LM2675

ACTIVE

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

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Product details

Parameters

Vin (Min) (V) 6.5 Vin (Max) (V) 40 Vout (Min) (V) 1.23 Vout (Max) (V) 37 Iout (Max) (A) 1 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 260 Switching frequency (Max) (kHz) 260 Features Enable, Over Current Protection Control mode Voltage Mode Duty cycle (Max) (%) 95 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 4.9 x 3.9 WSON (NHN) 16 25 mm² 5 x 5 open-in-new Find other Buck converters (integrated switch)

Features

  • 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
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Description

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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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LMR33610 ACTIVE SIMPLE SWITCHER® 3.8-V to 36-V, 1-A synchronous step-down converter in SOIC-8 package Next-generation 3.8-V to 36-V, 1-A synchronous step-down converter in SOIC-8 package.

Technical documentation

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Type Title Date
* Datasheet LM2675 SIMPLE SWITCHER® Power Converter High Efficiency 1-A Step-Down Voltage Regulator datasheet (Rev. F) Jun. 29, 2016
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical articles More components, more problems Jun. 13, 2016
Technical articles Have you been had? Check the stated vs. actual current limit Apr. 19, 2016
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles SIMPLE SWITCHER regulators deliver a powerful punch for years Mar. 08, 2016
Application notes Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
Application notes AN-1187 Leadless Leadframe Package (LLP) (Rev. R) May 07, 2013
Application notes AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
User guides LM2675 5.0EVAL 1A Step-Down High-Efficiency SIMPLE SWITCHER Eval Brd (Rev. C) Apr. 24, 2013
Application notes AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application notes AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr. 23, 2013
Application notes AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
Application notes AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) Apr. 23, 2013
Application notes AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application notes AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application notes AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application notes AN-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E) Apr. 23, 2013
Application notes AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
Application notes Simple Techniques Minimize Cross-Coupling in Distributed Power Systems Mar. 21, 2007
Application notes Input and Output Capacitor Selection Sep. 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application notes AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$25.00
Description

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 would (...)

Design tools & simulation

SIMULATION MODELS Download
SNVM533.ZIP (226 KB) - PSpice Model
SIMULATION MODELS Download
SNVM876.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAT3.TSC (776 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMAT4.TSC (782 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMAT5.ZIP (57 KB) - TINA-TI Spice Model

CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options
WSON (NHN) 16 View options

Ordering & quality

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