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參數(shù)資料
| 型號： | AAT1149 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 3MHz Fast Transient 400mA Step-Down Converter |
| 中文描述： | 3MHz的快速瞬態(tài)400mA的降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大小： | 1800K |
| 代理商： | AAT1149 |
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
14
1149.2006.11.1.0
Dissipation due to the RMS current in the ceramic
output capacitor ESR is typically minimal, resulting in
less than a few degrees rise in hot-spot temperature.
Feedback Resistor Selection
Resistors R1 and R2 of Figure 4 program the output
to regulate at a voltage higher than 0.6V. To limit the
bias current required for the external feedback resis-
tor string while maintaining good noise immunity, the
minimum suggested value for R2 is 59k
Ω
. Although
a larger value will further reduce quiescent current, it
will also increase the impedance of the feedback
node, making it more sensitive to external noise and
interference. Table 2 summarizes the resistor values
for various output voltages with R2 set to either 59k
Ω
for good noise immunity or 221k
Ω
for reduced no
load input current.
The AAT1149, combined with an external feedfor-
ward capacitor (C3 in Figure 4), delivers enhanced
transient response for extreme pulsed load appli-
cations. The addition of the feedforward capacitor
typically requires a larger output capacitor C1 for
stability.
Table 2: Feedback Resistor Values.
R2 = 59k
Ω
R1 (k
Ω
)
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
R2 = 221k
Ω
R1
V
OUT
(V)
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
113K
150K
187K
221K
261K
301K
332K
442K
464K
523K
715K
1.00M
R1 = V
·
R2 = 0.6V
·
59k
Ω
= 88.5k
Ω
REF
V
OUT
1.5V
Figure 4: AAT1149 Evaluation Board Schematic.
L1
4.7
μ
F
C1
4.7
μ
F
C2
V
OUT
V
IN
GND
GND
1
2
3
Enable
LX
EN
1
OUT
2
IN
3
LX
4
AGND
5
PGND
6
PGND
7
PGND
8
AAT1149
U1
R1
59k
R2
C3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AAT1149AIUV-1.875-T1 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2.2MHz Fast Trans 400mA StepDown Cnvrt RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| AAT1149B | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:2.2MHz Fast Transient 400mA Step-Down Converter |
| AAT1149BIUV-1.8-T1 | 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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