LM2675

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SIMPLE SWITCHER® 6.5V to 40V, 1A Low Component Count Step-Down Regulator

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Data sheet

document-pdfAcrobat LM2675 SIMPLE SWITCHER® Power Converter, High-Efficiency, 1A, Step-Down Voltage Regulator datasheet (Rev. G) PDF | HTML

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LM2675

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Data sheet

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Product details

Rating

Catalog

Topology

Buck

Iout (max) (A)

Vin (max) (V)

Vin (min) (V)

6.5

Vout (max) (V)

Vout (min) (V)

1.23

Features

Enable, Overcurrent protection

Control mode

Voltage mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.0025

Duty cycle (max) (%)

Rating

Catalog

Topology

Buck

Iout (max) (A)

Vin (max) (V)

Vin (min) (V)

6.5

Vout (max) (V)

Vout (min) (V)

1.23

Features

Enable, Overcurrent protection

Control mode

Voltage mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.0025

Duty cycle (max) (%)

PDIP (P)

92.5083 mm² (9.81 mm × 9.43 mm)

WSON (NHN)

25 mm² (5 mm × 5 mm)

SOIC (D)

29.4 mm² (4.9 mm × 6 mm)

Efficiency up to 96%
Available in 8-pin SOIC, PDIP, and 16-pin WSON package
Requires only 5 external components
3.3V, 5V, 12V, and adjustable output versions
1.21V to 37V adjustable version output voltage range
±1.5% maximum output voltage tolerance over line and load conditions
Specified 1A output load current
8V to 40V wide input voltage range
260kHz fixed frequency internal oscillator
TTL shutdown capability, low-power standby mode
Thermal shutdown and current limit protection
Create a custom design using the LM2675 with the WEBENCH® Power Designer

Efficiency up to 96%
Available in 8-pin SOIC, PDIP, and 16-pin WSON package
Requires only 5 external components
3.3V, 5V, 12V, and adjustable output versions
1.21V to 37V adjustable version output voltage range
±1.5% maximum output voltage tolerance over line and load conditions
Specified 1A output load current
8V to 40V wide input voltage range
260kHz fixed frequency internal oscillator
TTL shutdown capability, low-power standby mode
Thermal shutdown and current limit protection
Create a custom design using the LM2675 with the WEBENCH® Power Designer

The LM2675 series of regulators are monolithic integrated DC-DC converter 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, 5V, 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 and a fixed frequency oscillator.

The LM2675 series operates at a switching frequency of 260kHz, thus allowing smaller-sized filter components than what is needed with lower frequency switching regulators. Because of the 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 data sheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.

Other features include ±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 50µA stand-by current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation and a fixed frequency oscillator.

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Technical documentation

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Top documentation	Type	Title	Format options	Date
*	Data sheet	LM2675 SIMPLE SWITCHER® Power Converter, High-Efficiency, 1A, Step-Down Voltage Regulator datasheet (Rev. G)	PDF \| HTML	Jun 25, 2025
	Application note	Semiconductor and IC Package Thermal Metrics (Rev. D)	PDF \| HTML	Mar 25, 2024
	Technical article	How to increase system reliability and simplify design using DC/DC converters	PDF \| HTML	Jun 13, 2016
	Technical article	The importance of accurate switching frequency and current limit when selecting bu	PDF \| HTML	Apr 19, 2016
	Technical article	Advantages of leaded packages in robust industrial designs	PDF \| HTML	Mar 8, 2016
	Application note	Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A)		Sep 12, 2014
	Application note	AN-1187 Leadless Leadframe Package (LLP) (Rev. R)		May 7, 2013
	EVM User's guide	LM2675 5.0EVAL 1A Step-Down High-Efficiency SIMPLE SWITCHER Eval Brd (Rev. C)		Apr 24, 2013
	Application note	AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C)		Apr 24, 2013
	Application note	AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A)		Apr 23, 2013
	Application note	AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)		Apr 23, 2013
	Application note	AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C)		Apr 23, 2013
	Application note	AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C)		Apr 23, 2013
	Application note	AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)		Apr 23, 2013
	Application note	AN-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E)		Apr 23, 2013
	Application note	AN-1197 Selecting Inductors for Buck Converters (Rev. B)		Apr 23, 2013
	Application note	AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C)		Apr 23, 2013
	Application note	AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B)		Apr 23, 2013
	Application note	Simple Techniques Minimize Cross-Coupling in Distributed Power Systems		Mar 21, 2007
	Application note	Input and Output Capacitor Selection		Sep 19, 2005
	More literature	SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations		Jul 12, 2005
	Application note	AN-643 EMI/RFI Board Design (Rev. B)		May 3, 2004

Design & development

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Evaluation board

LM2675-5.0EVAL — SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator Evaluation Module

Amp Step-Down High-Efficency SIMPLE SWITCHER Evaluation Board.

The LM2675 SIMPLE SWITCHER step-down regulator provides all the active functions for a step-down regulator capable of driving a 1A load. Switching frequency is internally set to 260 kHz, allowing smaller-sized filter components than (...)

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