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參數(shù)資料
| 型號(hào)： | AAT3681IJS-4.2-1-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger |
| 中文描述： | USB端口或AC適配器鋰離子電池充電器 |
| 文件頁(yè)數(shù)： | 13/15頁(yè) |
| 文件大?。?/td> | 329K |
| 代理商： | AAT3681IJS-4.2-1-T1 |
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Where:
P
D
V
IN
V
BAT
= Battery Voltage as Seen at the BAT Pin
I
CH
= Constant Charge Current Programmed for
the Application
= Total Power Dissipation by the Device
= Input Voltage
I
OP
= Quiescent Current Consumed by the
Charger IC for Normal Operation [0.5mA]
By substitution, we can derive the maximum
charge current before reaching the thermal limit
condition (thermal cycling). The maximum charge
current is the key factor when designing battery
charger applications.
In general, the worst condition is the greatest volt-
age drop across the charger IC, when battery volt-
age is charged up to the preconditioning voltage
threshold. Figure 4 shows the maximum charge
current in different ambient temperatures.
Figure 4: Maximum Charging Current Before
Thermal Cycling Becomes Active.
Capacitor Selection
Input Capacitor
In general, it is good design practice to place a
decoupling capacitor between the ADP pin and
GND. An input capacitor in the range of 1μF to
22μF is recommended. If the source supply is
unregulated, it may be necessary to increase the
capacitance to keep the input voltage above the
under-voltage lockout threshold during device
enable and when battery charging is initiated. If the
AAT3681 adapter input is to be used in a system
with an external power supply source, such as a
typical AC-to-DC wall adapter, then a C
IN
capacitor
in the range of 10μF should be used. A larger input
capacitor in this application will minimize switching
or power transient effects when the power supply is
"hot plugged" in.
Output Capacitor
The AAT3681 only requires a 1μF ceramic capaci-
tor on the BAT pin to maintain circuit stability. This
value should be increased to 10μF or more if the
battery connection is made any distance from the
charger output. If the AAT3681 is to be used in
applications where the battery can be removed
from the charger, such as with desktop charging
cradles, an output capacitor greater than 10μF may
be required to prevent the device from cycling on
and off when no battery is present.
Printed Circuit Board Layout
Considerations
For the best results, it is recommended to physically
place the battery pack as close as possible to the
AAT3681 BAT pin. To minimize voltage drops on the
PCB, keep the high current carrying traces ade-
quately wide. Refer to the AAT3681 evaluation board
for a good layout example (see Figures 5 and 6).
V
IN
(V)
I
C
0
50
100
150
200
250
300
4.25
4.5
4.75
5
5.25
5.5
5.75
6
6.25
6.5
6.75
T
A
= 25
°
C
T
A
= 60
°
C
T
A
= 85
°
C
T
A
= 45
°
C
(T
J(MAX)
-
T
A
)
JA
=
IN
- V
BAT
I
CH(MAX)
-
V
IN
·
I
OP
(P
D(MAX)
-
V
IN
·
I
OP
)
V
IN
- V
BAT
I
CH(MAX)
=
AAT3681
USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
3681.2007.01.1.2
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3683IOQ-4.2-2-DB1 | 制造商:Skyworks Solutions Inc 功能描述:AAT3683 Series 1 A Linear Li-Ion Battery Charger Evaluation Board |
| AAT3683IOQ-4.2-2-T1 | 制造商:Skyworks Solutions Inc 功能描述:IC BATT CHARGER 1A LI ION 制造商:Skyworks Solutions Inc 功能描述:POWER MANAGEMENT IC |
| AAT3683IOQ-4.2-3-T1 | 制造商:Skyworks Solutions Inc 功能描述:AAT3683 Series 7.5 V 1 A Linear Li-Ion Battery Charger - STDFN-10 |
| AAT3683IVN-4.2-4-T1 | 制造商:Skyworks Solutions Inc 功能描述:POWER MANAGEMENT IC |
| AAT3684IOQ-4.2-1-T1 | 制造商:Skyworks Solutions Inc 功能描述:AAT3684 Series 6.5V 500mA Lithium-Ion / Polymer Battery Charger -STDFN2.2x2.2-10 |
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