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AAT1149A 参数 Datasheet PDF下载

AAT1149A图片预览
型号: AAT1149A
PDF下载: 下载PDF文件 查看货源
内容描述: 2.2MHz的快速瞬态400毫安降压转换器 [2.2MHz Fast Transient 400mA Step-Down Converter]
分类和应用: 转换器
文件页数/大小: 17 页 / 1859 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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PRODUCT DATASHEET  
AAT1149A  
TM  
SwitchReg  
2.2MHz FastTransient 400mA Step-Down Converter  
Figure 1: AAT1149AIUV Evaluation Board  
Top Side.  
Figure 2: AAT1149AIUV Evaluation Board  
Bottom Side.  
VIN  
U1  
L1  
5
4
IN  
LX  
VOUT  
C3  
EN  
AAT1149AIUV  
R1  
0
open  
1
3
2
2
EN  
FB  
C1  
4.7μF  
1
R2  
open  
C2  
4.7μF  
3
GND  
WLCSP-5  
Figure 3: AAT1149AIUV Evaluation Board Schematic.  
Thermal Calculations  
IO2 · (RDS(ON)H · VO + RDS(ON)L · [VIN - VO])  
PTOTAL  
=
There are three types of losses associated with the  
AAT1149A step-down converter: switching losses, con-  
duction losses, and quiescent current losses. Conduction  
losses are associated with the RDS(ON) characteristics of the  
power output switching devices. Switching losses are  
dominated by the gate charge of the power output switch-  
ing devices. At full load, assuming continuous conduction  
mode (CCM), a simplified form of the losses is given by:  
VIN  
+ (tsw · FS · IO + IQ) · VIN  
IQ is the step-down converter quiescent current. The  
term tsw is used to estimate the full load step-down con-  
verter switching losses.  
w w w . a n a l o g i c t e c h . c o m  
1149A.2008.08.1.1  
11