AIC1803 データシートの表示（PDF） - Analog Intergrations
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AIC1803 Datasheet PDF : 12 Pages
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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.
PIN 2: CS-
PIN 3: OD -
PIN 4: NC -
PIN11: VC3- Input pin for battery BAT3
Input pin for current sensing.
voltage sensing. This pin is to be
Using the drain-source voltage of
connected to the positive
the discharge
control
terminal of the battery cell BAT3.
MOSFET M1 (voltage between
VCC and CS), it senses
discharge current
during
normal mode and detects
whether charging current is
present during power-down
PIN12: UD2 -
This pin is to be connected to the
positive terminal of the battery
cell BAT2 for cell-balancing
bleeding
function
under
overcharge condition.
mode.
PIN13: VC2- Input pin for battery BAT2
Output pin for control of discharge control MOSFET M1. Whvceoonlntanogevecetresdedisncshinatgorg. eTohtchisceuprisn, pitshoistsoitipbvieen goes high
No connection
terminal of the battery cell BAT2.
PIN 5: TD -
Overdischarge delay time setting
pin.
PIN 6: TI -
Overcurrent delay time setting
pin.
PIN 7: TC -
Overcharge delay time setting
pin.
PIN 8: NC - No connection.
PIN 9: GND - Ground pin. This pin is to be
PIN14: UD1- This pin is to be connected to the positive ter
PIN15: VC1-
Input pin for battery BAT1
voltage sensing. This pin is to be
connected to the positive
terminal of the battery cell BAT1.
PIN16: VCC - Power supply pin. This pin is to
be connected to the positive
terminal of the battery cell BAT1.
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.
Overcharge Protection
When the voltage of either of the battery cells
exceeds the overcharge protection voltage (VOCP)
beyond the overcharge delay time (TOC) period,
charging is inhibited by the turning-off of the
charge control MOSFET M2. The overcharge
delay time is set by the external capacitor CTC.
Inhibition of charging is immediately released
when the voltage of the overcharged cell becomes
lower than overcharge release voltage (VOCR or
VOCP-VHYS) through discharging.
Overdischarge Protection
When the voltage of either of the battery cells falls
below the overdischarge protection voltage (VODP)
8
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