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LM3489 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM3489 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
1 / 15 page LM3489 Hysteretic PFET Buck Controller with Enable Pin General Description The LM3489 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultra-low dropout, 100% duty cycle operation. An- other benefit is high efficiency operation at light loads without an increase in output ripple. A dedicated Enable Pin provides a shutdown mode drawing only 7µA. Leaving the Enable Pin unconnected defaults to on. Current limit protection can be implemented by measuring the voltage across the PFET’s R DS(ON), thus eliminating the need for a sense resistor. A sense resistor may be used to improve current limit accuracy if desired. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents. Features n Easy to use control methodology n No control loop compensation required n Wide 4.5V to 35V input range n 1.239V to V IN adjustable output range n High efficiency 93% n ± 1.3% (±2% over temp) internal reference n 100% duty cycle operation n Maximum operation frequency > 1MHz n Current limit protection n Dedicated enable pin (on if unconnected) n Shutdown mode draws only 7µA supply current n MSOP-8 Applications n Set-Top Box n DSL/Cable Modem n PC/IA n Auto PC n TFT Monitor n Battery Powered Portable Applications n Distributed Power Systems n Always On Power n High Power LED Driver Typical Application Circuit 20186908 May 2006 © 2006 National Semiconductor Corporation DS201869 www.national.com |
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