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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大小： | 329K |
| 代理商： | AAT3681IJS-4.2-1-T1 |
AAT3681
USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
12
3681.2007.01.1.2
Charge Status Output
The AAT3681 provides battery charge status via a
status pin. This pin is internally connected to an N-
channel open drain MOSFET, which can be used to
drive an external LED. The status pin can indicate
the following conditions:
Table 2: LED Status Indicator.
The LED should be biased with as little current as
necessary to create reasonable illumination; there-
fore, a ballast resistor should be placed between
the LED cathode and the STAT pin. LED current
consumption will add to the overall thermal power
budget for the device package, hence it is good to
keep the LED drive current to a minimum. 2mA
should be sufficient to drive most low-cost green or
red LEDs. It is not recommended to exceed 8mA
for driving an individual status LED.
The required ballast resistor values can be esti-
mated using the following formulas:
Example:
Note: Red LED forward voltage (V
F
) is typically
2.0V @ 2mA.
Thermal Considerations
The AAT3681 is offered in a SC70JW-8 package
which can provide up to 687mW of power dissipa-
tion when it is properly bonded to a printed circuit
board and has a maximum thermal resistance of
160°C/W. Many considerations should be taken
into account when designing the printed circuit
board layout, as well as the placement of the
charger IC package in proximity to other heat gen-
erating devices in a given application design. The
ambient temperature around the charger IC will
also have an effect on the thermal limits of a bat-
tery charging application. The maximum limits that
can be expected for a given ambient condition can
be estimated by the following discussion.
First, the maximum power dissipation for a given
situation should be calculated:
Where:
P
D(MAX)
= Maximum Power Dissipation (W)
θ
JA
= Package Thermal Resistance (°C/W)
T
J(MAX)
= Maximum Device Junction Temperature
(°C) [135°C]
T
A
Figure 3 shows the relationship of maximum power
dissipation and ambient temperature of AAT3681.
= Ambient Temperature (°C)
Figure 3: Maximum Power Dissipation.
Next, the power dissipation can be calculated by
the following equation:
P
D
= [(V
IN
- V
BAT
)
·
I
CH
+ (V
IN
·
I
OP
)]
T
A
(
°
C)
P
D
0
200
400
600
800
1000
0
20
40
60
80
100
(T
J(MAX)
-
T
A
)
θ
JA
P
D(MAX)
=
(5.5V
- 2.0
V)
2mA
R
1
=
= 1.75k
Ω
(V
ADP
-
V
F(LED)
)
I
LED
R
1
=
Event Description
Status
No battery charging activity
Battery charging via adapter
or USB port
Charging completed
OFF
ON
OFF
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相關代理商/技術參數(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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