Advanced Analog Technology, Inc.
AAT8635 Series
standby mode right after the battery pack is
connected to a charger.
The conditions of over current and short circuit
protection are both determined by the voltage at
the VN pin. As the voltage of VN pin reaches a
value higher than
V
OC
, which indicates an
undesirable large current is flowing through the
path, D
OUT
will be switched to low and the path
is cut-off right after an internally pre-set delay
time ( t
OC
) elapses. In the case of short circuit, i.e.
VN rises above V
short
, the path will also be cut-off
but with almost no delay time. Once the over
current or factors contributing to short circuit is
removed, the built-in resistor at the VN pin,
typically 100
k
Ω
, will pull VN down to GND and
bring the IC back to standard operation.
Together with the application circuit, the
AAT8635 series will function as a consummate
protector, which promotes safe usage and the
sustainability of Li-Ion battery packs.
BLOCK DIAGRAM
V
DD
C
ext
C
OUT
GND
D
OUT
VN
–
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–
–
Advanced Analog Technology, Inc
.
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