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AS1334-BTDT-25 参数 Datasheet PDF下载

AS1334-BTDT-25图片预览
型号: AS1334-BTDT-25
PDF下载: 下载PDF文件 查看货源
内容描述: 650毫安,超低纹波降压DC / DC转换器 [650mA, Ultra low Ripple Step Down DC/DC Converter]
分类和应用: 转换器
文件页数/大小: 17 页 / 1733 K
品牌: AMSCO [ AMS(艾迈斯) ]
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AS1334  
Datasheet - Detailed Description  
8 Detailed Description  
The AS1334 is a simple, step-down DC-DC converter optimized for powering portable applications that require low  
dropout voltages such as mobile phones, portable communicators, and similar battery powered RFID devices. Besides  
being packed with numerous features like current overload protection, thermal overload shutdown and soft start,  
AS1334 displays the following characteristics:  
Its operation is based on current-mode buck architecture with synchronous rectification for high efficiency.  
Allows the application to operate at maximum efficiency over a wide range of power levels from a single Li-Ion bat-  
tery cell.  
Provides for a maximum load capability of 650mA in PWM mode, wherein the maximum load range may vary  
depending on input voltage, output voltage and the selected inductor.  
Is ranked at an efficiency of around 96% for a 400mA load with a 3.6V input voltage.  
Figure 22. AS1334 - Functional Block Diagram  
PVIN  
POK  
VDD  
1.13V  
+
Oscillator  
Current  
Sense  
FB  
Mosfet  
Control  
Logic  
SW  
Soft Start  
Main Control  
EN  
Shutdown  
Control  
AS1334  
SGND  
PGND  
The size of the external components is reduced by using a high switching frequency (2MHz). Figure 1 on page 1  
demonstrates that only three external power components are required for implementation. Also, the system controller  
should set EN low during power-up and other low supply voltage conditions. See Shutdown Mode on page 12.  
www.austriamicrosystems.com  
Revision 1.04  
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