S-8254A Series
BATTERY PROTECTION IC
FOR 3-SERIAL- OR 4-SERIAL-CELL PACK
Rev.5.0
_01
www.sii-ic.com
© Seiko Instruments Inc., 2002-2010
The S-8254A series is a protection IC for 3-serial- or 4-serial-cell lithium-ion / lithium polymer rechargeable
batteries and includes a high-accuracy voltage detector and delay circuit.
The S-8254A 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
*1
Accuracy
±50
mV
•
Overcharge release voltage n (n
=
1 to 4)
3.8 V to 4.4 V
•
Overdischarge detection voltage n (n
=
1 to 4) 2.0 V to 3.0 V (100 mV steps) Accuracy
±80
mV
Accuracy
±100
mV
•
Overdischarge release voltage n (n
=
1 to 4)
2.0 V to 3.4 V
*2
(2) Three-level overcurrent protection
•
Overcurrent detection voltage 1
0.05 V to 0.30 V (50 mV steps) Accuracy
±25
mV
•
Overcurrent detection voltage 2
0.5 V
Accuracy
±100
mV
Accuracy
±300
mV
•
Overcurrent detection voltage 3
V
VC1
−
1.2 V
(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) High-withstand voltage device
Absolute maximum rating : 26 V
(7) Wide operating voltage range
2 V to 24 V
(8) Wide operating temperature range
−40°C
to
+
85°C
(9) Low current consumption
•
Operation mode
30
μA
max. (+25°C)
•
Power-down mode 0.1
μA
max. (+25°C)
*3
(10) Lead-free, Sn100%, halogen-free
*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)
*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)
*3.
Refer to “
Product Name Structure”
for details.
Applications
•
Lithium-ion rechargeable battery packs
•
Lithium polymer rechargeable battery packs
Package
•
16-Pin TSSOP
Seiko Instruments Inc.
1
SII [ SEIKO INSTRUMENTS INC ]
