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A7801E6R 参数 Datasheet PDF下载

A7801E6R图片预览
型号: A7801E6R
PDF下载: 下载PDF文件 查看货源
内容描述: [DC-DC CONVERTER LOW NOISE, REGULATED CHARGE PUMP]
分类和应用: DC-DC转换器
文件页数/大小: 10 页 / 266 K
品牌: AITSEMI [ AiT Semiconductor ]
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A7801  
AiT Semiconductor Inc.  
DC-DC CONVERTER  
www.ait-ic.com  
LOW NOISE, REGULATED CHARGE PUMP  
light load applications the above expression can be used as a guideline in determining a starting capacitor  
value.  
Power Efficiency  
The power efficiency of the A7801 is similar to that of a linear regulator with an effective output voltage of  
twice the actual input voltage. This occurs because the input current for a voltage doubling charge pump is  
approximately twice the output current. In an ideal regulating voltage doubler the power efficiency would be  
given by:  
At moderate to high output power the switching losses and quiescent current of the A7801 are negligible and  
the expression above is valid. For example with VIN = 3V, IOUT = 50mA and VOUT =5V the measured efficiency  
is 80% which is in close agreement with the theoretical 83.3% calculation.  
Layout Considerations  
Due to its high switching frequency and the high transient currents produced by the A7801, careful board  
layout is necessary. A true ground plane and short connections to all capacitors will improve performance and  
ensure proper regulation under all conditions.  
REV1.0  
- JAN 2015 RELEASED -  
- 8 -