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Buck converters (integrated switch)

LM2675

ACTIVE

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

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Data sheet

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LM2675

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 6.5 Vin (max) (V) 40 Vout (min) (V) 1.23 Vout (max) (V) 37 Iout (max) (A) 1 Iq (typ) (mA) 2.5 Switching frequency (min) (kHz) 260 Switching frequency (max) (kHz) 260 Features Enable, Over Current Protection Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Voltage mode Duty cycle (max) (%) 95 Type Converter
Vin (min) (V) 6.5 Vin (max) (V) 40 Vout (min) (V) 1.23 Vout (max) (V) 37 Iout (max) (A) 1 Iq (typ) (mA) 2.5 Switching frequency (min) (kHz) 260 Switching frequency (max) (kHz) 260 Features Enable, Over Current Protection Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Voltage mode Duty cycle (max) (%) 95 Type Converter
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 8 29.4 mm² 4.9 x 6 WSON (NHN) 16 25 mm² 5 x 5
  • Efficiency up to 96%
  • Available in 8-Pin SOIC, PDIP, and 16-Pin WSON
    Package
  • Requires only 5 External Components
  • 3.3-V, 5-V, 12-V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range: 1.21 V
    to 37 V
  • ±1.5% Maximum Output Voltage Tolerance Over
    Line and Load Conditions
  • Ensured 1-A Output Load Current
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-kHz Fixed Frequency Internal Oscillator
  • TTL Shutdown Capability, Low-Power Standby
    Mode
  • Thermal Shutdown and Current Limit Protection
  • Efficiency up to 96%
  • Available in 8-Pin SOIC, PDIP, and 16-Pin WSON
    Package
  • Requires only 5 External Components
  • 3.3-V, 5-V, 12-V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range: 1.21 V
    to 37 V
  • ±1.5% Maximum Output Voltage Tolerance Over
    Line and Load Conditions
  • Ensured 1-A Output Load Current
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-kHz Fixed Frequency Internal Oscillator
  • TTL Shutdown Capability, Low-Power Standby
    Mode
  • Thermal Shutdown and Current Limit Protection

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 1-A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 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 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 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 50-µA standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

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 1-A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 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 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 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 50-µA standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.
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Technical documentation

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Type Title Date
* Data sheet LM2675 SIMPLE SWITCHER® Power Converter High Efficiency 1-A Step-Down Voltage Regulator datasheet (Rev. F) PDF | HTML 29 Jun 2016
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Technical article How to increase system reliability and simplify design using DC/DC converters 13 Jun 2016
Technical article The importance of accurate switching frequency and current limit when selecting buck regulators 19 Apr 2016
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) PDF | HTML 19 Apr 2016
Technical article Advantages of leaded packages in robust industrial designs 08 Mar 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12 Sep 2014
Application note AN-1187 Leadless Leadframe Package (LLP) (Rev. R) 07 May 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
User guide LM2675 5.0EVAL 1A Step-Down High-Efficiency SIMPLE SWITCHER Eval Brd (Rev. C) 24 Apr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 Apr 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 Apr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23 Apr 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23 Apr 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23 Apr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 Apr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 Apr 2013
Application note AN-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
Application note Simple Techniques Minimize Cross-Coupling in Distributed Power Systems 21 Mar 2007
Application note Input and Output Capacitor Selection 19 Sep 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12 Jul 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) 03 May 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

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 (...)

User guide: PDF
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Simulation model

LM2675-ADJ PSpice Transient Model

SNVM533.ZIP (226 KB) - PSpice Model
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Simulation model

LM2675-ADJ TINA-TI Load Transient Reference Design

SNVMAT3.TSC (776 KB) - TINA-TI Reference Design
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Simulation model

LM2675-ADJ TINA-TI Startup Reference Design

SNVMAT4.TSC (782 KB) - TINA-TI Reference Design
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Simulation model

LM2675-ADJ TINA-TI Transient Spice Model

SNVMAT5.ZIP (57 KB) - TINA-TI Spice Model
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Simulation model

LM2675-ADJ Unencrypted PSpice Transient Model

SNVM876.ZIP (2 KB) - PSpice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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PDIP (P) 8 View options
SOIC (D) 8 View options
WSON (NHN) 16 View options
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