LM2675MX-5.0 SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator

Features

► Efficiency up to 96%

► Available in SO-8, 8-pin DIP and LLP packages

► Computer Design Software LM267X Made Simple (version 6.0)

►Simple and easy to design with

► Requires only 5 external components

► Uses readily available standard inductors

► 3.3V, 5.0V, 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 1A output load current

► 0.25Ω 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

General 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.

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