AIC1804
Three- Or Four-Cell Lithium-Ion Battery
Protection IC
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FEATURES
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DESCRIPTION
The AIC1804 is designed to protect the lithium-
ion battery from damage or degrading the lifetime
due to overcharging, overdischarging and
overcurrent for three- or four-cell lithium-ion
battery powered systems such as notebook PCs.
It can also provide the cell-balancing “bleeding”
function
to
automatically
discharge
the
overcharged cell until the overcharge condition is
released.
Safe and full utilization charging is ensured by
the accurate
±30mV
overcharge detection. Four
different specification values for overcharge
protection voltage are provided for various
protection requirements. The very low standby
current drains little current from the cell while in
storage.
Cell Number Selection Function to Select 3 or 4
cells Protection.
Ultra-Low Quiescent Current at 17µA (4-Cell,
V
CELL
=3.5V).
Ultra-Low Power-Down Current at 2.2µA (4-Cell,
V
CELL
=2.3V)
Wide Supply Voltage Range: 2V to 18V.
Precision Overcharge Protection Voltage:
4.35V± 30mV for the AIC1804A
4.30V± 30mV for the AIC1804B
4.25V± 30mV for the AIC1804C
4.20V± 30mV for the AIC1804D
Externally Set Overcharge, Overdischarge and
Overcurrent Delay Time.
Built-in Cell-balancing Bleeding Network under
Overcharge Condition.
Three Detection Levels for Overcurrent Protection.
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APPLICATIONS
Protection IC for Three- or Four-Cell Lithium-Ion
Battery Packs.
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TYPICAL APPLICATION CIRCUIT
R8
1K
1
16
NSL
VCC
R1
200
SI4435
M1
SI4435
M2
R5
1M
2N3906
Q1
FUSE
BATT+
C1
0.1
µ
F
2
BAT1
R2
2K
BAT2
R3
2K
BAT3
R4
R7
1M
OC
UD1
15
VC1
14
3
CS
C2
0.1
µ
F
4
OD
5
TD
UD2
13
VC2
12
C3
0.1
µ
F
R6
1M
C
T D
82nF
C
T I
2.2nF
6
TI
7
TC
UD3
11
10
VC3
C4
0.1
µ
F
C
TC
82nF
8
33K
BAT4
GND
UD4
9
AIC1804
BATT-
Protection Circuit for Four-Cell Lithium-Ion Battery Pack
DS-1804-01 July 13, 00
www.analog.com.tw
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AIC [ ANALOG INTERGRATIONS CORPORATION ]
