LM2576 (ACTIVE)

SIMPLE SWITCHER® 40V, 3A Low Component Count Step-Down Regulator

SIMPLE SWITCHER® 40V, 3A Low Component Count Step-Down Regulator - LM2576
 

Recommended alternative parts

  • LMZ14203  -  Looking for a power module? Try the LMZ14203
  • LM43603  -  3.5 to 36V, 3A Synchronous Step-Down Voltage Regulator - Higher efficiency, Low Quiescent Current, Smaller Solution Size
  • LMR14030  -  4 to 40V, 3.5A 2.2MHz Step-Down Voltage Regulator - Low Quiescent Current, Smaller Solution Size
  • LMR23630  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 

Description

The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3-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 fault protection and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required.

A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a ±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 3-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
LM2576 LM2575-N LM43603 LMR14030 LMR23630
4    4    3.5    4    4.5   
40    40    36    40    36   
3.3    3.3    1    1    1   
37    37    28    36    30   
3    1    3    3.5    3   
1    1    1    1    1   
42    42    200    200    200   
63    63    2200    2500    2200   
5    10    0.027    0.04    0.075   
Enable    Enable    Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Tracking
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Voltage Mode    Voltage Mode    Current Mode    Current Mode    Current Mode   
98    98    99    98    97   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Catalog    Catalog   
DDPAK/TO-263
TO-220   
DDPAK/TO-263
PDIP
SOIC
TO-220   
HTSSOP
SON   
SO PowerPAD    SO PowerPAD
SON   

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WEBENCH® Designer LM2576

  Min   Max Range
Vin  V 4.5 to 40.0V
Vout  V 1.23 to 37V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 125°C


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