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參數(shù)資料
| 型號(hào)： | AAT1157 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 1MHz 1.2A Buck DC/DC Converter |
| 中文描述： | 1MHz的1.2A的降壓DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 394K |
| 代理商： | AAT1157 |
AAT1157
1MHz 1.2A Buck DC/DC Converter
1157.2005.11.1.4
11
Design Example
Specifications
I
OUT
1.2A
I
RIPPLE
330mA
V
OUT
2.5V
V
IN
3.0V to 4.2V
F
S
1MHz
T
AMB
= 85°C
Maximum Input Capacitor Ripple:
Inductor Selection:
Select Sumida inductor CDRH5D28 3.0μH.
Output Capacitor Ripple Current:
1
2
3
1
2.5V · (4.2V - 2.5V)
3.0
H · 1MHz · 4.2V
2
3
RMS
I
IN
L F V
=
·
· ·
·
· = 97.4mArms
·
(V
OUT
) · (V
IN
- V
OUT
)
=
Pesr = esr · I
RMS2
= 5m
· (97.4mA)
2
= 47.4
μ
W
V
V
2.5
V
2.5V
I = L
1 - V
1- 4.2V
F
IN
3.0
μ
H
1MHz
I
PK
= I
OUT
+
I = 1.2A + 0.17A = 1.37A
2
P = I
O
2
DCR = (1.2A)
2
31m
= 45mW
V
V
2.5
V
2.5V
L =
1 - =
1 - = 3.07
μ
H
I
PP
F
V
IN
0.33A
1MHz
4.2V
1
0.59Arms
O
RMS
I
O
IN
IN
V
V
I
V
V
=
· ·
-
=
P = esr
·
I
RMS
2
= 5m
·
0.59
2
A = 1.7mW
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