LM2574 SIMPLE SWITCHER 4V to 40V, 0.5A Step-Down DC/DC Switching Regulator | TI.com

LM2574 (ACTIVE)

SIMPLE SWITCHER 4V to 40V, 0.5A Step-Down DC/DC Switching Regulator

 

Recommended alternative parts

  • LMZ34202  -  Looking for a power module? Try the LMZ34202
  • LM43600  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Synchronous 36V, 500mA Regulator - Higher efficiency, Low Quiescent Current, Smaller Solution Size

Description

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.

Features

  • 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 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
  • Create a Custom Design Using the LM2574 With the WEBENCH® Power Designer

All trademarks are the property of their respective owners.

View more

Parametrics Compare all products in Buck converters (integrated switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
Type
LM2574 LM2574HV
4     4    
40     60    
3.3     3.3    
37     37    
0.5     0.5    
1     1    
52     52    
52     52    
5     5    
Enable     Enable    
Voltage Mode     Voltage Mode    
98     98    
-40 to 125     -40 to 125    
Catalog     Catalog    
PDIP | 8
SOIC | 14    
PDIP | 8
SOIC | 14    
Converter     Converter    

Design tool

New!
WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM2574

  Min   Max Range
Vin  V 4.5 to 40.0V
Vout  V 1.23 to 37V
Iout  A ≤ 0.5A
Ambient Temp  °C -40 to 125°C


Footprint BOM Cost Efficiency


Preview design