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

Description: The LM2574 Buck Switching Regulators are monolithi...
  • 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.
  • Features
  • 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
  • Applications
  • Efficient Pre-Regulator for Linear Regulators
  • On-Card Switching Regulators
  • Power Supply for Battery Chargers
  • Simple and High-Efficiency Step-Down (Buck) Regulators
  • End Products

  • Automotive NCV Version Available
  • Technical Documentation & Design Resources
    Product Change Notification
    Availability and Samples
    LM2574DW-ADJR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, Adjustable 1.23 V to 37 V
  • Package Type: SOIC-16W
  • Package Case Outline: 751G-03
  • MSL: 3
  • Container Type: REEL
  • Container Qty: 1000
  • Inventory

  • Market Leadtime (weeks):Contact Factory
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  • Digikey:>1K
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  • Newark:<1K
  • PandS:<1K
  • LM2574N-015G
  • Status: Last Shipments
  • Compliance: Pb-free Halide free 
  • Description: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 15 V
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • LM2574N-12G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 12 V
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • Inventory

  • Market Leadtime (weeks):4 to 8
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  • Digikey:<1K
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  • LM2574N-3.3G
  • Status: Last Shipments
  • Compliance: Pb-free Halide free 
  • Description: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 3.3 V
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • LM2574N-5G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, 5.0 V
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • Inventory

  • Market Leadtime (weeks):Contact Factory
  • Arrow:0
  • Avnet:<100
  • Digikey:<1K
  • FutureElectronics:>10K
  • Mouser:<1K
  • Newark:<100
  • LM2574N-ADJG
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, Adjustable 1.23 V to 37 V
  • Package Type: PDIP-8
  • Package Case Outline: 626-05
  • MSL: NA
  • Container Type: TUBE
  • Container Qty: 50
  • Inventory

  • Market Leadtime (weeks):Contact Factory
  • Arrow:0
  • Digikey:<1K
  • Mouser:<1K
  • Newark:<100
  • PandS:>1K
  • NCV2574DW-ADJR2G
  • Status: Active
  • Compliance: AEC Qualified PPAP Capable Pb-free Halide free 
  • Description: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A, Adjustable 1.23 V to 37 V
  • Package Type: SOIC-16W
  • Package Case Outline: 751G-03
  • MSL: 3
  • Container Type: REEL
  • Container Qty: 1000
  • Inventory

  • Market Leadtime (weeks):Contact Factory
  • Arrow:0
  • Mouser:<1K
  • PandS:<1K
  • LM2574DW-ADJ
  • Status: Obsolete
  • Compliance: 
  • Description: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A
  • Package Type: SOIC-16W
  • Package Case Outline: 751G-03
  • MSL: 1
  • Container Type: TUBE
  • Container Qty: 47
  • NCV2574DW-ADJR2
  • Status: Obsolete
  • Compliance: AEC Qualified PPAP Capable 
  • Description: Buck Regulator, Switching, Adjustable Output Voltage, 0.5 A
  • Package Type: SOIC-16W
  • Package Case Outline: 751G-03
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 1000
  • Specifications
  • Topology: Step-Down 
  • Control Mode: Voltage Mode 
  • VCC Min (V):
  • VCC Max (V): 40 
  • VO Typ (V): 1.23 to 37  12 
  • IO Typ (A): 0.5 
  • Efficiency (%): 85 
  • fSW Typ (kHz): 52 
  • Package Type: SOIC-16W  PDIP-8 
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