參數(shù)資料
型號(hào)： AAT1141
廠商： Advanced Analogic Technologies, Inc.
英文描述： Fast Transient 600mA Step-Down Converter
中文描述： 快速的瞬時(shí)600mA降壓轉(zhuǎn)換器
文件頁數(shù)： 16/19頁
文件大?。?/td> 951K
代理商： AAT1141
AAT1141
Fast Transient 600mA Step-Down Converter
SwitchReg
TM
PRODUCT DATASHEET
16
1141.2007.12.1.3
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 @ 600mA (adjustable using 0.6V version), Pulsed Load
Δ
I
LOAD
= 300mA
V
IN
= 2.7V to 4.2V (3.6V nominal)
F
S
= 1.4MHz
T
AMB
= 85°C
1.8V Output Inductor
L1 = 3 A
V
O2
= 3 A
1.8V = 5.4
μ
H
μ
sec
μ
sec
(use 4.7
μ
H; see Table 1)
For Sumida inductor CDRH3D16, 4.7
μ
H, DCR = 105m
Ω
.
V
V
1.8
V
1.8V
Δ
I
L1
= L1
1 - V
F
IN
4.7
μ
H
1.4MHz 1 - = 156mA
4.2V
I
PKL1
= I
O
+
Δ
I
L1
= 0.6A + 0.068A = 0.668A
2
P
L1
= I
O
2
DCR = 0.6A
2
105m
Ω
= 38mW
1.8V Output Capacitor
V
DROOP
= 0.1V
1
2
3
1
1.8V · (4.2V - 1.8V)
4.7
H · 1.4MHz · 4.2V
2
3
RMS
I
L1 · F · 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 10μF
· = 45mArms
·
(V
O
) · (V
IN(MAX)
- V
O
)
=
P
esr
= esr · I
RMS2
= 5m
Ω
· (45mA)
2
= 10
μ
W
Input Capacitor
Input Ripple V
PP
= 25mV
C
IN
=
=
= 4.87μF; use 4.7μF
1
- ESR
·
4
·
F
S
V
PP
I
O
1
- 5m
Ω
·
4
·
1.4MHz
0.6A
25mV
I
O
2
RMS
I
P = esr
·
I
RMS
2
= 5m
Ω
·
(0.3A)
2
= 0.45mW
=
= 0.3Arms
相關(guān)PDF資料
PDF描述
AAT1141IGV-0.6-T1 Fast Transient 600mA Step-Down Converter
AAT1141IGV-1.8-T1 Fast Transient 600mA Step-Down Converter
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AAT1143IJS-0.6-T1 Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:5; Connector Shell Size:24; Connecting Termination:Solder; Circular Shell Style:Square Flange Receptacle; Body Style:Straight
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參數(shù)描述
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