SIMPLE SWITCHER® 3A Step-Down Voltage Regulator - LM2576HV


SIMPLE SWITCHER® 3A Step-Down Voltage Regulator

Recommended alternative parts

  • LM5005  -  75V Vin, 2.5A Iout, High Switching Frequency
  • LM5576  -  75V Vin, 3A Iout, Selectable Switching Frequency, PowerWise
  • LM5576-Q1  -  75V Vin, 3A Iout, Selectable Switching Frequency, PowerWise


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.


  • 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)
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Special Features
Control Mode
Vref Accuracy (Typ) (%)
Operating Temperature Range (C)
Approx. Price (US$)
LM2576HV LM5005 LM5576 LM5576-Q1
1     1     1     1    
4     7     6     6    
60     75     75     75    
3.3     1.23     1.23     1.23    
37     70     70     70    
3     2.5     3     3    
Buck     Buck     Buck     Buck    
  500     500     500    
  3.5     4.2     4.2    
  3     1     1    
  99     95     95    
  Adjustable     Adjustable     Adjustable    
Internal     External     External     External    
Frequency Synchronization    
Voltage Mode     Current Mode     Current Mode     Current Mode    
  1.5     1.5     1.5    
Catalog     Catalog     Catalog     Automotive    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
20HTSSOP     20HTSSOP     20HTSSOP    
2.30 | 1ku     1.75 | 1ku     2.60 | 1ku     3.15 | 1ku    

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