Advanced Analog Technology, Inc.
Product information presented is current as of publication date. Details are subject to change without notice.
ONE-CELL LI-ION BATTERY PROTECTION IC
FEATURES
GENERAL DESCRIPTION
z Ideal for One-Cell Rechargeable Li-Ion
The AAT8661 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.
Battery Packs
z High Accuracy Voltage Detection
z Low Current Consumption:
3μA Supply Current (Typical)
0.1μA Shutdown Current
Each of the AAT8661 devices incorporates
voltage comparators, bandgap reference voltage
generator, signal delay circuit, short circuit
detector, and digital control circuit.
z 3-Level Over Current Detection:
Over-Current Level 1 /Over Current Level 2
/ Short Circuit
z Wide Operating Temperature Range:
− 40οC to 85οC
In the charge process, when the battery voltage is
charged to a value greater than VC1(Over-Charge
z Small SOT26 Package
Threshold Voltage), the output of Cout pin
switches to the low level, i.e., the VN pin level.
The output of Cout pin will switch to high level
PIN CONFIGURATION
when the battery voltage falls lower than VC2
(Over-Charge Release Voltage), or when the
charger is disconnected from the battery pack and
the battery voltage level ranges between VC1 and
VC2.
D out
GND
VDD
During the discharge process, when the battery
voltage drops to a value lower than VD1
VN
(Over-Discharge Threshold Voltage), the output
of Dout pin switches to low level immediately
NULL
Cout
after the internal delay time elapses. The output
of Dout pin will switch to high level when the
battery voltage is at a level higher than VD2
(Over-Discharge Release Voltage).
Over current level 1 voltage (VOC1 ) is used to
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