參數(shù)資料
型號： AAT3697IWP-4.2-T1
廠商： Advanced Analog Technology,lnc.
英文描述： 2A Lithium-Ion/Polymer Battery Charger
中文描述： 第2A鋰離子電池充電器
文件頁數(shù)： 9/22頁
文件大?。?/td> 1269K
代理商： AAT3697IWP-4.2-T1
AAT3697
2A Lithium-Ion/Polymer Battery Charger
3697.2007.02.1.1
9
Functional Block Diagram
Charge
Control
Reverse Blocking
CV/
Precharge
Constant
Current
Current
Compare
ADP
BAT
ADPSET
UVLO
Over-
Temperature
Protection
Charge
Status
STAT2
STAT1
4.2V
Serial
Data
DATA
Watchdog
Timer
CT
Voltage
Sense
ADPP#
EN
GND
IC enable
TS
Functional Description
The AAT3697 is a highly integrated single-cell lithi-
um-ion/polymer battery charger IC designed to
operate with standard AC adapter input sources,
while requiring a minimum number of external
components. The AAT3697 precisely regulates
battery charge voltage and current for 4.2V lithium-
ion/polymer battery cells.
The adapter charge input constant current level
can be programmed up to 2.0A for rapid charging
applications. The AAT3697 is rated for operation
from -40°C to +85°C. In the event of operating
ambient temperatures exceeding the power dissi-
pation abilities of the device package for a given
constant current charge level, the charge control
will enter into thermal regulation. When the system
thermal regulation becomes active, the pro-
grammed constant current charge amplitude will
be automatically reduced to a safe level for the cur-
rent operating condition. Should the ambient oper-
ating temperature drop below the thermal loop
threshold, the system will automatically resume
charging at the full programmed constant current
level. This intelligent thermal management system
permits the AAT3697 to operate and safely charge
a battery cell over a wide range of ambient condi-
tions while maximizing the greatest possible
charge current for the given set of conditions.
Status monitor output pins are provided to indicate
the battery charge state by directly driving two
external LEDs. A serial interface output is also
available to report any one of 12 distinct charge
states to the system microcontroller.
Battery temperature and charge state are fully
monitored for fault conditions. In the event of an
over-voltage or over-temperature failure, the
device will automatically shut down, thus protecting
the charging device, control system, and the bat-
tery under charge. In addition to internal charge
controller thermal protection, the AAT3697 also
provides a temperature sense feedback function
(TS pin) from the battery to shut down the device in
the event the battery exceeds its own thermal limit
during charging. All fault events are reported to the
user either by the simple status LEDs or via the
DATA pin function.
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