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參數(shù)資料
| 型號： | AAT2505IWP-AQ-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Dual Channel, Step-Down Converter/Linear Regulator |
| 中文描述： | 雙通道，降壓轉(zhuǎn)換器/線性穩(wěn)壓器 |
| 文件頁數(shù)： | 20/26頁 |
| 文件大?。?/td> | 854K |
| 代理商： | AAT2505IWP-AQ-T1 |
AAT2505
Dual Channel, Step-Down
Converter/Linear Regulator
20
2505.2006.06.1.1
Step-Down Converter Design Example
Specifications
V
OBUCK
= 1.8V @ 400mA (adjustable using 0.6V version), Pulsed Load
Δ
I
LOAD
= 300mA
V
OLDO
= 3.3V @ 300mA
V
IN
= 2.7V to 4.2V (3.6V nominal)
F
S
= 1.4MHz
T
AMB
= 85°C
1.8V Buck Output Inductor
(use 4.7μH; see Table 1)
For Sumida inductor CDRH3D16, 4.7μH, DCR = 105m
Ω
.
1.8V Buck Output Capacitor
V
DROOP
= 0.1V
1
2
3
1
1.8V · (4.2V - 1.8V)
4.7
μ
H · 1.4MHz · 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 · 1.4MHz
C
OUT
=
=
= 6.4
μ
F; use 10
μ
F
· = 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
= L1
1 - V
F
S
IN
4.7
μ
H
1.4MHz 1 - = 156mA
4.2V
I
PKL1
= I
O
+
Δ
I
L1
= 0.4A + 0.068A = 0.468A
2
P
L1
= I
O
2
DCR = 0.4A
2
105m
Ω
= 17mW
L1 = 3 A
V
O2
= 3 A
1.8V = 5.4μH
μsec
μsec
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