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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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LM3485MM Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM3485MM Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 15 page  LM3485 Hysteretic PFET Buck Controller General Description The LM3485 is a high efficiency PFET switching regulator controller that a system designer can use to quickly and easily develop a small, low cost, switching buck regulator for a wide range of applications. The use of a hysteretic control scheme provides for simple design without any control loop stability concerns using a wide variety of external compo- nents. The PFET architecture also allows for low component count as well as ultra-low dropout operation. Another benefit is high efficiency operation at light loads without an increase in output ripple. Current limit protection circuit is provided by measuring the voltage across the PFET’s R DSON thus elimi- nating a costly sense resistor. The current limit can be ad- justed allowing for designs at various output currents and costs. Features n Easy to use control methodology n No control loop compensation required n 4.5V to 35V wide input range n 1.242V to V IN adjustable output range n High Efficiency 93% n ± 1.3% (±2% over temp) internal reference n 100% duty cycle n Maximum operating frequency > 1MHz n Current limit protection 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 Typical Application Circuit 20034608 May 2002 © 2002 National Semiconductor Corporation DS200346 www.national.com |
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