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AAT2552 参数 Datasheet PDF下载

AAT2552图片预览
型号: AAT2552
PDF下载: 下载PDF文件 查看货源
内容描述: 用于便携式应用的总电源解决方案 [Total Power Solution for Portable Applications]
分类和应用: 便携式
文件页数/大小: 33 页 / 1050 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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AAT2552  
Total Power Solution for Portable Applications  
Step-Down Converter Design Example (to be updated)  
Specifications  
VO  
VIN  
FS  
= 1.8V @ 250mA, Pulsed Load ΔILOAD = 200mA  
= 2.7V to 4.2V (3.6V nominal)  
= 1.5MHz  
TAMB = 85°C  
1.8V Output Inductor  
µsec  
µsec  
1.8V = 3µH  
A
L1 = 1.67  
VO2 = 1.67  
(use 3.0µH; see Table 3)  
A
For Sumida inductor CDRH2D09-3R0, 3.0µH, DCR = 150mΩ.  
VO  
L1 FS  
VO  
VIN  
1.8  
V
1.8V  
4.2V  
ΔIL1 =  
1 -  
=
1 -  
= 228mA  
3.0µH 1.5MHz  
ΔIL1  
2
IPKL1 = IO +  
= 250mA + 114mA = 364mA  
2
PL1 = IO DCR = 250mA2 150mΩ = 9.375mW  
1.8V Output Capacitor  
VDROOP = 0.1V  
3 · ΔILOAD  
VDROOP · FS  
3 · 0.2A  
COUT  
=
=
= 4µF (use 4.7µF)  
0.1V · 1.5MHz  
(VO) · (VIN(MAX) - VO)  
L1 · FS · VIN(MAX)  
1
1.8V · (4.2V - 1.8V)  
1
·
= 66mArms  
IRMS  
=
·
=
3.0µH · 1.5MHz · 4.2V  
2· 3  
2· 3  
Pesr = esr · IRMS2 = 5mΩ · (66mA)2 = 21.8µW  
28  
2552.2007.04.1.0  
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