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AC/DC 和 DC/DC 轉換器 (整合式 FET)

LM2674

現行

SIMPLE SWITCHER® 40V、500mA 低零組件數降壓穩壓器

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產品規格表

現在提供此產品的更新版本

open-in-new 比較替代產品
功能相同，但引腳輸出與所比較的裝置不同
LMR54406 現行 4V 至 36V、0.6A、80µA Iq 同步降壓 SIMPLE SWITCHER® 電源轉換器 Next-generation converter with lower IQ and improved feature set.
LMZM23600 現行 採用 3.8-mm × 3-mm 封裝的 36-V、0.5-A 降壓 DC/DC 電源模組 Small solution size module

LM2674

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 0.5 Vin (max) (V) 40 Vin (min) (V) 6.5 Vout (max) (V) 37 Vout (min) (V) 1.23 Features Enable, Overcurrent protection Control mode Voltage mode Switching frequency (min) (kHz) 260 Switching frequency (max) (kHz) 260 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 2500 Duty cycle (max) (%) 95 Type Converter
Rating Catalog Topology Buck Iout (max) (A) 0.5 Vin (max) (V) 40 Vin (min) (V) 6.5 Vout (max) (V) 37 Vout (min) (V) 1.23 Features Enable, Overcurrent protection Control mode Voltage mode Switching frequency (min) (kHz) 260 Switching frequency (max) (kHz) 260 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 2500 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
  • New product available:
  • For faster time to market:
  • Efficiency up to 96%
  • Available in 8-pin SOIC, PDIP, and 16-pin WSON packages
  • Simple and easy to design with
  • Requires only five external components
  • Uses readily available standard inductors
  • 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 500mA output load current
  • 0.25Ω DMOS output switch
  • 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 LM2674 with the WEBENCH® Power Designer
  • New product available:
  • For faster time to market:
  • Efficiency up to 96%
  • Available in 8-pin SOIC, PDIP, and 16-pin WSON packages
  • Simple and easy to design with
  • Requires only five external components
  • Uses readily available standard inductors
  • 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 500mA output load current
  • 0.25Ω DMOS output switch
  • 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 LM2674 with the WEBENCH® Power Designer

The LM2674 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 500mA 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 LM2674 series operates at a switching frequency of 260kHz, thus allowing smaller sized filter components than what is required with lower frequency switching regulators. Because of very high efficiency (> 90%), the copper traces on the printed-circuit board are the only heat sinking required.

A family of standard inductors for use with the LM2674 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 a specified ±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 standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

The LM2674 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 500mA 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 LM2674 series operates at a switching frequency of 260kHz, thus allowing smaller sized filter components than what is required with lower frequency switching regulators. Because of very high efficiency (> 90%), the copper traces on the printed-circuit board are the only heat sinking required.

A family of standard inductors for use with the LM2674 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 a specified ±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 standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.
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類型 標題 日期
* Data sheet LM2674 SIMPLE SWITCHER® Power Converter, High-Efficiency, 500mA, Step-Down Voltage Regulator datasheet (Rev. I) PDF | HTML 2025年 6月 25日
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 2024年 3月 25日
Technical article How to increase system reliability and simplify design using DC/DC converters PDF | HTML 2016年 6月 13日
Technical article The importance of accurate switching frequency and current limit when selecting bu PDF | HTML 2016年 4月 19日
Technical article Advantages of leaded packages in robust industrial designs PDF | HTML 2016年 3月 8日
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 2014年 9月 12日
Application note AN-1187 Leadless Leadframe Package (LLP) (Rev. R) 2013年 5月 7日
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 2013年 4月 24日
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 2013年 4月 23日
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 2013年 4月 23日
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 2013年 4月 23日
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 2013年 4月 23日
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 2013年 4月 23日
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 2013年 4月 23日
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 2013年 4月 23日
Application note AN-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E) 2013年 4月 23日
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 2013年 4月 23日
Application note Simple Techniques Minimize Cross-Coupling in Distributed Power Systems 2007年 3月 21日
Application note Input and Output Capacitor Selection 2005年 9月 19日
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 2005年 7月 12日
Application note AN-643 EMI/RFI Board Design (Rev. B) 2004年 5月 3日

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封裝 針腳 CAD 符號、佔位空間與 3D 模型
PDIP (P) 8 Ultra Librarian
SOIC (D) 8 Ultra Librarian
WSON (NHN) 16 Ultra Librarian
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