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AC/DC & DC/DC converters (integrated FET)

LM2678

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8V 至 40V、5A SIMPLE SWITCHER® 高效降压转换器

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功能与比较器件相同但引脚有所不同
LMR51450 正在供货 36V、5A 同步降压转换器 Next-generation synchronous buck converter in ultra-small WSON package.
TLVM13660 正在供货 采用 5mm x 5.5mm 增强型 HotRod™ QFN 封装的 36V 输入、1V 至 6V 输出、6A 降压电源模块 Save board space, simplify design and speed time to market with an integrated-inductor power module.

LM2678

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产品详情

Iout (max) (A) 5 Vin (min) (V) 8 Vin (max) (V) 40 Type Converter Switching frequency (min) (kHz) 260 Switching frequency (max) (kHz) 260 Features Frequency synchronization, Over Current Protection Control mode Voltage mode Vout (min) (V) 1.23 Vout (max) (V) 37 Rating Catalog Operating temperature range (°C) -40 to 125
Iout (max) (A) 5 Vin (min) (V) 8 Vin (max) (V) 40 Type Converter Switching frequency (min) (kHz) 260 Switching frequency (max) (kHz) 260 Features Frequency synchronization, Over Current Protection Control mode Voltage mode Vout (min) (V) 1.23 Vout (max) (V) 37 Rating Catalog Operating temperature range (°C) -40 to 125
TO-220 (NDZ) 7 82.6008 mm² 10.16 x 8.13 TO-263 (KTW) 7 153.924 mm² 10.1 x 15.24 VSON (NHM) 14 30 mm² 6 x 5
  • Efficiency Up to 92%
  • Simple and Easy to Design Using Off-the-Shelf External Components
  • 120-mΩ DMOS Output Switch
  • 3.3-V, 5-V, and 12-V Fixed Output and Adjustable (1.2 V to 37 V) Versions
  • 50-µA Standby Current When Switched OFF
  • ±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
  • –40 to 125°C Operating Junction Temperature Range
  • Create a Custom Design Using the LM2678 With the WEBENCH® Power Designer
  • Efficiency Up to 92%
  • Simple and Easy to Design Using Off-the-Shelf External Components
  • 120-mΩ DMOS Output Switch
  • 3.3-V, 5-V, and 12-V Fixed Output and Adjustable (1.2 V to 37 V) Versions
  • 50-µA Standby Current When Switched OFF
  • ±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
  • –40 to 125°C Operating Junction Temperature Range
  • Create a Custom Design Using the LM2678 With the WEBENCH® Power Designer

The LM2678 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 5-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 LM2678 are available from several manufacturers to greatly simplify the design process.

The LM2678 series also has built-in thermal shutdown, current limiting, and an ON/OFF control input that can power down the regulator to a low 50-µA quiescent current standby condition. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

The LM2678 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 5-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 LM2678 are available from several manufacturers to greatly simplify the design process.

The LM2678 series also has built-in thermal shutdown, current limiting, and an ON/OFF control input that can power down the regulator to a low 50-µA quiescent current standby condition. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.
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技术文档

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类型 标题 下载最新的英语版本 日期
* 数据表 LM2678 SIMPLE SWITCHER High Efficiency 5-A Step-Down Voltage Regulator 数据表 (Rev. K) PDF | HTML 2017年 1月 13日
应用手册 Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 2024年 3月 25日
技术文章 Quantifying the value of wide VIN PDF | HTML 2016年 6月 15日
技术文章 DC/DC converter datasheets – System losses demystified PDF | HTML 2016年 4月 25日
技术文章 DC/DC converter datasheets – System efficiency demystified PDF | HTML 2016年 4月 18日
应用手册 Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 2014年 9月 12日
应用手册 AN-1187 Leadless Leadframe Package (LLP) (Rev. R) 2013年 5月 7日
EVM 用户指南 AN-1135 LM267X 3A, 5A Evaluation Boards (Rev. D) 2013年 4月 24日
应用手册 AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 2013年 4月 24日
应用手册 AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 2013年 4月 23日
应用手册 AN-1197 Selecting Inductors for Buck Converters (Rev. B) 2013年 4月 23日
应用手册 AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 2013年 4月 23日
应用手册 AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 2013年 4月 23日
应用手册 AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 2013年 4月 23日
应用手册 AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 2013年 4月 23日
应用手册 AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 2013年 4月 23日
应用手册 AN-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E) 2013年 4月 23日
应用手册 AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 2013年 4月 23日
应用手册 Simple Techniques Minimize Cross-Coupling in Distributed Power Systems 2007年 3月 21日
应用手册 Input and Output Capacitor Selection 2005年 9月 19日
更多文献资料 SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 2005年 7月 12日
应用手册 AN-643 EMI/RFI Board Design (Rev. B) 2004年 5月 3日

设计和开发

如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。

仿真模型

LM2678 Unencrypted PSpice Average Model

SNVM879.ZIP (1 KB) - PSpice Model
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仿真模型

LM2678 Unencrypted PSpice Average Model Package (Rev. A)

SNVM039A.ZIP (56 KB) - PSpice Model
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仿真模型

LM2678 Unencrypted PSpice Transient Model

SNVM880.ZIP (3 KB) - PSpice Model
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仿真模型

LM2678 Unencrypted PSpice Transient Model Package (Rev. A)

SNVM038A.ZIP (63 KB) - PSpice Model
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封装 引脚 下载
TO-220 (NDZ) 7 查看选项
TO-263 (KTW) 7 查看选项
VSON (NHM) 14 查看选项
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订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息：
  • 制造厂地点
  • 封装厂地点

支持和培训

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