Advanced Analog Technology, Inc.
AAT8635 Series
Details are subject to change without notice
ONE-CELL LI-ION BATTERY PROTECTION IC
FEATURES
•
Ideal for One-Cell Rechargeable Li-Ion Battery
Pack.
•
Low Current Consumption
3.0
µ
A
…………..Supply Current (Typical)
0.6
µ
A
…………..Standby Current
•
High Withstand Voltage
Absolute Maximum Ratings..22V (
V
DD
−
VN )
GENERAL DESCRIPTION
The AAT8635 series are protection ICs designed
to safeguard one-cell rechargeable Li-Ion battery
pack against over charge, over discharge, over
current, and short circuit. The AAT8635 series
use advanced high voltage CMOS process to
provide high accuracy voltage detection and low
current consumption.
The AAT8635 series incorporate a reference unit
and three voltage detectors. During the charging
process, when the cell voltage ( V
DD
) is charged to
a value higher than the over charge threshold
voltage ( V
C1
), the over charge detector (COM1)
will switch the output pin ( C
OUT
) to a low level
within a delay time ( t
C1
), and thus turning off the
MOSFET connected to the charging path. The
C
OUT
pin may change to high level again when
the V
DD
voltage falls below “ V
C1
−
V
HYS
”, or
when V
DD
falls below V
C1
while the charger is
disconnected from the battery pack.
During the discharging process, when the V
DD
drops to a value lower than the over-discharge
threshold voltage ( V
D1
), the over-discharge
detector (COM2) will switch D
OUT
to low level
within a delay time ( t
D1
), and thus turning off the
MOSFET connecting to the discharging path. In
the mean time, the AAT8635 series will enter a
low current standby mode. Once into standby
mode, the systems can only be released from
•
High Accuracy Voltage Detection
Over Charge Detector…………...
±
50mV
Over Discharge Detector……….
±
3.2%
•
Over Current and Short Circuit Protection
•
Wide Operating Temperature Range
−
40
o
C to
85
o
C
•
Ultra Small Package……..SOT26
PIN CONFIGURATION
D
OUT
GND
VN
V
DD
C
OUT
C
ext
–
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–
–
Advanced Analog Technology, Inc
.
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