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LM2675MX-5.0/NOPB

1A SIMPLE SWITCHER buck regulator, 5.0V fixed, 8-40V input, 260kHz, 96% eff, SOIC-8

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Manufacturer Part：

LM2675MX-5.0/NOPB

Package：

8-SOIC (4.9 x 6.0 x 1.75mm)

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Description

Product Overview

The LM2675MX-5.0/NOPB from Texas Instruments is a SIMPLE SWITCHER 6.5V-to-40V, 1A step-down buck voltage regulator with fixed 5.0V output. It features 260kHz switching frequency, up to 96% efficiency, only 5 external components required, and TTL shutdown capability in an 8-pin SOIC package.

Key Specifications

Manufacturer Texas Instruments
Topology Buck (Step-Down)
Output Voltage 5.0V (fixed)
Output Current 1A
Input Voltage Range 8V to 40V
Switching Frequency 260kHz
Efficiency Up to 96%
Quiescent Current 2.5mA typical
Standby Current 50uA typical
Output Voltage Tolerance +-1.5% max
Package 8-SOIC (4.9 x 6.0mm)
Operating Temperature -40C to +125C

Features

  • Efficiency up to 96%
  • Only 5 external components required
  • Fixed 5.0V output with +-1.5% tolerance
  • 260kHz fixed frequency internal oscillator
  • 0.25Ohm DMOS output switch
  • TTL shutdown capability, low-power standby mode
  • Thermal shutdown and current limit protection
  • Uses readily available standard inductors

Applications

  • Simple high-efficiency step-down regulators
  • Efficient pre-regulator for linear regulators
  • Positive-to-negative converters
  • Battery-powered equipment
  • Embedded system power supplies

The Texas Instruments LM2675MX-5.0/NOPB is a SIMPLE SWITCHER step-down voltage regulator built with LMDMOS process technology. It provides all active functions for a 1A buck switching regulator with fixed 5.0V output. The device requires only five external components and features patented internal frequency compensation and a fixed 260kHz oscillator. The high efficiency exceeding 90% means PCB copper traces provide sufficient heat sinking. Standard inductors from multiple manufacturers are compatible, greatly simplifying design. The device includes +-1.5% output voltage tolerance, external shutdown with 50uA standby current, and current limiting with thermal shutdown protection.

The LM2675MX-5.0/NOPB operates as a fixed-frequency buck converter with three key subsystems: 1) Oscillator and Control: The 260kHz internal oscillator sets the switching frequency. Voltage-mode control with patented internal compensation maintains output regulation. The duty cycle adjusts to maintain 5.0V output across input voltage and load variations. 2) Power Stage: The internal 0.25Ohm DMOS output switch alternately connects and disconnects the input voltage to the output inductor. When on, energy is stored in the inductor; when off, the catch diode provides a current path, transferring stored energy to the output capacitor and load. 3) Protection: Cycle-by-cycle current limiting prevents switch damage. Thermal shutdown disables the output when junction temperature exceeds the safe limit. The ON/OFF pin allows TTL-level shutdown with 50uA standby current.

Pin Name Type Function
1 ON/OFF Input Shutdown control (TTL level, active low)
2 VIN Power Input supply voltage (8V to 40V)
3 GND Ground Ground connection
4 FB Input Feedback (connect to output for 5V fixed)
5 GND Ground Ground connection
6 GND Ground Ground connection
7 GND Ground Ground connection
8 VSW Output Switch output (connect to inductor)
  • 5V power supply from 12V or 24V industrial bus
  • Efficient pre-regulator before low-noise linear regulators
  • Battery-powered equipment requiring 5V from 9V-24V sources
  • Embedded system point-of-load regulation
Manufacturer Part Number Package Notes
TI LM2675MX-3.3/NOPB SOIC-8 3.3V version, same series
TI LM2675MX-12/NOPB SOIC-8 12V version, same series
TI LM2675MX-ADJ/NOPB SOIC-8 Adjustable version
TI LMR16030PDDAR HSOIC-8 60V, 3A, newer alternative
Monolithic Power MP1484DS SOIC-8 4.5-18V, 2A buck
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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