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LM2672 Datenblatt(PDF) 1 Page - Texas Instruments |
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LM2672 Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 33 page LM2672 www.ti.com SNVS136K – SEPTEMBER 1998 – REVISED APRIL 2013 LM2672 SIMPLE SWITCHER® Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features Check for Samples: LM2672 1 FEATURES DESCRIPTION The LM2672 series of regulators are monolithic 234 • Efficiency up to 96% integrated circuits built with a LMDMOS process. • Available in SOIC-8 and 8-pin PDIP Packages These regulators provide all the active functions for a • Computer Design Software LM267X Made step-down (buck) switching regulator, capable of Simple Version 6.0 driving a 1A load current with excellent line and load regulation. These devices are available in fixed output • Simple and Easy to Design with voltages of 3.3V, 5.0V, 12V, and an adjustable output • Requires only 5 External Components version. • Uses Readily Available Standard Inductors Requiring a minimum number of external • 3.3V, 5.0V, 12V, and Adjustable Output components, these regulators are simple to use and Versions include patented internal frequency compensation (Patent Nos. 5,382,918 and 5,514,947), fixed • Adjustable Version Output Voltage Range: frequency oscillator, external shutdown, soft-start, 1.21V to 37V and frequency synchronization. • ±1.5% Max Output Voltage Tolerance Over Line and Load Conditions The LM2672 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter • Specified 1A Output Load Current components than what would be needed with lower • 0.25 Ω DMOS Output Switch frequency switching regulators. Because of its very • Wide Input Voltage Range: 8V to 40V high efficiency (>90%), the copper traces on the printed circuit board are the only heat sinking needed. • 260 kHz Fixed Frequency Internal Oscillator • TTL Shutdown Capability, Low Power Standby A family of standard inductors for use with the LM2672 are available from several different Mode manufacturers. This feature greatly simplifies the • Soft-Start and Frequency Synchronization design of switch-mode power supplies using these • Thermal Shutdown and Current Limit advanced ICs. Also included in the datasheet are Protection selector guides for diodes and capacitors designed to work in switch-mode power supplies. TYPICAL APPLICATIONS Other features include a ensured ±1.5% tolerance on • Simple High Efficiency (>90%) Step-Down output voltage within specified input voltages and (Buck) Regulator output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring • Efficient Pre-Regulator for Linear Regulators typically 50 μA stand-by current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions. To simplify the LM2672 buck regulator design procedure, there exists computer design software, LM267X Made Simple version 6.0. 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 SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments. 3 Windows is a registered trademark of Microsoft Corporation. 4 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 1998–2013, 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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