Advanced Analog Technology, Inc.


– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 1 of 25 V2.0
AAT8640 Series
Product information presented is current as of publication date. Details are subject to change without notice.

ONE-CELL LI-ION BATTERY PROTECTION IC

FEATURES
z Ideal for One-Cell Rechargeable Li-Ion
Battery Packs
z High Accuracy Voltage Detection
z Low Current Consumption:
A3μ Supply Current (Typical)
A1.0 μ Shutdown Current
z 3-Level Over Current Detection:
Over-Current Level 1 /Over Current Level 2
/ Short Circuit
z Wide Operating Temperature Range:
C85 toC40
οο
−
z Small SOT25 Package


PIN CONFIGURATION
OUT
C
OUT
D
VN
VDD
GND
VIEW TOP
(SOT25)

GENERAL DESCRIPTION
The AAT8640 series are designed to protect
one-cell rechargeable Li-Ion battery pack against
over-charge, over-discharge, over-current and
short circuit. They use CMOS process to provide
high accuracy voltage detection and low current
consumption.
Each of the AAT8640 devices incorporates
voltage comparators, bandgap reference voltage
generator, signal delay circuit, short circuit
detector, and digital control circuit.
In the charge process, when the battery voltage is
charged to a value greater than
1C
V (Over-Charge
Threshold Voltage), the output of
out
C pin
switches to the low level, i.e., the VN pin level.
The output of
out
C pin will switch to high level
when the battery voltage falls lower than V
C2

(Over-Charge Release Voltage), or when the
charger is disconnected from the battery pack and
the battery voltage level ranges between V
C1
and
V
C2
.
During the discharge process, when the battery
voltage drops to a value lower than
1D
V

(Over-Discharge Threshold Voltage), the output
of
out
D pin switches to low level immediately
after the internal delay time elapses. The output
of
out
D pin will switch to high level when the
battery voltage is at a level higher than
2D
V
(Over-Discharge Release Voltage).