AIC1811
n
BLOCK DIAGRAM
Wake-up Control
-0.3V
Enable
Load Detected
CS
4
0.2V
0.3V
Enable
Overcurrent
Delay Circuit
3
VCC
5
1V
OD
Overdischarge
Delay Circuit
Power-down
Control
Overcharge
Delay Circuit
1.2V
GND
2
1
OC
n
PIN DESCRIPTIONS
PIN 1: OC
- PMOS open drain output for
control of the charge control
MOSFET M2. In normal mode,
this PMOS turns on to pull the
gate of the MOSFET M2 to high,
then the MOSFET M2 turns on.
When overcharge occurs, this
PMOS turns off, then no current
flows through R3 and the
MOSFET M2 turns off.
MOSFET M1 and discharging is
inhibited.
PIN 4: CS
- Input pin for current sensing.
Using the sum of drain-source
voltages of the MOSFET M1 and
the
MOSFET
M2
(voltage
between CS and GND), it senses
discharge current during normal
mode and detects whether charge
current is present during power-
down mode. It also used to detect
whether load is connected during
overcharge mode.
PIN 2: GND - Ground pin. This pin is to be
connected to the negative terminal
of the battery cell.
PIN 3: OD
- Output pin for control of
discharge control MOSFET
When overdischarge occurs,
pin goes low to turn off
the
M1.
this
the
PIN 5: VCC - Power supply pin. This pin is to be
connected to the positive terminal
of the battery cell.
4
AIC [ ANALOG INTERGRATIONS CORPORATION ]
