Contents
Features ..............................................................1
Applications .........................................................1
Selection Guide ...................................................2
Block Diagram .....................................................3
Pin Assignment....................................................4
Pin Description ....................................................4
Absolute Maximum Ratings .................................4
Electrical Characteristics......................................5
Measuremnet Circuits ..........................................7
Description...........................................................12
Operation Timing Charts......................................16
Battery Protection IC Connection Example ..........18
Precautions..........................................................19
Dimensions..........................................................20
Markings ..............................................................20
Taping ................................................................21
Characteristcs (typical characteristics).................23
Seiko Instruments Inc.
1
21 August,1997
S-8233B SERIES
BATTERY PROTECTION IC (FOR A 3-SERIAL-CELL PACK)
The 8233B is a series of lithium-ion rechargeable battery protection ICs
incorporating high-accuracy (25 mV) voltage detection circuits and
delay circuits. It is suitable for a 3-serial-cell lithium-ion battery pack.
Features
(1)
Internal high-accuracy voltage detection circuit
Over charge detection voltage
3.80
0.025 V to 4.40
0.025 V
5 mV - step
Over charge release voltage
3.45
0.100 V to 4.40
0.100 V
5 mV - step
(The over charge release voltage can be selected within the range where a difference from over
charge detection voltage is 0 to 0.35 V with 50 mV - step)
Over discharge detection voltage
2.00
0.08 V to 2.80
0.08 V
50 mV - step
Over discharge release voltage
2.00
0.10 V to4.00
0.10 V
50.mV - step
(The over discharge release voltage can be selected within the range where a difference from
over discharge detection voltage is 0 to 1.2V with 50 mV - step)
Over current detection voltage 1
0.15 V
10% to 0.50 V
10%
50 mV - step
(2)
High input-voltage device (absolute maximum rating: 26 V)
(3)
Wide operating voltage range:
2 V to 24 V
(4)
The delay time for every detection can be set via an external capacitor.
(5)
Three over current detection levels (protection for short-circuiting)
(6)
Internal charge/discharge prohibition circuit via the control terminal
(7)
The function for charging batteries from 0 V is available.
(8)
Low current consumption
Operation
50
A max. (+25
C)
Power-down
0.1
A max. (+25
C)
(9)
16-pin TSSOP package
Applications
Lithium-ion rechargeable battery packs
Battery Protection IC(for a 3-serial-cell pack)
S-8233B Series
21 August,1997
Seiko Instruments Inc.
2
Selection Guide
Table1
Model
/
Item
Over charge
detection
voltage
Over charge
release
voltage
Over discharge
detection
voltage
Over discharge
release voltage
Over current
detection
voltage1
0V battery
charging
function
Conditioning
function
CTL logic
S-8233BAFT 4.2250.025V
*1
2.300.08V
2.700.10V
0.20V10%
Unavailable
Available
normal
S-8233BBFT 4.3250.025V
4.100.10V
2.300.08V
2.700.10V
0.20V10%
Unavailable
Unavailable
reverse
*1) Without over charge detection / release hysteresis.
*2) The input voltage of CTL for normal condition is changed by the CTL logic. (Please refer description).
Change in the detection voltage is available in products other than the above listed ones. Contact the
SII Semiconductor Products Sales Department.
Battery Protection IC(for a 3-serial-cell pack)
21 August,1997
S-8233B Series
Seiko Instruments Inc.
3
Block Diagram
Battery 1
Over charge
Battery 3
Over discharge
Battery 3
Over charge
Battery 2
Over charge
Battery 2
Over discharge
Over charge
delay circuit
Battery 1
Over discharge
Battery 3
Over charge
Battery 2
Over charge
Battery 1
Over charge
Reference
voltage 3
Reference
voltage 2
Reference
voltage 1
Control
Logic
Over current
detection
circuit
Over discharge
delay circuit
Over current 1
delay circuit
Over current
2,3 delay circuit
-
+
-
+
-
+
-
+
-
+
-
+
DOP
VMP
COVT
CDT
CCT
COP
CTL
VSS
CD3
VC2
CD2
CD1
VC1
VCC
Floating
detection circuit
Figure 1
The delay time for over current detection 2 and 3 is fixed by an internal IC circuit. The delay time
cannot be changed via an external capacitor.
Battery Protection IC(for a 3-serial-cell pack)
S-8233B Series
21 August,1997
Seiko Instruments Inc.
4
Pin Assignment
Top View
VSS
VMP
VCC
CTL
14
13
12
11
10
9
7
6
5
4
3
2
1
DOP
COP
CCT
COVT
CDT
VC1
VC2
CD1
CD3
CD2
8
15
16
NC
NC
T S S O P -16
Figure 2
Pin Description
Table 2
No.
Name
Description
1
DOP
Connects FET gate for discharge control (CMOS output)
3
COP
Connects FET gate for charge control (Nch open-drain output)
4
VMP
Detects voltage between VCC to VMP(Over current detection pin)
5
COVT Connects capacitor for over current detection1delay circuit
6
CDT
Connects capacitor for over discharge detection delay circuit
7
CCT
Connects capacitor for over charge detection delay circuit
8
VSS
Negative power input, and connects negative voltage for battery 3
9
CTL
Charge/discharge control signal input
10
CD3
Battery 3 conditioning signal output
11
VC2
Connects battery 2 negative voltage and battery 3 positive voltage
12
CD2
Battery 2 conditioning signal output
13
VC1
Connects battery 1 negative voltage and battery 2 positive voltage
14
CD1
Battery 1 conditioning signal output
16
VCC
Positive power input and connects battery 1 positive voltage
2,15
NC
Non connect
Absolute Maximum Ratings
Table 3
Ta = 25
C
Item
Sym.
Applied Pins
Rating
Unit
Input voltage between VCC and VSS
VDS
VSS-0.3 to VSS+26
V
Input terminal voltage
VIN
VC1,VC2,CTL,CCT,CDT,COVT
VSS-0.3 to VCC+0.3
V
VMP Input terminal voltage
VVMP
VMP
VSS-0.3 to VSS+26
V
CD1 output terminal voltage
VCD1
CD1
VC1-0.3 to VCC+0.3
V
CD2 output terminal voltage
VCD2
CD2
VC2-0.3 to VCC+0.3
V
CD3 output terminal voltage
VCD3
CD3
VSS-0.3 to VCC+0.3
V
DOP output terminal voltage
VDOP
DOP
VSS-0.3 to VCC+0.3
V
COP output terminal voltage
VCOP
COP
VSS-0.3 toVVMP+0.3
V
Power dissipation
PD
TSSOP-16PKG
300
m W
Operating temperature range
Topr
-20 to +70
C
Storage temperature range
Tstg
-40 to +125
C
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