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LM3489 Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM3489 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 25 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 LM3489-Q1 www.ti.com SNVS443B – MAY 2006 – REVISED FEBRUARY 2013 Hysteretic PFET Buck Controller With Enable Pin Check for Samples: LM3489, LM3489-Q1 1 FEATURES DESCRIPTION The LM3489 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, cost effective, switching buck • Wide 4.5V to 35V input range regulator for a wide range of applications. The hysteretic control architecture provides for simple • 1.239V 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 operation. Another benefit is high efficiency operation • Maximum operation frequency > 1MHz at light loads without an increase in output ripple. A • Current limit protection dedicated Enable Pin provides a shutdown mode drawing only 7µA. Leaving the Enable Pin • Dedicated enable pin (on if unconnected) unconnected defaults to on. • Shutdown mode draws only 7µA supply current Current limit protection can be implemented by measuring the voltage across the PFET’s RDS(ON), • VSSOP-8 thus eliminating the need for a sense resistor. A • LM3489 is AEC-Q100 Grade 1 qualified sense resistor may be used to improve current limit accuracy if desired. The cycle-by-cycle current limit APPLICATIONS can be adjusted with a single resistor, ensuring safe operation over a range of output currents. • Set-Top Box • DSL or Cable Modem • PC/IA • Auto PC • TFT Monitor • Battery Powered Portable Applications • Distributed Power Systems • Always On Power • High Power LED Driver • Automotive 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 © 2006–2013, 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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