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

Datasheet: 0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
Rev. 9 (234kB)
Product Overview
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» Product Change Notification
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   End Products
  • 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
Technical Documentation & Design Resources
Data Sheets (1) Package Drawings (2)
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
LM2574DW-ADJR2G Active
Pb-free
Halide free
LM2574, Adjustable 1.23 V to 37 V SOIC-16W 751G-03 3 260 Tape and Reel 1000 $0.9312
LM2574N-015G Obsolete 
Pb-free
Halide free
LM2574, 15 V PDIP-8 626-05 NA Tube 50  
LM2574N-12G Active
Pb-free
Halide free
LM2574, 12 V PDIP-8 626-05 NA Tube 50 $0.9312
LM2574N-3.3G Obsolete 
Pb-free
Halide free
LM2574, 3.3 V PDIP-8 626-05 NA Tube 50  
LM2574N-5G Active
Pb-free
Halide free
LM2574, 5.0 V PDIP-8 626-05 NA Tube 50 $0.7141
LM2574N-ADJG Active
Pb-free
Halide free
LM2574, Adjustable 1.23 V to 37 V PDIP-8 626-05 NA Tube 50 $0.7694
NCV2574DW-ADJR2G Active
AEC Qualified
PPAP Capable
Pb-free
Halide free
LM2574, Adjustable 1.23 V to 37 V SOIC-16W 751G-03 3 260 Tape and Reel 1000 $1.2933
LM2574DW-ADJ Obsolete
LM2574 SOIC-16W 751G-03 1 235 Tube 47  
NCV2574DW-ADJR2 Obsolete
AEC Qualified
PPAP Capable
LM2574 SOIC-16W 751G-03 1 235 Tape and Reel 1000  
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : <1K
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 2 to 4
PandS   (2020-09-14 00:00) : >1K
ON Semiconductor   (2020-09-02 00:00) : 8,950
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 17 to 20
Avnet   (2020-08-19 00:00) : >1K
FutureElectronics   (2020-08-19 00:00) : >1K
Market Leadtime (weeks) : 13 to 16
Avnet   (2020-08-19 00:00) : >1K
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : 2 to 4
PandS   (2020-09-14 00:00) : <1K
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory

Product
Description
Pricing ($/Unit)
Compliance
Status
Topology
Control Mode
VCC Min (V)
VCC Max (V)
VO Typ (V)
IO Typ (A)
Efficiency (%)
fSW Typ (kHz)
Package Type
LM2574DW-ADJR2G  
 $0.9312 
Pb
H
 Active   
Step-Down
Voltage Mode
7
40
1.23 to 37
0.5
85
52
SOIC-16W
LM2574N-12G  
 $0.9312 
Pb
H
 Active   
Step-Down
Voltage Mode
7
40
12
0.5
85
52
PDIP-8
LM2574N-5G  
 $0.7141 
Pb
H
 Active   
Step-Down
Voltage Mode
7
40
5
0.5
85
52
PDIP-8
LM2574N-ADJG  
 $0.7694 
Pb
H
 Active   
Step-Down
Voltage Mode
7
40
1.23 to 37
0.5
85
52
PDIP-8
NCV2574DW-ADJR2G  
 $1.2933 
Pb
A
H
P
 Active   
Step-Down
Voltage Mode
7
40
1.23 to 37
0.5
85
52
SOIC-16W
Case Outlines
626-05    751G-03   
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