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DC/DC 轉換器

LM2574

現行

具 4 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。
LMR54406 現行 4V 至 36V、0.6A、80µA Iq 同步降壓 SIMPLE SWITCHER® 電源轉換器 Next-generation synchronous buck converter with lower IQ in SOT-23 package.
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.
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.

LM2574

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) 4 Vout (max) (V) 37 Vout (min) (V) 3.3 Features Enable, Overcurrent protection Control mode Voltage mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.005 Duty cycle (max) (%) 98
Rating Catalog Topology Buck Iout (max) (A) 0.5 Vin (max) (V) 40 Vin (min) (V) 4 Vout (max) (V) 37 Vout (min) (V) 3.3 Features Enable, Overcurrent protection Control mode Voltage mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.005 Duty cycle (max) (%) 98
PDIP (P) 8 92.5083 mm² (9.81 mm × 9.43 mm) SOIC (NPA) 14 92.8372375 mm² (8.9915 mm × 10.325 mm)
  • New product available: TPS560430, 36-V, 600-mA synchronous step-down converter
  • 3.3-V, 5-V, 12-V, 15-V, and adjustable output versions
  • Adjustable version output voltage range: 1.23 V to 37 V (57 V for HV version) ±4% maximum over line and load conditions
  • Specified 0.5-A output current
  • Wide input voltage range: 40 V, up to 60 V for HV Version
  • Requires only four external components
  • 52-kHz Fixed-frequency internal oscillator
  • TTL shutdown capability, low-power standby mode
  • High efficiency
  • Uses readily available standard inductors
  • Thermal shutdown and current-limit protection
  • Create a custom design using the LM2574 with the WEBENCH® Power Designer
  • New product available: TPS560430, 36-V, 600-mA synchronous step-down converter
  • 3.3-V, 5-V, 12-V, 15-V, and adjustable output versions
  • Adjustable version output voltage range: 1.23 V to 37 V (57 V for HV version) ±4% maximum over line and load conditions
  • Specified 0.5-A output current
  • Wide input voltage range: 40 V, up to 60 V for HV Version
  • Requires only four external components
  • 52-kHz Fixed-frequency internal oscillator
  • TTL shutdown capability, low-power standby mode
  • High efficiency
  • Uses readily available standard inductors
  • Thermal shutdown and current-limit protection
  • Create a custom design using the LM2574 with the WEBENCH® Power Designer

The LM2574xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.

The LM2574xx series offers a high-efficiency replacement for popular three-terminal linear regulators. Because of its high efficiency, the copper traces on the printed-circuit board (PCB) are normally the only heat sinking needed.

A standard series of inductors optimized for use with the LM2574 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a specified ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50-µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

The TPS560430 is a newer generation buck converter, being functionally equivalent to LM2574. It offers reduced BOM cost, increased efficiency, and reduced solution size. See the Device Comparison Table to compare specifications. Start WEBENCH Design with TPS560430.

The LM2574xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.

The LM2574xx series offers a high-efficiency replacement for popular three-terminal linear regulators. Because of its high efficiency, the copper traces on the printed-circuit board (PCB) are normally the only heat sinking needed.

A standard series of inductors optimized for use with the LM2574 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a specified ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50-µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

The TPS560430 is a newer generation buck converter, being functionally equivalent to LM2574. It offers reduced BOM cost, increased efficiency, and reduced solution size. See the Device Comparison Table to compare specifications. Start WEBENCH Design with TPS560430.
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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 LM2574/LM2574HV SIMPLE SWITCHER® 0.5-A Step-Down Voltage Regulator datasheet (Rev. F) 2020/4/17
應用說明 Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 2024/3/25
應用說明 Switching regulator fundamentals (Rev. C) PDF | HTML 2019/2/5
技術文章 Quantifying the value of wide VIN PDF | HTML 2016/6/15
技術文章 How to increase system reliability and simplify design using DC/DC converters PDF | HTML 2016/6/13
技術文章 DC/DC converter datasheets – System losses demystified PDF | HTML 2016/4/25
技術文章 The importance of accurate switching frequency and current limit when selecting bu PDF | HTML 2016/4/19
技術文章 DC/DC converter datasheets – System efficiency demystified PDF | HTML 2016/4/18
技術文章 Advantages of leaded packages in robust industrial designs PDF | HTML 2016/3/8
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-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 Buck Converters Provide a Battery Charger and System Power 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

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支援軟體

SWITCHERSMADESIMPLE-SW — Switchers Made Simple® Software

Note: The Switchers Made Simple design computations have been incorporated into Texas Instruments' award winning WEBENCH Power Designer Online Design Tool. Please use TI's WEBENCH Power Designer online tools for new designs. The WEBENCH Design Tool also includes:

  • Visual design optimization for (...)
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模擬型號

LM2574 PSpice Transient Model

SNVMB20.ZIP (41 KB) - PSpice 模型
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模擬型號

LM2574 Unencrypted PSpice Transient Model

SNVMB19.ZIP (2 KB) - PSpice 模型
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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 (NPA) 14 Ultra Librarian
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