LM2674M-ADJ/NOPB Datasheet

DC/DC Switching Converters


The LM2674M-ADJ/NOPB 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 500 mA load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.OV, 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 LM2674M-ADJ/NOPB 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 LM2674M-ADJ/NOPB is 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. LM2674M-ADJ/NOPB Features • Efficiency up to 96%• Available in SOIC-8, 8-Pin PDIP and WSONPackages• Computer Design Software LM267X MadeSimple (Version 6.O)• Simple and Easy to Design With• Requires Only S External Components• Uses Readily Available Standard Inductors• 3.3V, S.OV, 12V, and Adjustable Output Versions• Adjustable Version Output Voltage Range:1.21V to 37V• 1.5% Max Output Voltage Tolerance Over Line and Load Conditions• Guaranteed 500mA Output Load Current• 0.250 DMOS Output Switch• Wide Input Voltage Range: 8V to 40V• 260 kHz Fixed Frequency Internal Oscillator• TTL Shutdown Capability, Low Power Standby Mode• Thermal Shutdown and Current Limit Protection LM2674M-ADJ/NOPB Applications • Simple High Efficiency (>90%) Step-Down(Buck) Regulator• Efficient Pre-Regulator for Linear Regulators• Positive-to-Negative Converter


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