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LM2671

現行

具 5 個外部零組件的 8V 至 40V、500mA SIMPLE SWITCHER® 降壓轉換器

立即訂購
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，但針腳輸出與所比較的裝置不同。
TLVM13620 現行 採用 4-mm x 6-mm x 1.8-mm 封裝的 3.6-V 至 36-V 輸入、1-V 至 6-V 輸出、2-A 降壓模組 Save board space, simplify design and speed time to market with an integrated-inductor power module.
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 Smaller solution size module
LMQ66430 現行 具有 1.5-µA IQ 的 36-V、3-A 低 EMI 同步降壓轉換器 Converter with low IQ and smaller in size
LMR54406 現行 4V 至 36V、0.6A、80µA Iq 同步降壓 SIMPLE SWITCHER® 電源轉換器 Newer converter with better feature set
TPSM365R6 現行 3-V 至 65-V 輸入、1-V 至 13-V 輸出、0.6-A 同步降壓轉換器電源模組 Smaller design with an integrated-inductor power module.

LM2671

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 Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0025 Duty cycle (max) (%) 95
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 Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0025 Duty cycle (max) (%) 95
SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm) PDIP (P) 8 92.5083 mm² (9.81 mm × 9.43 mm) WSON (NHN) 16 25 mm² (5 mm × 5 mm)
  • Efficiency up to 96%
  • Available in 8-Pin SOIC, PDIP, and WSON
    Packages
  • Simple and Easy to Design With
  • Requires Only 5 External Components
  • Uses Readily Available Standard Inductors
  • 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 500-mA Output Load Current
  • 0.25-Ω DMOS Output Switch
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-kHz Fixed Frequency Internal Oscillator
  • TTL Shutdown Capability, Low Power Standby
    Mode
  • Soft-Start and Frequency Synchronization
  • Thermal Shutdown and Current-Limit Protection
  • Efficiency up to 96%
  • Available in 8-Pin SOIC, PDIP, and WSON
    Packages
  • Simple and Easy to Design With
  • Requires Only 5 External Components
  • Uses Readily Available Standard Inductors
  • 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 500-mA Output Load Current
  • 0.25-Ω DMOS Output Switch
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-kHz Fixed Frequency Internal Oscillator
  • TTL Shutdown Capability, Low Power Standby
    Mode
  • Soft-Start and Frequency Synchronization
  • Thermal Shutdown and Current-Limit Protection

The LM2671 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 500-mA 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, fixed frequency oscillator, external shutdown, soft start, and frequency synchronization.

The LM2671 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what is required 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 required.

A family of standard inductors for use with the LM2671 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 ensured ±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 LM2671 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 500-mA 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, fixed frequency oscillator, external shutdown, soft start, and frequency synchronization.

The LM2671 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what is required 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 required.

A family of standard inductors for use with the LM2671 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 ensured ±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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open-in-new 比較替代產品
功能相同，但針腳輸出與所比較的裝置不同。
TPS560430 現行 4V 至 36V、0.6A 同步降壓 SIMPLE SWITCHER® 電源轉換器 Next-generation 36-V, 600-mA buck regulator with high-efficiency sleep mode.

技術文件

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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500-mA Step-Down Voltage Regulator With Features datasheet (Rev. L) PDF | HTML 2016/6/30
應用說明 Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 2024/3/25
應用說明 Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 2014/9/12
應用說明 AN-1187 Leadless Leadframe Package (LLP) (Rev. R) 2013/5/7
應用說明 AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 2013/4/24
應用說明 AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 2013/4/23
應用說明 AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 2013/4/23
應用說明 AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 2013/4/23
應用說明 AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 2013/4/23
應用說明 AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 2013/4/23
應用說明 AN-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E) 2013/4/23
應用說明 AN-1197 Selecting Inductors for Buck Converters (Rev. B) 2013/4/23
應用說明 AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 2013/4/23
應用說明 AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 2013/4/23
應用說明 Simple Techniques Minimize Cross-Coupling in Distributed Power Systems 2007/3/21
應用說明 Input and Output Capacitor Selection 2005/9/19
更多文件說明 SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 2005/7/12
應用說明 AN-643 EMI/RFI Board Design (Rev. B) 2004/5/3

設計與開發

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