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LM22674

ACTIVE

4.5V to 42V, 500mA SIMPLE SWITCHER® buck converter with precision enable

A newer version of this product is available

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Product details

Vin (min) (V) 4.5 Vin (max) (V) 42 Vout (min) (V) 1.285 Vout (max) (V) 37 Iout (max) (A) 0.5 Iq (typ) (mA) 3.4 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Enable, Over Current Protection Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Voltage mode Duty cycle (max) (%) 90 Type Converter
Vin (min) (V) 4.5 Vin (max) (V) 42 Vout (min) (V) 1.285 Vout (max) (V) 37 Iout (max) (A) 0.5 Iq (typ) (mA) 3.4 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Enable, Over Current Protection Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Voltage mode Duty cycle (max) (%) 90 Type Converter
HSOIC (DDA) 8 29.4 mm² 4.9 x 6
  • Wide Input Voltage Range: 4.5 V to 42 V
  • Internally Compensated Voltage Mode Control
  • Stable with Low ESR Ceramic Capacitors
  • 200 mΩ N-Channel MOSFET
  • Output Voltage Options:
    -ADJ (Outputs as Low as 1.285 V)
    -5.0 (Output Fixed to 5 V)
  • ±1.5% Feedback Reference Accuracy
  • Switching Frequency of 500 kHz
  • –40°C to 125°C Operating Junction
    Temperature Range
  • Precision Enable Pin
  • Integrated Boot-Strap Diode
  • Integrated Soft-Start
  • Fully WEBENCH® Enabled
  • LM22674-Q1 is an Automotive Grade Product
    that is AEC-Q100 Grade 1 Qualified
    (–40°C to +125°C Operating Junction
    Temperature)
  • SO PowerPAD (Exposed Pad)
  • Wide Input Voltage Range: 4.5 V to 42 V
  • Internally Compensated Voltage Mode Control
  • Stable with Low ESR Ceramic Capacitors
  • 200 mΩ N-Channel MOSFET
  • Output Voltage Options:
    -ADJ (Outputs as Low as 1.285 V)
    -5.0 (Output Fixed to 5 V)
  • ±1.5% Feedback Reference Accuracy
  • Switching Frequency of 500 kHz
  • –40°C to 125°C Operating Junction
    Temperature Range
  • Precision Enable Pin
  • Integrated Boot-Strap Diode
  • Integrated Soft-Start
  • Fully WEBENCH® Enabled
  • LM22674-Q1 is an Automotive Grade Product
    that is AEC-Q100 Grade 1 Qualified
    (–40°C to +125°C Operating Junction
    Temperature)
  • SO PowerPAD (Exposed Pad)

The LM22674 switching regulator provides all of the functions necessary to implement an efficient high voltage step-down (buck) regulator using a minimum of external components. This easy to use regulator incorporates a 42 V N-channel MOSFET switch capable of providing up to 500 mA of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5 V output and adjustable output voltage options are available. A switching frequency of 500 kHz allows for small external components and good transient response. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typ). Built in soft-start (500 µs, typ) saves external components. The LM22674 also has built in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22674 device is a member of Texas Instruments’ SIMPLE SWITCHER® family. The SIMPLE SWITCHER® concept provides for an easy to use complete design using a minimum number of external components and the TI WEBENCH® design tool. TI’s WEBENCH® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.

The LM22674 switching regulator provides all of the functions necessary to implement an efficient high voltage step-down (buck) regulator using a minimum of external components. This easy to use regulator incorporates a 42 V N-channel MOSFET switch capable of providing up to 500 mA of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5 V output and adjustable output voltage options are available. A switching frequency of 500 kHz allows for small external components and good transient response. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typ). Built in soft-start (500 µs, typ) saves external components. The LM22674 also has built in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22674 device is a member of Texas Instruments’ SIMPLE SWITCHER® family. The SIMPLE SWITCHER® concept provides for an easy to use complete design using a minimum number of external components and the TI WEBENCH® design tool. TI’s WEBENCH® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.

