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LM3489 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3489 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 23 page  ISENSE ADJ VIN PGATE FB EN LM3489 GND PGND 1 2 3 4 5 6 7 8 + + Q1 VIN VOUT CIN1 COUT D1 L RADJ RIS CADJ R1 R2 Cff CIN2 LM3489 www.ti.com SNVS443A – MAY 2006 – REVISED JUNE 2008 LM3489/LM3489Q Hysteretic PFET Buck Controller with Enable Pin Check for Samples: LM3489 1 FEATURES • LM3489 is AEC-Q100 Grade 1 qualified 2 • Easy to use control methodology APPLICATIONS • No control loop compensation required • Set-Top Box • Wide 4.5V to 35V input range • DSL/Cable Modem • 1.239V to VIN adjustable output range • PC/IA • High efficiency 93% • Auto PC • ±1.3% (±2% over temp) internal reference • TFT Monitor • 100% duty cycle operation • Battery Powered Portable Applications • Maximum operation frequency > 1MHz • Distributed Power Systems • Current limit protection • Always On Power • Dedicated enable pin (on if unconnected) • High Power LED Driver • Shutdown mode draws only 7µA supply • Automotive current • MSOP-8 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. Another 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 RDS(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. 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 © 2006–2008, 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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