SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator - LM2596

LM2596 (ACTIVE)

SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator

Recommended alternative parts

  • LM2599  -  LM2596 W/ Error Flag, Soft Start And Shutdown Pin
  • LM2650  -  3A Synchronous Step-Down Regulator
  • LM2670  -  Higher Switching Freq. W/ Freq. Synchronization And Enable Pin
  • LM2673  -  Higher Switching Freq. W/ Soft Start And Prog. Current Limit
  • LM2676  -  Higher Switching Frequency, Smaller Package
  • LM2678  -  Higher Current (5A) And Higher Switching Freq.

Description

The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 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 LM2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package.

A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a ensured ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 μA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions. † Patent Number 5,382,918.

Features

  • 3.3V, 5V, 12V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range, 1.2V to 37V ±4% Max Over Line and Load Conditions
  • Available in TO-220 and TO-263 Packages
  • Ensured 3A Output Load Current
  • Input Voltage Range Up to 40V
  • Requires Only 4 External Components
  • Excellent Line and Load Regulation Specifications
  • 150 kHz Fixed Frequency Internal Oscillator
  • TTL Shutdown Capability
  • Low Power Standby Mode, IQ Typically 80 μA
  • High Efficiency
  • Uses Readily Available Standard Inductors
  • Thermal Shutdown and Current Limit Protection

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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$)
LM2596 LM2599 LM2650 LM2670 LM2673 LM2676 LM2678
1     1     1     1     1     1     1    
4.5     4.5     4.5     6.5     8     8     8    
40     40     18     40     40     40     40    
3.3     3.3     1.5     1.23     1.23     1.23     1.23    
37     37     16     37     37     37     37    
3     3     3     3     3     3     5    
Buck     Buck     Buck     Buck     Buck     Buck     Buck    
  150       400     260     260     260    
      4.5     4.5     4.5     7    
  5       4.2     4.2     4.2     4.2    
      91     91     91     91    
      Fixed     Adjustable     Fixed     Fixed    
Internal     Internal       Internal     Internal     Internal     Internal    
  Power Good       Enable     Enable     Enable     Enable    
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    
      2     2     2     2    
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    
5DDPAK/TO-263
5TO-220    
7DDPAK/TO-263
7TO-220    
24SOIC     14VSON
7DDPAK/TO-263
7TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
1.80 | 1ku     2.05 | 1ku     3.45 | 1ku     1.85 | 1ku     1.85 | 1ku     1.80 | 1ku     2.20 | 1ku    

Related end equipment

  • Simple High-Efficiency Step-Down (Buck) Regulator
  • On-Card Switching Regulators
  • Positive to Negative Converter

Featured tools and software

WEBENCH® LM2596
    Min   Max   Range  
  Vin V    4.50 – 40.00V  
  Vout V    1.23 – 40.00V  
  Iout A    ≤ 3.00A  
  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
 
 
 
'U1 Rfb1 Rfb2 D1 L1 Cout Cin Cff '
 
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