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LM2574: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A

Overview
Specifications
Datasheet: 0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
Rev. 9 (234kB)
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Product Overview
产品说明
The LM2574 Buck Switching Regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regulator (buck converter). All circuits of this series are capable of driving a 0.5 A loadwith excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version.

The Buck Switching Regulator is designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2574 are offered by several different inductor manufacturers.

Since the LM2574 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal linear regulators, especially with higher input voltages. In many cases, the power dissipated by the LM2574 regulator is so low, that no heatsink is required or its size could be reduced dramatically.

The LM2574 features include a guaranteed 4% tolerance on output voltage within specified input voltages and output load conditions, and +/-10%on the oscillator frequency (+/-2% over 0C to 125C). External shutdown is included, featuring 80 uA typical standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
特性
 
  • 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range of 1.23 V to 37 V +/-4%
  • Guaranteed 0.5 A Output Current
  • Wide Input Voltage Range: 4.75 V to 40 V
  • Requires Only 4 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
  • Moisture Sensitivity Level (MSL) Equals 1
应用   终端产品
  • Efficient Pre-Regulator for Linear Regulators
  • On-Card Switching Regulators
  • Power Supply for Battery Chargers
  • Simple and High-Efficiency Step-Down (Buck) Regulators
 

  • Automotive NCV Version Available
技术文档及设计资源
数据表 (1) 封装图纸 (2)
供货情况和样品
产品
状况
Compliance
具体说明
封装
MSL*
容器
预算价格 (1千个数量的单价)
类型
外形
类型
数量
LM2574DW-ADJR2G Active
Pb-free
Halide free
Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, Adjustable 1.23 V to 37 V SOIC-16W 751G-03 3 Tape and Reel 1000 $1.16
LM2574N-015G Last Shipments 
Pb-free
Halide free
Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 15 V PDIP-8 626-05 NA Tube 50  
LM2574N-12G Active
Pb-free
Halide free
Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 12 V PDIP-8 626-05 NA Tube 50 $1.16
LM2574N-3.3G Last Shipments 
Pb-free
Halide free
Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 3.3 V PDIP-8 626-05 NA Tube 50  
LM2574N-5G Active
Pb-free
Halide free
Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 5.0 V PDIP-8 626-05 NA Tube 50 $1.16
LM2574N-ADJG Active
Pb-free
Halide free
Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, Adjustable 1.23 V to 37 V PDIP-8 626-05 NA Tube 50 $1.16
NCV2574DW-ADJR2G Active
AEC Qualified
PPAP Capable
Pb-free
Halide free
Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, Adjustable 1.23 V to 37 V SOIC-16W 751G-03 3 Tape and Reel 1000 $1.2933
LM2574DW-ADJ Last Shipments
Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A SOIC-16W 751G-03 1 Tube 47  
NCV2574DW-ADJR2 Last Shipments
AEC Qualified
PPAP Capable
Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A SOIC-16W 751G-03 1 Tape and Reel 1000  
表面贴装器件的潮湿敏感度等级(MSL)(260°C回流温度时测量无铅,235°C回流温度时测量含铅)
市场订货至交货的时间(周) : 4 to 8
Digikey   (2015-07-09) : <1K
Mouser   (2015-07-09) : <1K
PandS   (2015-07-09) : <1K
市场订货至交货的时间(周) : Contact Factory
市场订货至交货的时间(周) : 2 to 4
Arrow   (Sat Jul 11 07:43:20 MST 2015) : 5
Digikey   (2015-07-09) : <1K
FutureElectronics   (2015-07-09) : <1K
Mouser   (2015-07-09) : <1K
ON Semiconductor   (2015-07-08) : 28,350
PandS   (2015-07-09) : >1K
市场订货至交货的时间(周) : Contact Factory
ON Semiconductor   (2015-07-08) : 791
市场订货至交货的时间(周) : 2 to 4
Arrow   (Sat Jul 11 07:43:20 MST 2015) : 1851
Digikey   (2015-07-09) : <1K
FutureElectronics   (2015-07-09) : >10K
Mouser   (2015-07-09) : >1K
ON Semiconductor   (2015-07-08) : 160,621
市场订货至交货的时间(周) : 2 to 4
Digikey   (2015-07-09) : <1K
FutureElectronics   (2015-07-09) : >1K
Mouser   (2015-07-09) : <100
ON Semiconductor   (2015-07-08) : 11,800
PandS   (2015-07-09) : >1K
市场订货至交货的时间(周) : 4 to 8
Avnet   (2015-07-09) : <1K
Mouser   (2015-07-09) : <1K
PandS   (2015-07-09) : <1K
市场订货至交货的时间(周) : Contact Factory
市场订货至交货的时间(周) : Contact Factory
Datasheet: 0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
Rev. 9 (234kB)
»浏览可靠性数据
»查看材料成分
»产品更改通知 (11)
Product Overview

Product Compliance Status Description Topology Control Mode VCC Min (V) VCC Max (V) VO Typ (V) IO Typ (A) Efficiency (%) fSW Typ (kHz) Package Type
 Pb-free 
 Halide free 
 Active     Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, Adjustable 1.23 V to 37 V   Step-Down   Voltage Mode   7   40   1.23 to 37   0.5   85   52   SOIC-16W 
 Pb-free 
 Halide free 
 Active     Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 12 V   Step-Down   Voltage Mode   7   40   12   0.5   85   52   PDIP-8 
 Pb-free 
 Halide free 
 Active     Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 5.0 V   Step-Down   Voltage Mode   7   40   5   0.5   85   52   PDIP-8 
 Pb-free 
 Halide free 
 Active     Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, Adjustable 1.23 V to 37 V   Step-Down   Voltage Mode   7   40   1.23 to 37   0.5   85   52   PDIP-8 
 AEC Qualified 
 PPAP Capable 
 Pb-free 
 Halide free 
 Active     Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, Adjustable 1.23 V to 37 V   Step-Down   Voltage Mode   7   40   1.23 to 37   0.5   85   52   SOIC-16W 
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