參數(shù)資料
型號(hào)： AAT3682
廠商： Advanced Analogic Technologies, Inc.
英文描述： Lithium-Ion/Polymer Linear Battery Charger
中文描述： 鋰離子線性電池充電器
文件頁(yè)數(shù)： 13/18頁(yè)
文件大?。?/td> 233K
代理商： AAT3682
Protection Circuitry
The AAT3682 is a highly integrated battery manage-
ment system IC including several protection fea-
tures. In addition to battery temperature monitoring,
the IC constantly monitors for over-current and over-
voltage conditions; if an over-current situation
occurs, the AAT3682 latches off the pass device to
prevent damage to the battery or the system, and
enters shutdown mode until the over-current event is
terminated. An over-voltage condition is defined as a
condition where the voltage on the BAT pin exceeds
the maximum battery charge voltage. If an over-volt-
age condition occurs, the IC turns off the pass
device until voltage on the BAT pin drops below the
maximum battery charge constant voltage threshold.
The AAT3682 will resume normal operation after the
over-current or over-voltage condition is removed.
During an over-current or over-voltage event, the
STAT will report a FAULT signal. In the event of a
battery over-temperature condition, the IC will turn
off the pass device and report a FAULT signal on the
STAT pin. After the system recovers from a temper-
ature fault, the IC will resume operation in the 1X
trickle charge mode to prevent damage to the sys-
tem in the event a defective battery is placed under
charge. Once the battery voltage rises above the
trickle charge to constant current charge threshold,
the IC will resume the constant current mode.
Applications Information
Choosing a Sense Resistor
The charging rate recommended by Lithium-Ion
cell vendors is normally 1C, with a 2C absolute
maximum rating. Charging at the highest recom-
mended rate offers the advantage of shortened
charging time without decreasing the battery's lifes-
pan. This means that the suggested fast charge
rate for a 500mAH battery pack is 500mA. Refer to
the Safe Operating Area curves in the Typical
Characteristics section of this datasheet to deter-
mine the maximum allowable charge current for a
given input voltage. The current sense resistor,
R
SENSE
, programs the charge current according to
the following equation:
Where I
CHARGE
is the desired typical charge current
during constant-current charge mode. V
CC
- V
CSI
is
the voltage across R
SENSE
, shown in the Electrical
Characteristic table as V
CS
. To program a nominal
500mA charge current during fast-charge, a
200m
value resistor should be selected.
V
- V
CHARGE
R
SENSE
= I
AAT3682
Lithium-Ion/Polymer Linear Battery Charger
3682.2005.02.1.1
13
Figure 5: Evaluation Board Schematic.
1
2
J1
GND
1
2
3
J2
1K
R4
0.2
R2
1K
R3
2.2K
R1
100K
R6
100K
R5
D2
22
μ
F
C1
10
μ
F
C2
Green LED
V
IN
D1
47nF
C3
TS
N/C
N/C
STAT
1
2
3
4
V
5
D
6
T
7
N
8
BAT
9
10
VSS
11
N/C
12
V
1
C
1
B
1
V
1
AAT3682
U1
100K
R7
2
1
3
SW-T2X
S1
1000pF
C4
4.7
μ
F
C5
Remove capacitor for
progressive dimming
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