Part # LM2674 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2674 SIMPLE SWITCHER® Power Converter High Efficiency 500 mA Step-Down Voltage Regulator

Part Details:

Regulator LM2674 February 2005 SIMPLE LM2674SIMPLE SWITCHER® Power Converter High Efficiency500 mA Step-Down Voltage Regulator SWITCHER General Description To simplify the LM2674 buck regulator design procedure,there exists computer design software, LM267X Made The LM2674 series of regulators are monolithic integrated Simple (version 6.0). circuits built with a LMDMOS process. These regulatorsprovide all the active functions for a step-down (buck) Features switching regulator, capable of driving a 500 mA load currentwith excellent line and load regulation. These devices are n Efficiency up to 96% available in fixed output voltages of 3.3V, 5.0V, 12V, and an n Available in SO-8, 8-pin DIP and LLP packages Power adjustable output version. n Computer Design Software LM267X Made Simple Requiring a minimum number of external components, these (version 6.0) regulators are simple to use and include patented internal n Simple and easy to design with frequency compensation (Patent Nos. 5,382,918 and n Requires only 5 external components 5,514,947) and a fixed frequency oscillator. n Uses readily available standard inductors Converter The LM2674 series operates at a switching frequency of n 3.3V, 5.0V, 12V, and adjustable output versions 260 kHz, thus allowing smaller sized filter components than n Adjustable version output voltage range: 1.21V to 37V what would be needed with lower frequency switching regu- n ±1.5% max output voltage tolerance over line and load lators. Because of its very high efficiency (>90%), the cop- conditions per traces on the printed circuit board are the only heat n Guaranteed 500mA output load current sinking needed. n 0.25 DMOS Output Switch A family of standard inductors for use with the LM2674 are High n Wide input voltage range: 8V to 40V available from several different manufacturers. This feature n 260 kHz fixed frequency internal oscillator greatly simplifies the design of switch-mode power suppliesusing these advanced ICs. Also included in the datasheet n TTL shutdown capability, low power standby mode are selector guides for diodes and capacitors designed to n Thermal shutdown and current limit protection Efficiency work in switch-mode power supplies. Other features include a guaranteed ±1.5% tolerance on Typical Applications output voltage within specified input voltages and output n Simple High Efficiency (>90%) Step-Down (Buck)

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LM2674.pdf Datasheet