SIMPLE SWITCHER® 3A Step-Down Voltage Regulator - LM2576

LM2576 (ACTIVE)

SIMPLE SWITCHER® 3A Step-Down Voltage Regulator

Recommended alternative parts

  • LM25005  -  Enhanced Package, More Efficient And Better Transient Response
  • LM25576  -  Enhanced Package, More Efficient And Better Transient Response
  • LM25576-Q1  -  Enhanced Package, More Efficient And Better Transient Response
  • LM2596  -  More Efficient
  • LM2599  -  Improved Switching Frequency, And Efficiency
  • LM2673  -  Much Improved Switching Frequency
  • LM2676  -  Much Improved Efficiency And Switching Frequency
  • LM2696  -  Higher Efficiency, Enhanced Package, Better Transient Response
  • LM5005  -  Higher Input Voltage, Higher Switching Frequency With Sync

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 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, 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 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 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

  • 3.3V, 5V, 12V, 15V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range,1.23V to 37V (57V for HV Version) ±4% Max Over Line and Load Conditions
  • Specified 3A Output Current
  • Wide Input Voltage Range, 40V Up to 60V 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
  • P+ Product Enhancement Tested

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Parametrics Compare all products in Step-Down (Buck) Converter

 
Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Topology
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Compensation
Special Features
Brand
Control Mode
Vref Accuracy (Typ) (%)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM2576 LM2576HV LM2596 LM2676 LM2678 LM22670 LM22677 LM22679 LM22678 LM22673 LM2575-N LM2575HV TPS54340
1     1     1     1     1     1     1     1     1     1     1     1     1    
4     4     4.5     8     8     4.5     4.5     4.5     4.5     4.5     4     4     4.5    
40     60     40     40     40     42     42     42     42     42     40     60     42    
3.3     3.3     3.3     1.23     1.23     1.285     1.285     1.285     1.285     1.285     3.3     3.3     0.8    
37     37     37     37     37     37     37     37     37     37     37     37     41    
3     3     3     3     5     3     5     5     5     3     1     1     3.5    
Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck
Inverting Buck-Boost    
      260     260     1000     1000     500     500     500         2500    
      4.5     7     4.2     7.1     7.1     7.1     4.2     3.2       5.5    
      4.2     4.2     3.4     3.4     3.4     3.4     3.4     5       0.146    
      91     91     90     90     90     90     90         98    
      Fixed     Fixed     Fixed     Fixed     Adjustable     Fixed     Adjustable         Fixed    
Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal     External    
      Enable     Enable     Enable     Enable     Enable     Enable           Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER      
Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Current Mode    
      2     2     1.5     1.5     1.5     1.5     1.5         1    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
5DDPAK/TO-263
5TO-220    
5DDPAK/TO-263
5TO-220    
5DDPAK/TO-263
5TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
7TO-263
8SO PowerPAD    
7TO-263     7TO-263     7TO-263     7TO-263
8SO PowerPAD    
16PDIP
24SOIC
5DDPAK/TO-263
5TO-220    
16PDIP
5DDPAK/TO-263
5TO-220
24SOIC    
8SO PowerPAD    
1.19 | 1ku     2.30 | 1ku     1.80 | 1ku     1.80 | 1ku     2.20 | 1ku     1.85 | 1ku     2.50 | 1ku     2.40 | 1ku     2.45 | 1ku     1.85 | 1ku     0.93 | 1ku     1.80 | 1ku     1.68 | 1ku    

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  • Simple High-Efficiency Step-Down (Buck) Regulator
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