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LM2675MX-12

SIMPLE SWITCHER buck, 8-40V in, 12V/1A out, 96% eff, SOIC-8

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Manufacturer Part：

LM2675MX-12

Package：

SOIC-8 (4.9×3.9×1.5 mm, 1.27mm pitch)

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Description

Product Overview

The LM2675MX-12 from Texas Instruments is a SIMPLE SWITCHER® step-down voltage regulator providing a fixed 12V output at up to 1A from an 8V to 40V input. Built with LMDMOS process, it achieves up to 96% efficiency with only 5 external components. The 260 kHz fixed-frequency oscillator enables small filter components, while internal frequency compensation, thermal shutdown, and current limit provide a robust and easy-to-use buck converter solution in an SOIC-8 package.

Key Specifications

Topology Step-Down (Buck)
Output Voltage 12V (fixed)
Input Voltage Range 8V to 40V
Output Current 1A (maximum)
Efficiency Up to 96% (typical 94% at 12V out)
Switching Frequency 260 kHz (fixed)
Output Voltage Tolerance ±1.5% over line and load
Quiescent Current 2.5 mA (typical)
Standby Current 50 µA (shutdown mode)
Duty Cycle (max) 95%
Control Mode Voltage mode with internal compensation
Operating Temperature -40°C to +125°C
Package SOIC-8 (4.9×3.9 mm)

Features

  • SIMPLE SWITCHER: only 5 external components needed
  • Fixed 12V output with ±1.5% tolerance
  • Up to 96% efficiency — PCB traces provide sufficient heatsinking
  • 260 kHz fixed frequency for small filter components
  • Internal frequency compensation — no external compensation network
  • TTL-compatible shutdown/enable pin (50 µA standby)
  • Thermal shutdown and current limit protection
  • Also available in 3.3V, 5V, and adjustable output versions

Applications

  • 12V power supply from 24V industrial bus
  • Automotive battery to 12V system power
  • Telecom distributed power architecture
  • Industrial control and automation power
  • Battery-powered high-voltage to 12V conversion

The LM2675MX-12 from Texas Instruments is a SIMPLE SWITCHER step-down regulator providing fixed 12V output at up to 1A from 8V to 40V input. Achieving up to 96% efficiency with only 5 external components, its 260 kHz fixed frequency and internal compensation simplify design. With thermal shutdown, current limit, and TTL shutdown in an SOIC-8 package, it is ideal for industrial 24V to 12V conversion, automotive power, and telecom distributed power systems.

The LM2675MX-12 uses a voltage-mode buck converter topology with a fixed 260 kHz oscillator and patented internal frequency compensation. The LMDMOS power switch is integrated on-chip with the control circuitry. During each switching cycle, the high-side switch connects the input voltage to the inductor, ramping up the inductor current. When the switch turns off, the freewheeling diode conducts and the inductor current ramps down, delivering energy to the output capacitor and load. The error amplifier compares a fraction of the output voltage (via an internal resistor divider set to 12V) with an internal 1.21V reference, adjusting the PWM duty cycle to maintain regulation. The voltage-mode control with internal compensation ensures stability across the specified input/output range and inductor values. The ON/OFF pin provides TTL-compatible shutdown: pulling it low enables normal operation, while pulling it high or leaving it open puts the device in standby mode with only 50 µA supply current.

Pin Name Type Function
1 CB I/O Boot capacitor connection for high-side driver
2 VIN Power Input supply voltage (8-40V)
3 SW Output Switch output to inductor
4 GND Power Ground
5 FB Input Feedback (connect to output for fixed 12V version)
6 ON/OFF Input Shutdown control (LOW=on, HIGH/open=off)
7 NC — No connect
8 NC — No connect
  • 24V industrial bus to 12V system power conversion
  • Automotive 12V/24V battery to regulated 12V supply
  • Telecom -48V to 12V via intermediate bus converter
  • Industrial automation and PLC 12V power rails
  • High-voltage battery to 12V step-down conversion
Manufacturer Part Number Package Notes
TI LM2675MX-5.0 SOIC-8 5V fixed output version
TI LM2675MX-3.3 SOIC-8 3.3V fixed output version
TI LM2675MX-ADJ SOIC-8 Adjustable 1.21V-37V output
TI LM2679MX-12 TO-263-7 5A version, higher current
Monolithic Power MP8759GD SOIC-8 4A, 4.5-55V, newer alternative
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