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Technical documentation

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Type Title Date
* Data sheet LM22674/-Q1 42 V, 500 mA SIMPLE SWITCHER® Step-Down Voltage Regulator with Features datasheet (Rev. M) PDF | HTML 04 Nov 2014
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Quantifying the value of wide VIN PDF | HTML 15 Jun 2016
Technical article DC/DC converter datasheets – System losses demystified PDF | HTML 25 Apr 2016
Technical article DC/DC converter datasheets – System efficiency demystified PDF | HTML 18 Apr 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-1533 Overvoltage Protection Circuit for Automotive Load Dump (Rev. B) 06 May 2013
Application note AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) 06 May 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (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-2020 Thermal Design By Insight, Not Hindsight (Rev. C) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
Application note SIMPLE SWITCHER Regulators Take Over Automotive Applications (Rev. A) 23 Apr 2013
Design guide SIMPLE SWITCHER® Design Guide 11 Apr 2011
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

LM22671EVAL — LM22671 0.5A SIMPLE SWITCHER Regulator w/ Freq Adj or Synch and Precision Enable EVM

The LM22671 evaluation board is designed to demonstrate the capabilities of the LM22671switching regulator. The LM22671 evaluation board is configured to provide an output voltage of 3.3V up to 500 mA load current with an input voltage range of 4.5V to 42V. The typical operating frequency is 500 (...)

User guide: PDF
Not available on TI.com
Simulation model

LM22674-5.0 PSpice Average Model

SNVM178.ZIP (52 KB) - PSpice Model
Simulation model

LM22674-5.0 PSpice Transient Model (Rev. A)

SNVM177A.ZIP (209 KB) - PSpice Model
Simulation model

LM22674-5.0 TINA-TI Average Reference Design

SNVM180.TSC (142 KB) - TINA-TI Reference Design
Simulation model

LM22674-5.0 TINA-TI Average Spice Model

SNVM179.ZIP (8 KB) - TINA-TI Spice Model
Simulation model

LM22674-5.0 TINA-TI Transient Line Reference Design

SNVM173.TSC (186 KB) - TINA-TI Reference Design
Simulation model

LM22674-5.0 TINA-TI Transient Load Reference Design

SNVM172.TSC (184 KB) - TINA-TI Reference Design
Simulation model

LM22674-5.0 TINA-TI Transient Spice Model

SNVM175.ZIP (20 KB) - TINA-TI Spice Model
Simulation model

LM22674-5.0 TINA-TI Transient Startup Reference Design

SNVM176.TSC (219 KB) - TINA-TI Reference Design
Simulation model

LM22674-5.0 TINA-TI Transient Steady State Reference Design

SNVM174.TSC (226 KB) - TINA-TI Reference Design
Simulation model

LM22674-5.0 Unencrypted PSpice Average Model

SNVM925.ZIP (1 KB) - PSpice Model
Simulation model

LM22674-5.0 Unencrypted PSpice Transient Model

SNVM926.ZIP (4 KB) - PSpice Model
Simulation model

LM22674-ADJ PSpice Average Model

SNVM312.ZIP (53 KB) - PSpice Model
Simulation model

LM22674-ADJ PSpice Transient Model

SNVM313.ZIP (208 KB) - PSpice Model
Simulation model

LM22674-ADJ Unencrypted PSpice Average Model

SNVM900.ZIP (1 KB) - PSpice Model
Simulation model

LM22674-ADJ Unencrypted PSpice Transient Model

SNVM899.ZIP (4 KB) - PSpice Model
Calculation tool

LM2267X-22680DESIGN-CALC — LM2267x, LM22680 Quick Start Simple Switcher Component Calculator

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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HSOIC (DDA) 8 View options

Ordering & quality

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Information included:
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  • Assembly location

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