Advanced Analog Technology, Inc.


– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Page 1 of 17 V 2.0
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
A0.3 µ …………..Supply Current (Typical)
A6.0 µ …………..Standby Current
• High Withstand Voltage
Absolute Maximum Ratings..22V ( VNV
DD
− )
• High Accuracy Voltage Detection
Over Charge Detector…………... mV50±
Over Discharge Detector………. %2.3±
• Over Current and Short Circuit Protection
• Wide Operating Temperature Range C40
o
− to
C85
o

• Ultra Small Package……..SOT26

PIN CONFIGURATION

OUT
D
VN
OUT
C
GND
ext
C
DD
V


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 (
DD
V ) is charged to
a value higher than the over charge threshold
voltage (
1C
V ), the over charge detector (COM1)
will switch the output pin (
OUT
C ) to a low level
within a delay time (
1C
t ), and thus turning off the
MOSFET connected to the charging path. The
OUT
C pin may change to high level again when
the
DD
V voltage falls below “
HYS1C
VV − ”, or
when
DD
V falls below
1C
V while the charger is
disconnected from the battery pack.
During the discharging process, when the
DD
V
drops to a value lower than the over-discharge
threshold voltage (
1D
V ), the over-discharge
detector (COM2) will switch
OUT
D to low level
within a delay time (
1D
t ), 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