- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375166 > AAT3183 (Advanced Analogic Technologies, Inc.) 300mA Inductorless Step-Down Converter PDF資料下載
參數(shù)資料
| 型號： | AAT3183 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 300mA Inductorless Step-Down Converter |
| 中文描述： | 300mA的電感降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 392K |
| 代理商： | AAT3183 |
AAT3183
300mA Inductorless Step-Down Converter
14
3183.2007.07.1.2
Thermal Performance
Power de-rating of the AAT3183 is not necessary in
most cases due to the low thermal resistance of the
SC70JW-8 package, and the limited device losses.
Under operating conditions V
OUT
= 1.5V and I
OUT
=
300mA, the estimated worst-case operating effi-
ciency (η) is 68% (V
IN
= 4.2V).
Device power dissipation (P
D
) can be estimated:
The typical junction-to-ambient thermal resistance
(R
θ
JA
) of a SC70JW-8 package mounted on an FR4
board is 160oC/W. The maximum junction temper-
ature (T
J(MAX)
) of the device at 85oC ambient is esti-
mated: This is below the maximum recommended
device junction temperature of 125oC.
PCB Layout Guidelines
Proper circuit board layout will maximize efficiency
while minimizing switching noise and EMI. The fol-
lowing guidelines should be observed when
designing the printed circuit board layout for the
AAT3183 step-down converter:
1. Place the three external capacitors as close to
the AAT3183 device as possible. Maintain the
circuit board traces as short and wide as pos-
sible. This will minimize noise resulting from
parasitic ESR and ESL in the AC current path.
2. Maintain short and wide traces from ground
plane to circuit nodes. This will minimize stray
parasitics.
3. A good example of an optimal layout for the
AAT3183 is the AAT3183 evaluation board
shown in Figures 4 and 5. The evaluation board
schematic is shown in Figure 6.
T
J(MAX)
= T
AMB(MAX)
+ (P
D
· R
θ
JA
)
= 85oC + (211.8mW · 160
°
C/W)
= 119
°
C
= V
OUT
· I
OUT
·
(1 -
η
)
η
= 1.5V · 0.3A ·
= 211.8mW
(1 - 0.68)
0.68
=
- P
OUT
P
D
= P
IN
- P
OUT
P
OUT
η
= V
OUT
· I
OUT
)
(V
IN
· I
IN
)
η
= P
OUT
P
IN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT3183IJS-1.5-T1 | 300mA Inductorless Step-Down Converter |
| AAT3190 | Positive/Negative Charge Pump for Voltage Bias |
| AAT3190IKS-T1 | Positive/Negative Charge Pump for Voltage Bias |
| AAT3190ITP-1-T1 | Positive/Negative Charge Pump for Voltage Bias |
| AAT3190ITP-T1 | Positive/Negative Charge Pump for Voltage Bias |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3183_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA Inductorless Step-Down Converter |
| AAT3183IJS-1.34-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA Inductorless Step-Down Converter |
| AAT3183IJS-1.5-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT3190 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Positive/Negative Charge Pump for Voltage Bias |
| AAT3190_06 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Positive/Negative Charge Pump for Voltage Bias |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。