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參數(shù)資料
| 型號： | AAT1153IDE-1.8-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 2A Step-Down Converter |
| 中文描述： | 第2A降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 689K |
| 代理商： | AAT1153IDE-1.8-T1 |
AAT1153
2A Step-Down Converter
PRODUCT DATASHEET
1153.2007.11.1.1
17
w w w . a n a l o g i c t e c h . c o m
Step-Down Converter Design Example
Specifications
V
O
= 1.8V @ 2A
V
IN
= 2.7V to 4.2V (3.6V nominal)
f
S
= 1.2MHz
Transient droop = 200mV
V
O
= 50mV
1.8V Output Inductor
V
· (V
- V
)
V
IN(MAX)
I
L
f
OSC
1.8 · (4.2 - 1.8)
4.2
0.6 · 1.2 · 10
6
L = = = 1.4μH
Δ
I
L
= 30%
I
O
= 0.3 · 2 = 600mA
For Sumida 2.2
μ
H inductor (CDRH2D14) with DCR 75m
Ω
, the
I
L
should be
V
V
IN
0.395
2
Δ
I
L
= L
1 - V
I
PKL
= I
O
+
Δ
I
L
= 2 + = 2.2A
2
P
L
= I
O
2
DCR = 2
2
0.0287 = 114.8mW
1.8V Output Capacitor
3 ·
Δ
I
LOAD
V
DROOP
· f
S
3 · 1.2
0.2 · 1.2 · 10
6
C
OUT
=
=
= 25μF; use 22μF
ESR
≤
= = 0.13
Ω
I
L
V
0.05
0.395
Select a 22
μ
F, 10m
Ω
ESR ceramic capacitor to meet the ripple 50mV requirement.
V
· (V
- V
)
V
IN
· f
OSC
· L
1
8 · f
OSC
· C
OUT
Δ
V
OUT
≤
· ESR +
1.8 · (4.2 - 1.8)
= · 0.01 +
4.2 · 1.2 ·
10
6
· 2.2 ·
10
-6
1
8 · 1.2 ·
10
6
· 22 ·
10
-6
= 5.7mV
I
RMS
=
Δ
I
L
·0.289 = 0.395 · 0.289 = 114mArms
P
COUT
= ESR · I
RMS2
= 0.01 · 1
2
= 10mW
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