SIMPLE SWITCHER® 4V to 40V, 3A Low Component Count Step-Down Regulator - LM2576

LM2576 (ACTIVE)

SIMPLE SWITCHER® 4V to 40V, 3A Low Component Count Step-Down Regulator

Recommended alternative parts

  • LM43603  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Synchronous 36V, 3A Regulator - Higher efficiency, Low Quiescent Current, Smaller Solution Size

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 LM2574 LM2574HV LM2575-N LM2575HV LM2576HV LM2578A LM2596 LM2599 LM2696
1     1     1     1     1     1     1     1     1     1    
4     4     4     4     4     4     2     4.5     4.5     4.5    
40     40     60     40     60     60     40     40     40     24    
3.3     3.3     3.3     3.3     3.3     3.3     1     3.3     3.3     1.254    
37     37     37     37     57     37     36     37     37     20    
3     0.5     0.5     1     1     3     0.75     3     3     3    
Buck     Buck     Buck     Buck     Buck     Buck     Boost
Buck    
Buck     Buck     Buck    
63     52     52     63     63     63     24     173     173      
5.8     1     1     2.2     2.2     5.8       4.5        
5     5     5     5     5     5       5     5     1    
98     98     98     98     98     98     90     100        
None     None     None     None     None     None     None     None        
Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal      
              Enable     Power Good     Power Good    
SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     Wide Vin     SIMPLE SWITCHER     SIMPLE SWITCHER      
Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode      
1     1     1     1     1     1     7     4     4      
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    
5DDPAK/TO-263
5TO-220    
14SOIC
8PDIP    
14SOIC
8PDIP    
16PDIP
24SOIC
5DDPAK/TO-263
5TO-220    
16PDIP
5DDPAK/TO-263
5TO-220
24SOIC    
5DDPAK/TO-263
5TO-220    
8PDIP
8SOIC    
5DDPAK/TO-263
5TO-220    
7DDPAK/TO-263
7TO-220    
16HTSSOP    
1.19 | 1ku     0.76 | 1ku     1.45 | 1ku     0.93 | 1ku     1.80 | 1ku     2.30 | 1ku     1.42 | 1ku     1.80 | 1ku     2.05 | 1ku     1.70 | 1ku    

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