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LM1771SMM データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM1771SMM データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page LM1771 Low-Voltage Synchronous Buck Controller with Precision Enable and No External Compensation General Description 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%. 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. Features n Input voltage range of 2.8V to 5.5V n 0.8V reference voltage 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 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 June 2006 © 2006 National Semiconductor Corporation DS201890 www.national.com |
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同様の説明 - LM1771SMM |
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