Texas Instruments LM2674N-3.3/NOPB

SIMPLE SWITCHER® 40V, 500mA Low Component Count Step-Down Regulator 8-PDIP -40 to 125

Switching Regulator, Voltage-mode, 1.25A, 260kHz Switching Freq-Max, DMOS, PDIP8

IC REG BUCK 3.3V 0.5A 8-DIP / Conv DC-DC 8V to 40V Step Down Single-Out 3.3V 0.5A 8-Pin PDIP Tube

1.25 A SWITCHING REGULATOR 275 kHz SWITCHING FREQ-MAX PDIP8

Buck No 260KHz Fixed 1 3.3V 3.3V 40V 6.5V PDIP-8 5.08mm

Voltage Regulator IC; Voltage Regulator Type:Switching; Input Voltage Primary Max:40V; Output Voltage Max:3.3V; Output Current Max:0.5A; Voltage Tolerance ±:0.015%; Supply Voltage Min:6.5V; Supply Voltage Max:40V ;RoHS Compliant: Yes

The LM2674 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 500 mA 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 LM2674 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 LM2674 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 data sheet 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 uA stand-by current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions. To simplify the LM2674 buck regulator design procedure, there exists computer design software, LM267X Made Simple (version 6.0).