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LM2675 Fiches technique(PDF) 1 Page - Texas Instruments |
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LM2675 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 30 page LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 LM2675 SIMPLE SWITCHER® Power Converter High Efficiency 1A Step-Down Voltage Regulator Check for Samples: LM2675 1 FEATURES • Guaranteed 1A output load current • 0.25 Ω DMOS Output Switch 234 • Efficiency up to 96% • Wide input voltage range: 8V to 40V • Available in SO-8, 8-pin DIP and LLP packages • 260 kHz fixed frequency internal oscillator • Computer Design Software LM267X Made Simple (version 6.0) • TTL shutdown capability, low power standby mode • Simple and easy to design with • Thermal shutdown and current limit protection • Requires only 5 external components • Uses readily available standard inductors TYPICAL APPLICATIONS • 3.3V, 5.0V, 12V, and adjustable output versions • Simple High Efficiency (>90%) Step-Down • Adjustable version output voltage range: 1.21V (Buck) Regulator to 37V • Efficient Pre-Regulator for Linear Regulators • ±1.5% max output voltage tolerance over line • Positive-to-Negative Converter and load conditions DESCRIPTION The LM2675 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation (Patent Nos. 5,382,918 and 5,514,947) and a fixed frequency oscillator. The LM2675 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency (>90%), the copper traces on the printed circuit board are the only heat sinking needed. A family of standard inductors for use with the LM2675 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the datasheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies. Other features include a guaranteed ±1.5% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 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 LM2675 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 is a registered trademark 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 © 2004–2005, 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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