LM2574 (ACTIVE)

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

 

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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

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Parametrics Compare all products in Buck Converter (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
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
SOIC   
PDIP
SOIC   

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WEBENCH® Designer LM2574

  Min   Max Range
Vin  V 4.5 to 40.0V
Vout  V 1.23 to 37.0V
Iout  A ≤ 0.5A
Ambient Temp  °C -40 to 125°C


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