SIMPLE SWITCHER® 4.5V to 40V, 3A Low Component Count Step-Down Regulator - LM2596

LM2596 (ACTIVE)

SIMPLE SWITCHER® 4.5V to 40V, 3A Low Component Count Step-Down Regulator

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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 LM2673 LM43603 LMR14030
1     1     1     1     1    
4.5     4.5     8     3.5     4    
40     40     40     36     40    
3.3     3.3     1.23     1     1    
37     37     37     28     36    
3     3     3     3     3.5    
Buck     Buck     Buck     Buck     Buck
Inverting Buck-Boost    
173     173     260     2200     2500    
4.5       4.5       5.5    
5     5     4.2     0.027     0.04    
100       91     99     97    
None       Adjustable     Adjustable
Fixed    
Adjustable    
Internal     Internal     Internal     Internal     Internal    
Enable     Power Good     Enable     Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking    
Adjustable UVLO
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up    
SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER    
Voltage Mode     Voltage Mode     Voltage Mode     Current Mode     Current Mode    
4     4     2     1.8     2    
Catalog     Catalog     Catalog     Catalog     Catalog    
-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    
14VSON
7DDPAK/TO-263
7TO-220    
16HTSSOP     8SO PowerPAD    
1.80 | 1ku     2.05 | 1ku     1.85 | 1ku     1.85 | 1ku     1.68 | 1ku    

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WEBENCH® LM2596
    Min   Max   Range  
  Vin V 4.5 to 40.0V  
  Vout V 1.23 to 40.0V  
  Iout A ≤ 3A  
  Ambient Temp °C -40 to 125°C  
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