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參數(shù)資料
| 型號： | AAT1155IKS-3.3-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 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(zhuǎn)換器 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 401K |
| 代理商： | AAT1155IKS-3.3-T1 |
Schottky Freewheeling Diode
The Schottky average current is the load current
multiplied by one minus the duty cycle.
For V
IN
at 5V and V
OUT
at 3.3V, the average diode
current is:
With a 125°C maximum junction temperature and a
120°C/W thermal resistance, the maximum aver-
age current is:
For overload, short-circuit, and excessive ambient
temperature conditions, the AAT1155 enters over-
temperature shutdown mode protecting the
AAT1155 as well as the output Schottky. In this
mode, the output current is limited internally until
the junction temperature reaches the temperature
limit (see over-temperature characteristics graphs).
The diode reverse voltage must be rated to with-
stand the input voltage.
3A Surface Mount Schottky Diodes
Input Capacitor Selection
The primary function of the input capacitor is to pro-
vide a low impedance loop for the edges of pulsed
current drawn by the AAT1155. A low ESR/ESL
ceramic capacitor is ideal for this function. To mini-
mize stray inductance, the capacitor should be
placed as closely as possible to the IC. This also
keeps the high frequency content of the input cur-
rent localized, minimizing the radiated and con-
ducted EMI while facilitating optimum performance
of the AAT1155. Proper placement of the input
capacitor C1 is shown in the layout in Figure 2.
Ceramic X5R or X7R capacitors are ideal. The
size required will vary depending on the load, out-
put voltage, and input voltage source impedance
characteristics. Typical values range from 1μF to
10μF. The input capacitor RMS current varies with
the input voltage and the output voltage. It is high-
est when the input voltage is double the output volt-
age where it is one half of the load current.
1
O
O
O
RMS
I
IN
IN
V
V
V
V
I
=
·
·
-
Diodes Inc.
ROHM
Micro Semi
B340LA
RB050L-40
5820SM
0.45V @ 3A
0.45 @ 3A
0.46V @ 3A
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
5.0V
1
2.5
1
0.85A
O
IN
V
V
V
I
AVG
= I
O
·
A
-
=
-
·
=
1
O
IN
V
V
-
AAT1155
1MHz 2.5A Step-Down DC/DC Converter
1155.2005.11.1.6
11
Figure 2: 3.3V, 3A Output Efficiency.
D1
B340LA
L1
1.5μH
C2
120μF
C1
10μF
VP
VCC
EN
GND
FB
LX
LX
VP
AAU1
R1
100
C3
0.1μF
C3 0.1μF 0603ZD104M AVX
C4 Vishay Sprague 100μF 16V 595D107X0016C 100μF 16V
L1 CDRH6D28-1.5μH Sumida
D1 B340LA Diodes Inc.
R2
100k
C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3
C2 Vishay120μF 6.3V 594D127X96R6R3C2T
C2 MuRata 100μF 6.3V GRM43-2 X5R 107M 100μF 6.3V (two or three in parallel)
C2 TDK 100μF 6.3V C3325X5R0J107M 100μF 6.3V (two or three in parallel)
Vin 3.5V-5.5V
Vout 3.3V @ 2.5A
rtn
C4
100μF
Options
+
-
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