Document Outline
- S-8254 Series
- Cover
- Features
- Applications
- Package
- Block Diagram
- Selection Guide
- Pin Assignment
- Absolute Maximum Ratings
- Electrical Characteristics
- Test Circuits
- Description of Operation
- Operation Timing Chart
- Standard Circuit
- Precautions
- Characteristics (Typical Data)
- Package Drawing
Rev.2.3
_00
BATTERY PROTECTION IC
FOR 3-SERIAL OR 4-SERIAL-CELL PACK
S-8254 Series
Seiko Instruments Inc.
1
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 V to 4.4 V (50 mV steps) Accuracy
25 mV
Overcharge release voltage n (n = 1 to 4)
3.8 V to 4.4 V
*1
Accuracy
50 mV
*1. Overcharge hysteresis voltage n (n
= 1 to 4) can be selected as 0 V or from a range of 0.1 V to 0.4
V in 50 mV steps.
(Overcharge hysteresis voltage
= Overcharge detection voltage - Overcharge release voltage)
Overdischarge detection voltage n (n = 1 to 4) 2.0 V to 3.0 V (100 mV steps) Accuracy 80 mV
Overdischarge release voltage n (n = 1 to 4) 2.0 V to 3.4 V
*2
Accuracy
100 mV
*2. Overdischarge hysteresis voltage n (n
= 1 to 4) can be selected as 0 V or from a range of 0.2 V to
0.7 V in 100 mV steps.
(Overdischarge
hysteresis
voltage
= Overdischarge release voltage - Overdischarge detection
voltage)
(2) Three-level overcurrent protection
Overcurrent detection voltage 1
0.05 V to 0.3 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 V to 24 V
(8) Wide operating temperature range
-40C to +85 C
(9) Low current consumption
Operation mode 30 A max. (+25C)
Power-down mode 0.1 A max. (+25C)
Applications
Lithium-ion rechargeable battery packs
Package
16-Pin TSSOP (Package drawing code: FT016-A)
BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK
S-8254 Series
Rev.2.3
_00
Seiko Instruments Inc.
2
Block Diagram
COP
VDD
VSS
VMP
DOP
VINI
CDT
VC1
VC2
VC3
-
+
+
-
-
+
+
-
-
+
+
-
-
+
+
-
CTL
SEL
VC4
DOP, COP,
RVCM, RVSM
Control Circuit
+
-
+
-
+
-
Delay Circuit
Delay Circuit
Delay Circuit
Delay Circuit
1 M
900 k
CCT
200 nA
Figure 1
BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK
Rev.2.3
_00
S-8254 Series
Seiko Instruments Inc.
3
Selection Guide
1. Product Name
S
-
-
-
-8254A xx FT ---- TB
IC direction of tape specifications
*1
Package abbreviation
FT: 16-Pin TSSOP
Additional number
Sequentially set from AA to ZZ
*1. Refer to the taping drawing.
2. Product Name List
Table 1
Product
Name/Parameter
Overcharge
Detection Voltage
V
CU
Overcharge
Release Voltage
V
CL
Overdischarge
Detection Voltage
V
DL
Overdischarge
Release Voltage
V
DU
Overcurrent
Detection Voltage 1
V
IOV1
0 V Battery
Charge Function
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
Remark If a product with the required detection voltage does not appear in the above list, contact our sales
office.
BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK
S-8254 Series
Rev.2.3
_00
Seiko Instruments Inc.
4
Pin Assignment
16-Pin TSSOP
Top view
8
7
6
5
3
2
4
1
11
16
10
12
14
15
13
COP
VMP
DOP
VINI
CDT
CCT
VSS
NC
VDD
VC1
VC2
VC3
VC4
CTL
SEL
NC
Figure 2
Table 2
Pin
No. Name
Function
1
COP Connection of charge control FET gate (Nch open-drain output)
2
VMP Voltage detection between VC1 and VMP (overcurrent 3 detection pin)
3
DOP Connection of discharge control FET gate (CMOS output)
4
VINI Voltage detection between VSS and VINI (overcurrent 1, 2 detection pin)
5 CDT
Capacitor connection for overdischarge detection and overcurrent detection 1
delay
6
CCT Capacitor connection for overcharge detection delay
7
VSS Negative power supply input, negative voltage connection for battery 4
8 NC
No connection
*1
9 NC
No connection
*1
10
SEL Pin for switching 3-serial cell/4-serial cell
VSS level: 3-serial cell, VDD level: 4-serial cell
11
CTL Control of charge FET and discharge FET
12
VC4 Connection for negative voltage of battery 3 and positive voltage of battery 4
13
VC3 Connection for negative voltage of battery 2 and positive voltage of battery 3
14
VC2 Connection for negative voltage of battery 1 and positive voltage of battery 2
15
VC1 Connection for positive voltage of battery 1
16
VDD Connection for positive power supply input and positive voltage of battery 1
*1. NC indicates that the pin is electrically open. Therefore, the pin can be connected to VDD or
VSS.
BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK
Rev.2.3
_00
S-8254 Series
Seiko Instruments Inc.
5
Absolute Maximum Ratings
Table 3
(Ta
= 25C unless otherwise specified)
Parameter Symbol
Applicable
Pins Rating
Unit
Input voltage between VDD and
VSS
V
DS
V
SS
- 0.3 to V
SS
+ 26
V
Input pin voltage
V
IN
VC1, VC2, VC3, VC4,
CTL, SEL, CCT, CDT, VINI V
SS
- 0.3 to V
DD
+ 0.3
VMP pin input voltage
V
VMP
VMP
V
SS
- 0.3 to V
SS
+ 26
DOP pin output voltage
V
DOP
DOP
V
SS
- 0.3 to V
DD
+ 0.3
COP pin output voltage
V
COP
COP
V
SS
- 0.3 to V
SS
+ 26
Power dissipation
P
D
400 mW
Operating temperature range
T
opr
-40 to +85
C
Storage temperature range
T
stg
-40 to +125
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.
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