參數(shù)資料
型號： AAT1155_06
廠商： Advanced Analog Technology,lnc.
英文描述： 1MHz 2.5A Step-Down DC/DC Converter
中文描述： 1MHz的2.5A降壓型DC / DC轉換器
文件頁數(shù)： 14/17頁
文件大?。?/td> 532K
代理商： AAT1155_06
AAT1155
1MHz 2.5A Step-Down DC/DC Converter
14
1155.2006.09.1.7
AAT1155 Junction Temperature
Diode
Given an ambient thermal resistance of 120°C/W
from the manufacturer's datasheet, T
J(MAX)
of the
diode is:
Output Capacitor
The output capacitor value required for sufficient
loop phase margin depends on the type of capaci-
tor selected. For a low ESR ceramic capacitor, a
minimum value of 200μF is required. For a low
ESR tantalum capacitor, lower values are accept-
able. While the relatively higher ESR associated
with the tantalum capacitor will give more phase
margin and a more dampened transient response,
the output voltage ripple will be higher.
The 120μF Vishay 594D tantalum capacitor has an
ESR of 85m
Ω
and a ripple current rating of 1.48Arms
in a C case size. Although smaller case sizes are suf-
ficiently rated for this ripple current, their ESR level
would result in excessive output ripple.
The ESR requirement for a tantalum capacitor can
be estimated by :
Two or three 1812 X5R 100μF 6.3V ceramic
capacitors in parallel also provide sufficient phase
margin. The low ESR and ESL associated with
ceramic capacitors also reduces output ripple sig-
nificantly over that seen with tantalum capacitors.
Temperature rise due to ESR ripple current dissi-
pation is also reduced.
Input Capacitor
The input capacitor ripple is:
In the examples shown, C1 is a ceramic capacitor
located as closely to the IC as possible. C1 pro-
vides the low impedance path for the sharp edges
associated with the input current. C4 may or may
not be required, depending upon the impedance
characteristics looking back into the source. It
serves to dampen any input oscillations that may
arise from a source that is highly inductive. For
most applications, where the source has sufficient
bulk capacitance and is fed directly to the AAT1155
through large PCB traces or planes, it is not
required. When operating the AAT1155 evaluation
board on the bench, C4 is required due to the
inductance of the wires running from the laborato-
ry power supply to the evaluation board.
1
1.82Arms
O
RMS
I
O
IN
IN
V
V
I
V
V
=
· ·
-
=
100
111
0.9A
V
≤
=
mV
ESR
m
Ω
I
=
1
2
3
1
3.65
1.7
·
240
1.5
μ
· 1
5
2
3
RMS
I
V
V
mArms
H
MHz
V
=
·
=
·
·
=
·
·
(V
OUT
+ V
F
) · (V
IN
+ V
OUT
)
L · F
S
· V
IN
J(MAX)
T
70
120
/
0.33W
109
AMB
T
JA
P
C
° +
°
C W
°
C
=
+
Θ
=
·
=
·
= 0.35
0.93
0.33A
V
A
·
=
P
DIODE
= V
FW
·
I
DIODE
1
3.3
2.5A 1
5.25V
O
DIODE
I
O
IN
V
I
V
V
=
·
-
=
·
-
= 0.93A
0.35
FW
V
V
=
690
0.42
ON
IN
IN
P
V
V
A
5V
2
Watts
=
+
+ I
Q
·
=
+
+
·
= 70
°
C + 150
°
C/W · 0.42W = 133
°
C
I
O
2
· R
DS(ON)
· V
O
2.5
2
· 70m
Ω
· 3.3V
20ns · 1MHz · 2.5A
μ
T
J(MAX)
= T
AMB
+
θ
JA
· P
t
SW
· F
S
· I
O
2
相關PDF資料
PDF描述
AAT1155IKS-1.0-T1 1MHz 2.5A Step-Down DC/DC Converter
AAT1155IKS-1.8-T1 1MHz 2.5A Step-Down DC/DC Converter
AAT1155IKS-2.5-T1 1MHz 2.5A Step-Down DC/DC Converter
AAT1155IKS-3.3-T1 1MHz 2.5A Step-Down DC/DC Converter
AAT1156 1MHz 700mA Step-Down DC-DC Converter
相關代理商/技術參數(shù)
參數(shù)描述
AAT1155IKS-1.0-T1 制造商:SKYWORKS SOLUTIONS 功能描述:AAT1155 Series 5.5 V 1 MHz 2.5 A SMT Step-Down DC/DC Converter - MSOP-8 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER
AAT1155IKS-1.8-T1 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz 2.5A Step-Down DC/DC Converter
AAT1155IKS-2.5-T1 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz 2.5A Step-Down DC/DC Converter
AAT1155IKS-3.3-T1 制造商:SKYWORKS SOLUTIONS 功能描述:AAT1155 Series 5.5 V 1 MHz 2.5 A SMT Step-Down DC/DC Converter - MSOP-8
AAT1156 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz 700mA Step-Down DC-DC Converter
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*