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參數(shù)資料
| 型號： | AAT1156_07 |
| 廠商： | Advanced Analog Technology,lnc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1MHz 700mA Step-Down DC-DC Converter |
| 中文描述： | 1MHz的700mA的降壓型DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 586K |
| 代理商： | AAT1156_07 |
AAT1156
1MHz 700mA Step-Down DC-DC Converter
1156.2007.01.1.4
13
Output Capacitor Ripple Current:
AAT1156 Dissipation:
Figure 5: 0.8V Solution.
Efficiency vs. Load Current
(V
OUT
= 0.8V; L = 2.2μH)
Output Current (mA)
E
20
30
40
50
60
70
80
90
100
1
10
100
1000
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
2.2
μ
H
L1
2 x 22
μ
F
C3, C4
10
μ
F
C1
100
R1
0.1
μ
F
C2
C1 Murata 10
F 6.3V X5R GRM42-6X5R106K6.3
C3, C4 MuRata 22
F 6.3V GRM21BR60J226ME39L X5R 0805
L1 Sumida CDRH3D16-2R2NC
0.8V
INPUT
19.6k
R3
59k
R4
LL
EN
VCC
VP
N/C
VP
VP
SGND
PGND
LX
N/C
LX
PGND
FB
LX
PGND
AAT1156
U1
T
J(MAX)
= T
AMB
+
Θ
JA
P
LOSS
= 85
°
C + 50
°
C/W 0.141W = 92
°
C
P
TOTAL
+ (t
sw
F
S
I
O
+ I
Q
) V
IN
I
O
2
(R
DS(ON)H
V
O
+ R
DS(ON)L
(V
IN
-V
O
))
V
IN
=
=
+ (20nsec 1MHz 0.7A + 300
μ
A) 4.2V = 0.141W
(0.7A)
2
(0.17
Ω
2.5V + 0.16
Ω
(4.2V - 1.5V))
4.2V
1
2
3
1
2.5V · (4.2V - 2.5V)
4.7
H · 1MHz · 4.2V
2
3
RMS
I
L · F
S
· V
IN
=
·
·
· = 62mArms
·
V
OUT
· (V
IN
- V
OUT
)
=
Pesr = esr · I
RMS2
= 5m
Ω
· (62 mA)
2
= 19
μ
W
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