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LM3485 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3485 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 22 page LM3485 www.ti.com SNVS178F – MAY 2004 – REVISED SEPTEMBER 2009 LM3485 Hysteretic PFET Buck Controller Check for Samples: LM3485 1 FEATURES APPLICATIONS 2 • Easy to use control methodology • Set-Top Box • No control loop compensation required • DSL/Cable Modem • 4.5V to 35V wide input range • PC/IA • 1.242V to VIN adjustable output range • Auto PC • High Efficiency 93% • TFT Monitor • ±1.3% (±2% over temp) internal reference • Battery Powered Portable Applications • 100% duty cycle • Distributed Power Systems • Maximum operating frequency > 1MHz • Always On Power • Current limit protection • MSOP-8 DESCRIPTION The LM3485 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, low cost, 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. Another benefit is high efficiency operation at light loads without an increase in output ripple. Current limit protection is provided by measuring the voltage across the PFET’s RDS(ON), thus eliminating the need for a sense resistor. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents. Typical Application Circuit Connection Diagram Figure 1. 8 Lead Plastic MSOP-8 Top View 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 © 2004–2009, 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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