AIC1803
n
PIN DESCRIPTIONS
PIN 1: OC-
NMOS open drain output for
control of the charge control
MOSFET M2. When overcharge
occurs, this pin sinks current to
switch the external PNP Q1 on,
and charging is inhibited by
turning off the charge control
MOSFET M2.
connected to the
negative
terminal of the battery cell BAT3.
PIN10: UD3 -
This pin is to be connected to the
positive terminal of the battery
cell BAT3
for
cell-balancing
bleeding
function
under
overcharge condition.
PIN11: VC3-
PIN 2: CS-
Input pin for current sensing.
Using the drain-source voltage of
the discharge
control
MOSFET M1 (voltage between
VCC and CS),
it senses
discharge
current
during
normal
mode
and
detects
whether charging
current
is
present
during power-down
mode.
Input pin for battery BAT3
voltage sensing. This pin is to be
connected
to
the
positive
terminal of the battery cell BAT3.
This pin is to be connected to the
positive terminal of the battery
cell BAT2 for cell-balancing
bleeding
function
under
overcharge condition.
PIN12: UD2 -
PIN13: VC2-
PIN 3: OD -
PIN 4: NC -
PIN 5: TD -
PIN 6: TI -
PIN 7: TC -
PIN 8: NC -
PIN 9: GND -
Output pin for control of discharge control MOSFET M1.
No connection
Overdischarge delay time setting
pin.
Overcurrent delay
pin.
time setting
PIN14: UD1-
PIN15: VC1-
Input pin for battery BAT2
voltage sensing. This pin is to be
When overdischarge occurs, this pin goes high
connected
to
the
positive
terminal of the battery cell BAT2.
This pin is to be connected to the positive ter
Input pin for battery BAT1
voltage sensing. This pin is to be
connected
to
the
positive
terminal of the battery cell BAT1.
Power supply pin. This pin is to
be connected to the positive
terminal of the battery cell BAT1.
Overcharge delay time setting
pin.
No connection.
Ground pin. This pin is to be
PIN16: VCC -
n
APPLICATION INFORMATIONS
l
THE OPERATION
Initialization
On initial power-up , such as connecting the
battery pack for the first time to the AIC1803 , the
AIC1803 enters the power-down mode . A charger
must be applied to the AIC1803 circuit to enable
the pack.
beyond the overcharge delay time (T
OC
) period,
charging is inhibited by the turning-off of the
charge control MOSFET M2. The overcharge
delay time is set by the external capacitor C
TC
.
Inhibition of charging is immediately released
when the voltage of the overcharged cell becomes
lower than
overcharge release voltage (V
OCR
or
V
OCP
-V
HYS
) through discharging.
Overcharge Protection
When the voltage of either of the battery cells
exceeds the overcharge protection voltage (V
OCP
)
Overdischarge Protection
When the voltage of either of the battery cells falls
below the overdischarge protection voltage (V
ODP
)
8
AIC [ ANALOG INTERGRATIONS CORPORATION ]
