AIC1821 AIC [Analog Intergrations Corporation], AIC1821 Datasheet - Page 4

• Manufacturer Part Number: AIC1821
• Description: ONE-CELL LITHIUM-ION BATTERY PROTECTION IC
• Manufacturer: AIC [Analog Intergrations Corporation]

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ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
BLOCK DIAGRAM
PIN DESCRIPTIONS
PIN 1: OC
PIN 2: GND - Ground pin. This pin is to be
PIN 3: OD
GND
VCC
CS
- PMOS open drain output for control
- Output
5
2
4
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.
connected to the negative terminal of
the battery cell.
discharge
When overdischarge occurs, this pin
pin
control
0.2V
for
1V
1.2V
control
MOSFET
of
ONE-CELL LITHIUM-ION BATTERY PROTECTION IC
M1.
the
-0.3V
0.3V
Overdischarge
Delay Circuit
Delay Circuit
Overcharge
Delay Circuit
Overcurrent
PIN 4: CS
PIN 5: VCC - Power supply pin. This pin is to be
www.analog.com.tw
TEL: [phone]
Enable
Enable
Wake-up Control
Power-down
Control
Load Detected
- Input pin for current sensing. Using
goes low to turn off the MOSFET M1
and discharging is inhibited.
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.
connected to the positive terminal of
the battery cell.
1
FAX:[phone]
OC
SPEC NO: DS-1821-P1 06/07/00
3
OD
AIC1821
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