Product Overview

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

LM2675M-5.0 CAD Models

Figure: LM2675M-5.0 PCB Symbol

Figure: LM2675M-5.0 Footprint

Figure: LM2675M-5.0 3D Models

LM2675M-5.0 Pin Configuration

Figure: LM2675M-5.0 Pin Configuration

LM2675M-5.0 Block Diagram

Figure: LM2675M-5.0 Block Diagram

LM2675M-5.0 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

• 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 loadconditions

• Guaranteed 1A output load current

• 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

LM2675M-5.0 Applications

• Simple High Efficiency (>90%) Step-Down (Buck)Regulator

• Efficient Pre-Regulator for Linear Regulators

• Positive-to-Negative Converter

LM2675M-5.0 Datasheet

You can download the datasheet from the link given below:

LM2675M-5.0 Datasheet

LM2675M-5.0 Specifications

LM2675M-5.0 Manufacturer

National Semiconductor was an American semiconductor manufacturer which specialized in analog devices and subsystems, formerly with headquarters in Santa Clara, California. The company produced power management integrated circuits, display drivers, audio and operational amplifiers, communication interface products and data conversion solutions. National's key markets included wireless handsets, displays and a variety of broad electronics markets, including medical, automotive, industrial and test and measurement applications. On September 23, 2011, the company formally became part of Texas Instruments as the "Silicon Valley" division.

Using Warning

Note: Please check their parameters and pin configuration before replacing them in your circuit.

LM2675M-5.0 FAQ

What is a step down voltage regulator?

A "buck" or "step-down" switch-mode voltage regulator is one in which the output voltage is lower than its input voltage.

Which is the most efficient voltage regulator?

When high efficiency is needed, or a wide range of input voltage is expected, a switching regulator becomes the best option. Switching voltage regulators have power efficiencies of 85% or better compared to linear voltage regulator efficiencies that are often below 50%.

What is switcher regulator?

A switching regulator is a circuit that uses a power switch, an inductor, and a diode to transfer energy from input to output. The power switch, usually a Field Effect Transistor (FET), is turned on and off by a switching controller IC that monitors the output of the switching regulator in a feedback control loop.

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