AAT8640 Datasheet, PDF (1/25 Pages) Advanced Analog Technology, Inc. – ONE-CELL LI-ION BATTERY PROTECTION IC

Advanced Analog Technology, Inc.
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:
3μA Supply Current (Typical)
0.1μA Shutdown Current
z 3-Level Over Current Detection:
Over-Current Level 1 /Over Current Level 2
/ Short Circuit
z Wide Operating Temperature Range:
− 40^οC to 85^οC
z Small SOT25 Package
PIN CONFIGURATION
TOP VIEW
VN
VDD
GND
C_OUT
D_OUT
(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 V_C1(Over-Charge
Threshold Voltage), the output of C_out pin
switches to the low level, i.e., the VN pin level.
The output of C_out 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 V_D1
(Over-Discharge Threshold Voltage), the output
of D_out pin switches to low level immediately
after the internal delay time elapses. The output
of D_out pin will switch to high level when the
battery voltage is at a level higher than V_D2
(Over-Discharge Release Voltage).
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