AIC1803
Three-Cell Lithium-Ion Battery Protection IC
n
FEATURES
l
l
l
l
n
DESCRIPTION
The AIC1803 is designed to protect the lithium-
ion battery from damage or degrading the lifetime
due to overcharging, overdischarging and
overcurrent for three-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.
Ultra-Low Quiescent Current at 13µA (V
CELL
=3.5V).
Ultra-Low Power-Down Current at 1.3µA (V
CELL
=2.3V)
Wide Supply Voltage Range: 2V to 18V.
Precision Overcharge Protection Voltage:
4.35V± 30mV for the AIC1803A
4.30V± 30mV for the AIC1803B
4.25V± 30mV for the AIC1803C
4.20V± 30mV for the AIC1803D
l
l
l
Externally Set Overcharge, Overdischarge and
Overcurrent Delay Time.
Built-in Cell-balancing Bleeding Network under
Overcharge Condition.
Three Detection Levels for Overcurrent Protection.
n
l
APPLICATIONS
Protection IC for Three-Cell Lithium-Ion Battery Pack.
n
TYPICAL APPLICATION CIRCUIT
R8
1K
1
2
OC
CS
VCC
VC1
16
15
R4
C4
0.1
µ
F
1K
M1
FUSE
BATT+
R5
1M
BAT1
Q1
M2
C1 R1 2K
0.1
µ
F
3
4
OD
NC
UD1
VC2
14
13
R2 2K
C2
µ
F
0.1
5
6
C
TD
82nF
C
TI
2.2nF
TD
TI
UD2
VC3
12
11
R3 33K
C3
0.1µF
BAT2
R7
1M
BAT3
R6
1M
7
C
TC
82nF
TC
NC
UD3
GND
AIC1803
10
9
8
BATT-
Protection Circuit for Three-Cell Lithium-Ion Battery Pack
DS-1803-01 July 14, 00
www.analog.com.tw
1