參數(shù)資料
型號(hào): AAT1123IJS-1.2-T1
廠商: Advanced Analog Technology,lnc.
英文描述: 1MHz Step-Down Converter
中文描述: 1MHz的降壓轉(zhuǎn)換器
文件頁(yè)數(shù): 15/20頁(yè)
文件大?。?/td> 568K
代理商: AAT1123IJS-1.2-T1
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
= 1.0MHz
T
AMB
= 85°C
1.8V Output Inductor
(see Table 1)
For Sumida inductor CDRH3D16, 4.7μH, DCR = 105m
Ω
.
1.8V Output Capacitor
V
DROOP
= 0.05V
1
2
3
1
1.8V · (4.2V - 1.8V)
4.7
H · 1.0MHz · 4.2V
2
3
RMS
I
L1 · F · V
IN(MAX)
= ·
·
3 ·
Δ
I
LOAD
V
DROOP
· F
S
3 · 0.3A
0.05V · 1MHz
C
OUT
=
=
= 18.0
μ
F
· = 63mArms
·
(V
O
) · (V
IN(MAX)
- V
O
)
=
P
esr
= esr · I
RMS2
= 5m
Ω
· (63mA)
2
= 20
μ
W
V
V
1.8
V
1.8V
Δ
I
L1
= L1
1 - V
F
IN
4.7
μ
H
1.0MHz 1 - = 218mA
4.2V
I
PKL1
= I
O
+
Δ
I
L1
= 0.4A + 0.11A = 0.51A
2
P
L1
= I
O
2
DCR = 0.4A
2
105m
Ω
= 17mW
L1 = 3 A
V
O2
= 3 A
1.8V = 5.4
μ
H
μ
sec
μ
sec
AAT1123
1MHz Step-Down Converter
1123.2007.02.1.6
15
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