
+
+
−
−
+
+
−
Rev.2.7
_00
VDD
VC1
Delay Circuit
VC2
VC3
DOP
+
−
−
+
+
−
VINI
+
−
+
−
−
+
+
−
VC4
CDT
CCT
200 nA
CTL
VSS
SEL
Figure 1
2
Seiko Instruments Inc.
Rev.2.7
_00
BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK
S-8254 Series
Product Name Structure
1. Product Name
S−8254A
xx
FT
−
TB
IC direction in tape specifications
*1
Package code
FT : 16-Pin TSSOP
Serial code
*2
Sequentially set from AA to ZZ
*1.
Refer to the taping specifications at the end of this book.
*2.
Refer to the “2.
Product Name List”.
2. Product Name List
Table 1
Overcharge
Overcharge
Overdischarge
Overdischarge
Overcurrent
0 V battery
detection voltage release voltage detection voltage release voltage detection voltage
charge function
[V
CU
]
[V
CL
]
[V
DL
]
[V
DU
]
[V
IOV1
]
Available
S-8254AAAFT-TB 4.350
±
0.025 V 4.150
±
0.050 V 2.00
±
0.080 V
2.70
±
0.100 V
0.30
±
0.025 V
Available
S-8254AABFT-TB 4.250
±
0.025 V 4.250
±
0.025 V 2.00
±
0.080 V
2.70
±
0.100 V
0.30
±
0.025 V
Available
S-8254AAEFT-TB 4.350
±
0.025 V 4.150
±
0.050 V 2.00
±
0.080 V
2.70
±
0.100 V
0.20
±
0.025 V
Available
S-8254AAFFT-TB 4.350
±
0.025 V 4.150
±
0.050 V 2.40
±
0.080 V
3.00
±
0.100 V
0.20
±
0.025 V
Available
S-8254AAGFT-TB 4.275
±
0.025 V 4.075
±
0.050 V 2.30
±
0.080 V
2.70
±
0.100 V
0.13
±
0.025 V
Available
S-8254AAHFT-TB 4.350
±
0.025 V 4.150
±
0.050 V 2.40
±
0.080 V
2.70
±
0.100 V
0.10
±
0.025 V
Available
S-8254AAIFT-TB 4.350
±
0.025 V 4.150
±
0.050 V 2.40
±
0.080 V
3.00
±
0.100 V
0.30
±
0.025 V
Available
S-8254AAJFT-TB 4.350
±
0.025 V 4.150
±
0.050 V 2.40
±
0.080 V
3.00
±
0.100 V
0.15
±
0.025 V
Available
S-8254AAKFT-TB 4.350
±
0.025 V 4.150
±
0.050 V 2.70
±
0.080 V
3.00
±
0.100 V
0.20
±
0.025 V
Available
S-8254AALFT-TB 4.300
±
0.025 V 4.150
±
0.050 V 2.40
±
0.080 V
3.00
±
0.100 V
0.20
±
0.025 V
Available
S-8254AAMFT-TB 4.200
±
0.025 V 4.100
±
0.050 V 2.50
±
0.080 V
2.70
±
0.100 V
0.30
±
0.025 V
Available
S-8254AANFT-TB 4.250
±
0.025 V 4.150
±
0.050 V 2.50
±
0.080 V
3.00
±
0.100 V
0.10
±
0.025 V
Remark
Please contact the SII marketing department for the products with the detection voltage value other
than those specified above.
Product name /
Parameter
Seiko Instruments Inc.
3
BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK
S-8254 Series
Pin Configuration
16-Pin TSSOP
Top view
COP
VMP
DOP
VINI
CDT
CCT
VSS
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD
VC1
VC2
VC3
VC4
CTL
SEL
NC
Rev.2.7
_00
Figure 2
Table 2
Pin description
Connection of charge control FET gate (Nch open-drain output)
Voltage detection between VC1 and VMP (Overcurrent 3 detection pin)
Connection of discharge control FET gate (CMOS output)
Voltage detection between VSS and VINI (Overcurrent 1, 2 detection pin)
Capacitor connection for overdischarge detection, Overcurrent detection 1 delay
Capacitor connection for overcharge detection delay
Negative power supply input, Negative voltage connection for battery 4
No connection
No connection
Pin for switching 3-serial cell / 4-serial cell
VSS level : 3-serial cell, VDD level : 4-serial
11
CTL
Control of charge FET and discharge FET
12
VC4
Connection for negative voltage of battery 3, Positive voltage of battery 4
13
VC3
Connection for negative voltage of battery 2, Positive voltage of battery 3
14
VC2
Connection for negative voltage of battery 1, Positive voltage of battery 2
15
VC1
Connection for positive voltage of battery 1
16
VDD
Connection for positive power supply input, Positive voltage of battery 1
*1.
The NC pin is electrically open. The NC pin can be connected to VDD or VSS.
Pin No.
1
2
3
4
5
6
7
8
9
10
Symbol
COP
VMP
DOP
VINI
CDT
CCT
VSS
NC
*1
NC
*1
SEL
4
Seiko Instruments Inc.
Rev.2.7
_00
BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK
S-8254 Series
Absolute Maximum Ratings
Table 3
Parameter
Input voltage between VDD
and VSS
Input pin voltage
Symbol
V
DS
V
IN
Applicable Pins
(Ta
=
25
°C
unless otherwise specified)
Absolute Maximum Ratings Unit
V
SS
−
0.3 to V
SS
+
26
V
VC1, VC2, VC3, VC4,
V
V
SS
−
0.3 to V
DD
+
0.3
CTL, SEL, CCT, CDT, VINI
VMP
V
VMP pin input voltage
V
VMP
V
SS
−
0.3 to V
SS
+
26
DOP
V
DOP pin output voltage
V
DOP
V
SS
−
0.3 to V
DD
+
0.3
COP
V
COP pin output voltage
V
COP
V
SS
−
0.3 to V
SS
+
26
Power dissipation
P
D
400
mW
Operating ambient temperature
Topr
−
40 to
+
85
°C
Storage temperature
Tstg
−
40 to
+
125
°C
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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