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DC/DC 轉換器

LM2673

現行

具有可調式電流限制的 8V 至 40V、3A 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。
LMR51430 現行 具 40µA IQ 的 SIMPLE SWITCHER® 4.5V 至 36V、3A 同步降壓轉換器 New converter in SOT-23 package
TLVM13630 現行 高密度、3-V 至 36-V 輸入、1-V 至 6-V 輸出、3-A 降壓電源模組 Save board space, simplify design and speed time to market with an integrated-inductor power module.

LM2673

現行
立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 3 Vin (max) (V) 40 Vin (min) (V) 8 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) 0.0042 Duty cycle (max) (%) 91
Rating Catalog Topology Buck Iout (max) (A) 3 Vin (max) (V) 40 Vin (min) (V) 8 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) 0.0042 Duty cycle (max) (%) 91
VSON (NHM) 14 30 mm² (6 mm × 5 mm) TO-220 (NDZ) 7 82.6008 mm² (10.16 mm × 8.13 mm) TO-263 (KTW) 7 153.924 mm² (10.1 mm × 15.24 mm)
  • Efficiency Up to 94%
  • Simple and Easy to Design With (Using Off-The-
    Shelf External Components)
  • Resistor Programmable Peak Current Limit Over a
    Range of 2 A to 5 A
  • 150-mΩ DMOS Output Switch
  • 3.3-V, 5-V, 12-V Fixed Output and Adjustable
    (1.2 V to 37 V) Versions
  • ±2% Maximum Output Tolerance Over Full Line
    and Load Conditions
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-KHz Fixed Frequency Internal Oscillator
  • Soft-Start Capability
  • –40 to 125°C Operating Junction Temperature
    Range
  • Efficiency Up to 94%
  • Simple and Easy to Design With (Using Off-The-
    Shelf External Components)
  • Resistor Programmable Peak Current Limit Over a
    Range of 2 A to 5 A
  • 150-mΩ DMOS Output Switch
  • 3.3-V, 5-V, 12-V Fixed Output and Adjustable
    (1.2 V to 37 V) Versions
  • ±2% Maximum Output Tolerance Over Full Line
    and Load Conditions
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-KHz Fixed Frequency Internal Oscillator
  • Soft-Start Capability
  • –40 to 125°C Operating Junction Temperature
    Range

The LM2673 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 3-A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3 V, 5 V, and 12 V and an adjustable output version.

The SIMPLE SWITCHER® concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260 kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2673 are available from several manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input surge current at power on by adding a soft-start timing capacitor to gradually turn on the regulator. The LM2673 series also has built-in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

The LM2673 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 3-A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3 V, 5 V, and 12 V and an adjustable output version.

The SIMPLE SWITCHER® concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260 kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2673 are available from several manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input surge current at power on by adding a soft-start timing capacitor to gradually turn on the regulator. The LM2673 series also has built-in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.
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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 LM2673 SIMPLE SWITCHER® 3-A Step-Down Voltage Regulator With Adjustable Current Limit datasheet (Rev. O) PDF | HTML 2016/6/30
應用說明 Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 2024/3/25
技術文章 DC/DC converter datasheets - Calculate system losses PDF | HTML 2016/5/2
技術文章 DC/DC converter datasheets – System losses demystified PDF | HTML 2016/4/25
技術文章 DC/DC converter datasheets – System efficiency demystified PDF | HTML 2016/4/18
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-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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開發板

LM2673-5.0EVAL — 具有可調整電流限制的 SIMPLE SWITCHER® 3A 降壓式穩壓器評估模組

Simple Switcher 3A Step-Down Voltage Regulatory with Adjustable Current Limit

使用指南: PDF
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模擬型號

LM2673 TINA-TI Load Transient Reference Design (Rev. A)

SNVM513A.TSC (99 KB) - TINA-TI 參考設計
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模擬型號

LM2673 TINA-TI start-up Transient Reference Design (Rev. A)

SNVM514A.TSC (139 KB) - TINA-TI 參考設計
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模擬型號

LM2673 TINA-TI TRANSIENT SPICE MODEL (Rev. A)

SNVM512A.ZIP (13 KB) - TINA-TI Spice 模型
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模擬型號

LM2673 Unencrypted PSpice Transient Model Package (Rev. B)

SNVM486B.ZIP (215 KB) - PSpice 模型
支援產品和硬體
封裝 針腳 CAD 符號、佔位空間與 3D 模型
VSON (NHM) 14 Ultra Librarian
TO-220 (NDZ) 7 Ultra Librarian
TO-263 (KTW) 7 Ultra Librarian
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