AIC1811 datasheet(4/8 Pages) AIC

Part #	AIC1811

Description	One-Cell Lithium-Ion Battery Protection IC

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Manufacturer	AIC [Analog Intergrations Corporation]

Direct Link	http://www.analog.com.tw

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AIC1811

4

n BLOCK DIAGRAM

Power-down

Control

Wake-up Control

-0.3V

3

4

1

2

5

VCC

Overdischarge

Delay Circuit

Overcharge

Delay Circuit

Overcurrent

Delay Circuit

Enable

Load Detected

0.3V

0.2V

CS

GND

OC

OD

1.2V

1V

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.

PIN 2:

GND - Ground pin. This pin is to be

connected to the negative terminal

of the battery cell.

PIN 3:

OD

- Output

for

control

of

the

discharge control MOSFET M1.

When overdischarge occurs, this

pin goes low to turn off the

MOSFET M1 and discharging is

inhibited.

PIN 4:

CS

- Input

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 5:

VCC - Power supply pin. This pin is to be

connected to the positive terminal

of the battery cell.

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