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參數(shù)資料
| 型號： | AAT1157IVN-T1 |
| 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)： | 10/14頁 |
| 文件大?。?/td> | 394K |
| 代理商： | AAT1157IVN-T1 |
AAT1157
1MHz 1.2A Buck DC/DC Converter
10
1157.2005.11.1.4
Where I
Q
is the AAT1157 quiescent current.
Once the total losses have been determined, the
junction temperature can be derived from the
θ
JA
for
the QFN package. Close attention should be paid to
the proper layout for the QFN package. Proper size
and placement of thermal routing vias below the
central paddle is necessary for good heat transfer to
other PCB layers and their ground planes. The
θ
JA
for the QFN package with no connection to the cen-
tral paddle is 50°C/W. The actual
θ
JA
will vary with
the number and type of vias. The PCB board size,
number of board layers, and ground plane charac-
teristics also influence the
θ
JA
. A good thermal con-
nection from the paddle to the PCB ground plane
layers can significantly reduce
θ
JA
.
Adjustable Output
Resistors R3 and R4, as shown in Figure 1, force
the output to regulate higher than the 0.6V refer-
ence voltage level. The optimum value for R4 is
59k
. Values higher than this can cause stability
problems, while lower values can degrade light
load efficiency. For a 2.5V output with R4 set to
59k
, R3 is 187k
.
Table 1: Suggested Component Values.
Buck-Boost Output
Figure 4 shows how to configure the AAT1157 in a
buck boost configuration with an external MOSFET
and Schottky diode. The converter has a 3.3V
600mA output with an input voltage ranging from
2.7V to 5.5V.
Output
Voltage
(V)
0.8
1.0
1.2
1.5
1.8
2.5
3.3
Output
Capacitor
(C3-C4) (μF)
3x 22
2x 22
2x 22
2x 22
2x 22
2x 22
22
R3 for
R4 = 59k
(k
)
19.6
39.2
59
88.7
118
187
267
L1
(μH)
1.5 - 2.6
1.5 - 3.3
2.2 - 3.3
2.2 - 4.7
3.0 - 4.7
3.0 - 4.7
2.2 - 4.7
R3 = V
·
R4 = 0.6V
·
59k
= 187k
REF
V
O
2.5V
T
J
=
P ·
Θ
JA
+ T
AMB
I
2
(
R
V
+ R
(
V
- V
))
P =
V
IN
+ (t
sw
F
I
O
V
IN
+ I
Q
)
V
IN
Figure 4: AAT1157 Buck Boost Converter.
3.0
μ
H
L1
22
μ
F
C1
100
R1
0.1
μ
F
C2
μ
F 10V X7R 1210 GRM32ER71A226KE20L
C3,C4 MuRata 22
μ
F 6.3V X5R 0805 GRM21BR60J226ME39L
C1 Murata 22
LX
14
N/C
6
EN
7
VCC
9
VP
10
N/C
8
LX
13
PGND
PGND
PGND
3
VP
12
VP
11
OUT
4
LX
15
2
1
SGND
5
N/C
16
AAT1157
U1
267k
R2
59.0k
R3
Si2302ADS
Q1
MBRM120L
D1
2x 22
μ
F
C3,C4
V
IN
2.7V to 5.5V
V
O
3.3V/600mA
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