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1771U PDF预览

1771U

更新时间: 2022-04-23 23:00:11
品牌 Logo 应用领域
美国国家半导体 - NSC 控制器
页数 文件大小 规格书
17页 769K
描述
Low-Voltage Synchronous Buck Controller with Precision Enable and No External Compensation

1771U 数据手册

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October 2006  
LM1771  
Low-Voltage Synchronous Buck Controller with  
Precision Enable and No External Compensation  
General Description  
Features  
n Input voltage range of 2.8V to 5.5V  
n 0.8V reference voltage  
The LM1771 is an efficient synchronous buck switching con-  
troller with a precision enable requiring no external compen-  
sation. The constant on-time control scheme provides a  
simple design free of compensation components, allowing  
minimal component count and board space. The precision  
enable pin allows flexibility in sequencing multiple rails and  
setting UVLO. The LM1771 also incorporates a unique input  
feed-forward to maintain a constant frequency independent  
of the input voltage. The LM1771 is optimized for a low  
voltage input range of 2.8V to 5.5V and can provide an  
adjustable output as low as 0.8V. Driving an external high  
side PFET and low side NFET it can provide efficiencies as  
high as 95%.  
n Precision enable  
n No compensation required  
n Constant frequency across input range  
n Low quiescent current of 400 µA  
n Internal soft-start  
n Short circuit protection  
n Tiny LLP-6 package and MSOP-8 package  
Applications  
n Simple To Design, High Efficiency Step Down Switching  
Three versions of the LM1771 are available depending on  
the switching frequency desired for the application. Nominal  
switching frequencies are in the range of 100kHz to  
1000kHz.  
Regulators  
n FPGAs, DSPs, and ASIC Power Supplies  
n Set-Top Boxes  
n Cable Modems  
n Printers  
n Digital Video Recorders  
n Servers  
n Graphic Cards  
Typical Application Circuit  
20189001  
© 2006 National Semiconductor Corporation  
DS201890  
www.national.com  

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