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參數(shù)資料
| 型號(hào)： | AAT1154IAS-1.0-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 1MHz 3A Buck DC/DC Converter |
| 中文描述： | 1MHz的第3A降壓DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大小： | 482K |
| 代理商： | AAT1154IAS-1.0-T1 |
AAT1154
1MHz 3A Buck DC/DC Converter
10
1154.2003.08.0.91
Current Limit and Over Temp
Protection
The AAT1154 over temp and current limit circuitry
protects the AAT1154 as well as the external
Schottky diode during overload, short circuit and
excessive ambient temperature conditions. The
junction over temp threshold is 140°C nominal and
has 15°C of hysteresis. Typical graphs of the over
temp load current vs. input voltage and ambient tem-
perature are shown in the Typical Characteristics
section.
Inductor
current to 20-40% of the full load current at the
maximum input voltage. Manufacturer's specifica-
tions list both the inductor DC current rating, which
is a thermal limitation, and the peak current rating,
which is determined by the inductor saturation
characteristics. The inductor should not show any
appreciable saturation under all normal load condi-
tions. During overload and short circuit conditions
the inductor can exceed its peak current rating
without affecting the converter performance. Some
inductors may have sufficient peak and average
current ratings yet result in excessive losses due to
a high DC resistance (DCR). The losses associat-
ed with the DCR and its affect on the total convert-
er efficiency must be considered.
For a 3 Amp load and the ripple current set to 30%
at the maximum input voltage, the maximum peak
to peak ripple current is 0.9Amp. Assuming a 5V ±
5% input voltage and 30% ripple the output induc-
tance required is
The factor "k" is the fraction of the full load (30%)
selected for the ripple current at the maximum input
voltage.
The corresponding inductor RMS current is:
I is the peak to peak ripple current which is fixed by
the inductor selection above. For a peak to peak cur-
rent of 30% of the full load current the peak current
at full load will be 115% of the full load. The 1.5μH
inductor selected from the Sumida CDRH6D38
series has a 11m
DCR and a 4.0 Amp DC current
rating with a height of 4 mm. At full load the inductor
DC loss is 99 mW for a 1 % loss in efficiency.
Schottky Freewheeling Diode
The Schottky average current is the load current
times one minus the duty cycle. For V
IN
at 5 Volts
and Vout at 3.3 Volts the average diode current is
With a 125°C maximum junction temperature and a
120°C/W thermal resistance the maximum average
current is
For overload, short circuit, and excessive ambient
conditions the AAT1154 enters the over-tempera-
ture shutdown mode protecting the AAT1154 as well
as the output Schottky. In this mode the output cur-
rent is limited internally until the junction tempera-
ture reaches the temperature limit (see over temp
characteristics graphs). The diode reverse voltage
must be rated to withstand the input voltage.
J(MAX)
T
θ
J-A
· V
FWD
AMB
T
125
120
70
·
= 1.14A
/
0.4
AVG
C
C
°
I
W
V
-
° -
°C
=
=
3.3
5.0
1
3
1
1
O
AVG
O
IN
V
V
V
V
I
I
A
A
=
-
=
-
·
·
=
2
2
3
12
RMS
O
O
I
I
I
I
A
=
+
=
≈
L =I
OUT
· k · F
SW
V
IN(MAX)
V
OUT
V
OUT
= 3.3V
3.0A · 0.3 · 1MHz
5.25V
3.3V
= 1.36
μ
H
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1154IAS-2.5-T1 | 制造商:SKYWORKS SOLUTIONS INC 功能描述:IC REG BUCK 2.5V 3A 8SOP TR 制造商:SKYWORKS SOLUTIONS 功能描述:AAT1154 Series 1 MHz 3 A 2.5V Surface Mount Step-Down DC/DC Converter - SOP-8 |
| AAT1154IAS-3.3-T1 | 制造商:SKYWORKS SOLUTIONS INC 功能描述:IC REG BUCK 3.3V 3A SOP-8 TR 制造商:SKYWORKS SOLUTIONS 功能描述:AAT1154 Series 1 MHz 3 A Surface Mount Step-Down DC/DC Converter - SOP-8 |
| AAT1155 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz 2.5A Step-Down DC/DC Converter |
| AAT1155_06 | 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-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 |
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