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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)： | 16/20頁 |
| 文件大?。?/td> | 1800K |
| 代理商： | AAT1149 |
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
16
1149.2006.11.1.0
Step-Down Converter Design Example
Specifications
V
O
= 1.8V @ 400mA (adjustable using 0.6V version), Pulsed Load
Δ
I
LOAD
= 300mA
V
IN
= 2.7V to 4.2V (3.6V nominal)
F
S
= 3.0MHz
T
AMB
= 85°C
1.8V Output Inductor
(use 2.2
μ
H; see Table 1)
For Taiyo Yuden inductor CBC2518T2R2M, 2.2
μ
H, DCR = 130m
Ω
.
1.8V Output Capacitor
V
DROOP
= 0.1V
1
2
3
1
1.8V · (4.2V - 1.8V)
2.2
H · 3.0MHz · 4.2V
2
3
RMS
I
L1 · F
S
· V
IN(MAX)
= ·
·
3 ·
Δ
I
LOAD
V
DROOP
· F
S
3 · 0.3A
0.1V · 3.0MHz
C
OUT
=
=
= 3.0
μ
F; use 4.7μF
· = 45mArms
·
(V
O
) · (V
IN(MAX)
- V
O
)
=
P
esr
= esr · I
RMS2
= 5m
Ω
· (45mA)
2
= 10
μ
W
V
V
1.8
V
1.8V
Δ
I
L1
=
1 - =
1 - = 156mA
L1
F
S
V
IN
2.2
H
3.0MHz
4.2V
I
PKL1
= I
O
+
Δ
I
L1
= 0.4A + 0.078A = 0.478A
2
P
L1
= I
O
2
DCR = 0.4A
2
130m
Ω
= 21mW
L1 = 1 A
V
O
= 1 A
1.8V = 1.8
μ
H
μ
sec
μ
sec
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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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