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 LM25005 LM25576 LM25576-Q1 LM2596 LM2599 LM2673 LM2676 LM2696 LM5005
1     1     1     1     1     1     1     1     1     1    
4     7     6     6     4.5     4.5     8     8     4.5     7    
40     42     42     42     40     40     40     40     24     75    
3.3     1.23     1.23     1.23     3.3     3.3     1.23     1.23     1.254     1.23    
37     37     40     40     37     37     37     37     20     70    
3     2.5     3     3     3     3     3     3     3     2.5    
Buck     Buck
Inverting Buck-Boost    
Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck    
  500     1000     1000       150     260     260       500    
  3.5     4.2     4.2         4.5     4.5       3.5    
  3     1     1       5     4.2     4.2     1     3    
  98     95     95         91     91       99    
  Adjustable     Adjustable     Adjustable         Adjustable     Fixed       Adjustable    
Internal     External     External     External     Internal     Internal     Internal     Internal       External    
  Enable
Frequency Synchronization    
Enable
Tracking    
Enable       Power Good     Enable     Enable     Power Good     Enable
Frequency Synchronization    
SIMPLE SWITCHER       SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER        
Voltage Mode     Current Mode     Current Mode     Current Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode       Current Mode    
  1.5     1.5     1.5         2     2       1.5    
Catalog     Catalog     Catalog     Automotive     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    
5DDPAK/TO-263
5TO-220    
20HTSSOP     20HTSSOP     20HTSSOP     5DDPAK/TO-263
5TO-220    
7DDPAK/TO-263
7TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
16HTSSOP     20HTSSOP    
1.19 | 1ku     1.40 | 1ku     2.00 | 1ku     2.30 | 1ku     1.80 | 1ku     2.05 | 1ku     1.85 | 1ku     1.80 | 1ku     1.70 | 1ku     1.75 | 1ku    

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