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參數(shù)資料
| 型號： | AAT3690 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger |
| 中文描述： | 安培USB接口/適配器鋰離子電池充電器 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 425K |
| 代理商： | AAT3690 |
AAT3690
1.0A USB Port/Adapter
Lithium-Ion/Polymer Battery Charger
16
3690.2007.01.1.2
Thermal Considerations
The AAT3690 is offered in a 3x3mm TDFN pack-
age which can provide up to 2.0W of power dissi-
pation when it is properly bonded to a printed cir-
cuit board and has a maximum thermal resistance
of 50°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:
Eq. 1:
Where:
P
D
V
IN
= Total power dissipation by the device
= Either V
ADP
or V
USB
, depending on which
mode is selected
V
BAT
= Battery voltage as seen at the BAT pin
I
CC
= Maximum constant fast charge current pro-
grammed for the application
I
OP
= Quiescent current consumed by the charg-
er IC for normal operation
Next, the maximum operating ambient temperature
for a given application can be estimated based on
the thermal resistance of the 3x3 TDFN package
when sufficiently mounted to a PCB layout and the
internal thermal loop temperature threshold.
Eq. 2:
Where:
T
A
T
J
= Ambient temperature in degrees C
= Maximum device junction temperature
below the thermal loop threshold
P
D
θ
JA
= Total power dissipation by the device
= Package thermal resistance in °C/W
Example:
For an application where the fast charge current for
the adapter mode is set to 0.75A, V
ADP
= 5.0V, and
the worst case battery voltage is 3.6V, what is the
maximum ambient temperature where the thermal
limiting will become active
Given:
V
ADP
= 5.0V
V
BAT
= 3.6V
I
CC
= 0.75A
I
OP
= 0.75mA
T
J
= 110°C
θ
JA
= 50°C/W
Using Equation 3, calculate the device power dissi-
pation for the stated condition:
Eq. 3:
The maximum ambient temperature before the
AAT3690 thermal loop becomes active can now be
calculated using Equation 4:
Eq. 4:
Therefore, under the stated conditions for this
worst case power dissipation example, the
AAT3690 will enter the thermal loop and lower the
fast charge constant current when the ambient
operating temperature rises above 24.8°C.
T
A
= 110
°
C - (50
°
C/W · 1.05375W)
= 57.3125
°
C
P
D
= (5.0V - 3.6V)(0.75A) + (5.0V · 0.75mA)
= 1.05375W
T
A
= T
J
- (
θ
JA
· P
D
)
P
D
= [(V
IN
- V
BAT
) · I
CC
+ (V
IN
· I
OP
)]
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3690IWP-4.2-T1 | 制造商:Advanced Analogic Tech 功能描述:AAT3690 Series 4 - 5.5 V 1A USB Port/Adapter Lithium-Ion/Polymer Battery Charger 制造商:SKYWORKS SOLUTIONS 功能描述:AAT3690 Series 4 - 5.5 V 1A USB Port/Adapter Lithium-Ion/Polymer Battery Charger 制造商:Skyworks Solutions Inc 功能描述:POWER MANAGEMENT IC |
| AAT3691IRN-4.2-T1 | 制造商:SKYWORKS SOLUTIONS 功能描述:AAT3691 Series 1.6 A 28 V Dual Input 1.6 A Linear Charger - TDFN-16 |
| AAT3692IRN-4.2-T1 | 功能描述:電池管理 2 Input 1.6A Linear Chrg w/28V OVP RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| aat3693idh-aa-db1 | 制造商:Skyworks Solutions Inc 功能描述:AAT3693 Series 1.6 A Lithium-Ion/Polymer Battery Charger Eval Board |
| AAT3693IDH-AA-T1 | 功能描述:電池管理 Lithium-Ion/Polymer Batt Charger 1.6A RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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