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參數(shù)資料
| 型號： | AAT1147 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | High Efficiency, Low Noise, Fast Transient 400mA Step-Down Converter |
| 中文描述： | 高效率，低噪聲，快速瞬態(tài)400mA的降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/19頁 |
| 文件大小： | 620K |
| 代理商： | AAT1147 |
For the condition where the step-down converter is
in dropout at 100% duty cycle, the total device dis-
sipation reduces to:
Since R
DS(ON)
, quiescent current, and switching
losses all vary with input voltage, the total losses
should be investigated over the complete input
voltage range.
Given the total losses, the maximum junction tem-
perature can be derived from the
θ
JA
for the
SC70JW-8 package which is 160°C/W.
Layout
The suggested PCB layout for the AAT1147 is
shown in Figures 2, 3, and 4. The following guide-
lines should be used to help ensure a proper layout.
1. The input capacitor (C2) should connect as
closely as possible to V
IN
(Pin 3) and PGND
(Pins 6-8).
2. C1 and L1 should be connected as closely as
possible. The connection of L1 to the LX pin
should be as short as possible.
3. The feedback trace or OUT pin (Pin 2) should
be separate from any power trace and connect
as closely as possible to the load point.
Sensing along a high-current load trace will
degrade DC load regulation. External feedback
resistors should be placed as closely as possi-
ble to the OUT pin (Pin 2) to minimize the
length of the high impedance feedback trace.
4. The resistance of the trace from the load return
to the PGND (Pins 6-8) should be kept to a
minimum. This will help to minimize any error in
DC regulation due to differences in the poten-
tial of the internal signal ground and the power
ground.
A high density, small footprint layout can be
achieved using an inexpensive, miniature, non-
shielded, high DCR inductor. An evaluation board
is available with this inductor and is shown in
Figure 6. The total solution footprint area is 40mm
2
.
Figure 6: Minimum Footprint Evaluation Board
Using 2.0mm x 1.6mm x 0.95mm Inductor.
T
J(MAX)
=
P
TOTAL
·
Θ
JA
+ T
AMB
P
TOTAL
= I
O
2
· R
DSON(H)
+ I
Q
· V
IN
AAT1147
High Efficiency, Low Noise, Fast Transient
400mA Step-Down Converter
14
1147.2006.05.1.0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1147IJS-0.6-DB1 | 制造商:Skyworks Solutions Inc 功能描述:Evaluation Board for AAT1147 High Efficiency Step-Down Converter |
| AAT1147IJS-0.6-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency, Low Noise, Fast Transient 400mA Step-Down Converter |
| AAT1149 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:3MHz Fast Transient 400mA Step-Down Converter |
| AAT1149_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:3MHz Fast Transient 400mA Step-Down Converter |
| AAT1149A | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:2.2MHz Fast Transient 400mA Step-Down Converter |
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