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LM3485Q1MMX Datasheet(PDF) 1 Page - Texas Instruments |
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LM3485Q1MMX Datasheet(HTML) 1 Page - Texas Instruments |
1 / 28 page Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3485 SNVS178H – JANUARY 2002 – REVISED DECEMBER 2015 LM3485 Hysteretic PFET Buck Controller 1 Features 3 Description The LM3485 is a high-efficiency PFET switching 1 • 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 • 4.5-V to 35-V Wide Input Range regulator for a wide range of applications. The hysteretic control architecture provides for simple • 1.242-V 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 ultralow dropout, 100% duty cycle • 100% Duty Cycle operation. Another benefit is high efficiency operation • Maximum Operating Frequency > 1 MHz at light loads without an increase in output ripple. • Current Limit Protection Current limit protection is provided by measuring the voltage across the RDS(ON) of the PFET, thus 2 Applications eliminating the need for a sense resistor. The cycle- • Set-Top Box by-cycle current limit can be adjusted with a single • DSL or Cable Modem resistor, ensuring safe operation over a range of output currents. • PC/IA • Auto PC Device Information(1) • TFT Monitor PART NUMBER PACKAGE BODY SIZE (NOM) • Battery-Powered Portable Applications LM3485 VSSOP (8) 3.0 mm × 3.0 mm • Distributed Power Systems (1) For all available packages, see the orderable addendum at the end of the data sheet. • Always On Power Typical Application Circuit 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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