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AAT1157IVN-T1 PDF预览

AAT1157IVN-T1

更新时间： 2024-02-05 16:01:02
品牌 Logo 应用领域
ANALOGICTECH 转换器
页数 文件大小 规格书
14页 395K
描述
1MHz 1.2A Buck DC/DC Converter

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中文翻译

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AAT1157IVN-T1 技术参数

生命周期：Obsolete包装说明：,
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.77
模拟集成电路 - 其他类型：SWITCHING REGULATORBase Number Matches：1

AAT1157IVN-T1 数据手册

 浏览型号AAT1157IVN-T1的Datasheet PDF文件第5页浏览型号AAT1157IVN-T1的Datasheet PDF文件第6页浏览型号AAT1157IVN-T1的Datasheet PDF文件第7页浏览型号AAT1157IVN-T1的Datasheet PDF文件第9页浏览型号AAT1157IVN-T1的Datasheet PDF文件第10页浏览型号AAT1157IVN-T1的Datasheet PDF文件第11页 
AAT1157  
1MHz 1.2A Buck DC/DC Converter  
LX  
Enable  
U1  
AAT1157  
VOUT+  
VIN+  
12  
11  
10  
4
VP  
FB  
VOUT(V)  
R3 (kΩ)  
R3  
15  
14  
13  
16  
3
R1  
100  
0.8  
0.9  
1.0  
1.1  
1.2  
1.3  
1.4  
1.5  
1.8  
2.0  
2.5  
3.3  
19.6  
29.4  
39.2  
49.9  
59.0  
68.1  
78.7  
88.7  
118  
VP  
LX  
LX  
L1  
VP  
3.0µH  
R2  
7
EN  
LX  
100K  
9
6
8
5
C1  
10µF  
VCC  
N/C  
N/C  
N/C  
R4  
59.0k  
C2  
0.1µF  
PGND  
PGND  
137  
C3-C4  
2x 22µF  
2
187  
267  
1
SGND PGND  
GND  
GND  
C1 Murata 10µF 6.3V X5R GRM42-6X5R106K6.3  
C3,C4 MuRata 22µF 6.3V GRM21BR60J226ME39L X5R 0805  
L1 Sumida CDRH5D28-3R0NC  
Figure 1: AAT1157 Evaluation Board Schematic  
Lithium-Ion to 2.5V Converter.  
Inductor  
Input Capacitor  
The output inductor should limit the ripple current to  
330mA at the maximum input voltage. This match-  
es the inductor current downslope with the fixed  
internal slope compensation. For a 2.5V output and  
the ripple set to a maximum input voltage of 4.2V,  
the inductance value required to limit the ripple cur-  
rent to 330mA is 3.0µH. From this calculated value,  
a standard value can be selected.  
The primary function of the input capacitor is to pro-  
vide a low impedance loop for the edges of pulsed  
current drawn by the AAT1157. 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 keeps  
the high frequency content of the input current  
localized, minimizing radiated and conducted EMI  
while facilitating optimum performance of the  
AAT1157. Ceramic X5R or X7R capacitors are  
ideal for this function. The size required will vary  
depending on the load, output voltage, and input  
voltage source impedance characteristics. Values  
range from 1µF to 10µF. The input capacitor RMS  
current varies with the input voltage and the output  
voltage. The equation for the RMS current in the  
input capacitor is:  
Manufacturer's specifications list both the inductor  
DC current rating, which is a thermal limitation, and  
the peak current rating, which is determined by the  
saturation characteristics. The inductor should not  
show any appreciable saturation under normal load  
conditions. Some inductors may meet the peak and  
average current ratings yet result in excessive loss-  
es due to a high DCR. Always consider the losses  
associated with the DCR and its effect on the total  
converter efficiency when selecting an inductor.  
VO  
VIN  
⎛
VO ⎞  
VIN ⎠  
I
RMS = IO ⋅  
⋅ 1 -  
⎝
VOUT  
∆IPP ⋅ F  
⎛
VOUT  
⎞
L =  
=
⋅ 1 -  
⎝
⎠
VIN(MAX)  
The input capacitor RMS ripple current reaches a  
maximum when VIN is two times the output volt-  
age where it is approximately one half of the load  
current. Losses associated with the input ceramic  
capacitor are typically minimal and are not an  
issue. The proper placement of the input capaci-  
tor can be seen in the evaluation board layout (C1  
in Figure 2).  
2.5  
V
2.5V  
4.2V  
⎛
⎞
⎠
⋅ 1 -  
0.33A ⋅ 1MHz  
⎝
= 3.07µH  
For a maximum ripple current of 330mA, the peak  
switch and inductor current at 1.2A is 1.365A. A stan-  
dard value of 3.0µH can be used in this example. The  
3.0µH Sumida series CDRH5D28 inductor has a  
24mΩ maximum DCR and a 2.4A DC current rating.  
8
1157.2005.11.1.4  
1...567891011...14

中文翻译

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