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AAT3663 데이터시트(PDF) 10 Page - Advanced Analogic Technologies

부품명 AAT3663
상세설명  1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications
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제조업체  ANALOGICTECH [Advanced Analogic Technologies]
홈페이지  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

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Functional Block Diagram
Charge
Control
Current
Compare
Reverse Blocking
CV/
Precharge
Constant
Current
IN
BAT
ISET
UVLO
Over-Temp
Protect
Power
Detection
STAT 1
GND
EN
Thermal
Loop
ADPP#
Charge
Status
BATS
CT
TS
STAT 2
Watchdog
Timer
TERM
75μA
AAT3663-2 Only
Window Comparator
AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
10
3663.2007.10.1.0
Functional Description
The AAT3663 is a high performance battery charger
designed to charge single/dual cell Lithium-Ion or
Lithium-Polymer batteries with up to 1000mA of current
from an external power source. It is a highly integrated
stand-alone charging solution, with the least external
components required for complete functionality.
The AAT3663 precisely regulates end of charge bat-
tery voltage and current for single cell 4.2V and dual
cell 8.4V lithium-ion/polymer battery with a program-
mable constant current range from 100mA to 1A for
fast charging applications. The system has a default
charge termination current set to 10 percent of the pro-
grammed fast charge constant. The charge termina-
tion current may also be user programmed by an
external resistor.
During battery charging, the device temperature will
rise. In some cases with adapter (ADP) charging, the
power dissipation in the charge regulation pass device
may cause the junction temperature to rise and
approach the internal thermal shutdown threshold.
Excessive power dissipation is caused by the high
input adapter voltage versus the low output battery cell
voltage difference at a given constant charge current.
In the event of an internal over-temperature condition
caused by excessive ambient operating temperature
or excessive power dissipation conditions, the
AAT3663 enables a digitally controlled thermal loop
system that will reduce the charging current to prevent
thermal shutdown. The digital thermal loop will main-
tain the maximum possible battery charging current for
a given set of input to output power dissipation and
ambient temperature conditions.
The digital thermal loop control is dynamic in the sense
that it will continue to adjust the battery charging cur-
rent as operating conditions change. The digital ther-
mal loop will reset and resume normal operation when
the power dissipation or over-temperature conditions
are removed.
In the event of an over-voltage, over-current or over-
temperature false condition beyond the limits of the
digital thermal loop system, the device will automati-
cally shut down, thus protecting the charging device,
control system, and the battery under charge.
AAT3663 provides two status monitor pins, STAT1 and
STAT2. These pins are open drain MOSFET switches
intended to directly drive external LEDs to indicate the
battery charging state. A third status pin is prided to


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