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LM3485Q1MMX Fiches technique(PDF) 1 Page - Texas Instruments |
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LM3485Q1MMX Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 23 page LM3485 www.ti.com SNVS178G – JANUARY 2002 – REVISED FEBRUARY 2013 Hysteretic PFET Buck Controller Check for Samples: LM3485 1 FEATURES DESCRIPTION The LM3485 is a high efficiency PFET switching 2 • Easy to Use Control Methodology regulator controller that can be used to quickly and • No Control Loop Compensation Required easily develop a small, low cost, switching buck • 4.5V to 35V Wide Input Range regulator for a wide range of applications. The hysteretic control architecture provides for simple • 1.242V to VIN Adjustable Output Range design without any control loop stability concerns • High Efficiency 93% using a wide variety of external components. The • ±1.3% (±2% Over Temp) Internal Reference PFET architecture also allows for low component count as well as ultra-low dropout, 100% duty cycle • 100% Duty Cycle operation. Another benefit is high efficiency operation • Maximum Operating Frequency > 1MHz at light loads without an increase in output ripple. • Current Limit Protection Current limit protection is provided by measuring the • VSSOP-8 voltage across the PFET’s RDS(ON), thus eliminating the need for a sense resistor. The cycle-by-cycle APPLICATIONS current limit can be adjusted with a single resistor, ensuring safe operation over a range of output • Set-Top Box currents. • DSL or Cable Modem • PC/IA • Auto PC • TFT Monitor • Battery Powered Portable Applications • Distributed Power Systems • Always On Power Typical Application Circuit 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2002–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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