Switching Regulator - LM3578A

LM3578A (ACTIVE)

Switching Regulator

Description

The LM2578A is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the buck, boost, and inverting configurations. The LM2578A features a unique comparator input stage which not only has separate pins for both the inverting and non-inverting inputs, but also provides an internal 1.0V reference to each input, thereby simplifying circuit design and p.c. board layout. The output can switch up to 750 mA and has output pins for its collector and emitter to promote design flexibility. An external current limit terminal may be referenced to either the ground or the Vin terminal, depending upon the application. In addition, the LM2578A has an on board oscillator, which sets the switching frequency with a single external capacitor from <1 Hz to 100 kHz (typical).

The LM2578A is an improved version of the LM2578, offering higher maximum ratings for the total supply voltage and output transistor emitter and collector voltages.

Features

  • Inverting and Non-Inverting Feedback Inputs
  • 1.0V Reference at Inputs
  • Operates from Supply Voltages of 2V to 40V
  • Output Current up to 750 mA, Saturation Less than 0.9V
  • Current Limit and Thermal Shut Down
  • Duty Cycle up to 90%

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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$)
LM3578A LM2675 TPS54331 TPS54231 LM2596 TPS54228 TPS54232 TPS54233 LM2575HV LM2575-N LM2575 TL2575-ADJ TPS5402
      1         1     1         1       1    
      3.5         3.5     3.5         4.75       3.5    
      28         28     28         40       28    
      0.8         0.8     0.8         1.23       0.8    
      25         25     25         37       26    
0.75     1     3     2     3     2     2     2     1     1     1     1     1.7    
      Buck         Buck     Buck         Buck       Buck    
      570         1000     300         52       1100    
      3.5         4.9     3.5         3.2       2.5    
  2.5     0.11     0.075       0.8     0.085     0.075       5     5     5     0.1    
  95     90     90       90     90     90         98     98     93    
      Adjustable         Adjustable     Adjustable             Adjustable    
  Internal     External     External     Internal     Not Needed     External     External     Internal     Internal     Internal       External    
      Enable
Light Load Efficiency
Adjustable UVLO    
    Enable
Light Load Efficiency
Adjustable UVLO    
Enable
Light Load Efficiency
Adjustable UVLO    
        Light Load Efficiency    
  SIMPLE SWITCHER         SIMPLE SWITCHER     SWIFT         SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER        
  Voltage Mode     Current Mode     Current Mode     Voltage Mode     D-CAP2     Current Mode     Current Mode     Voltage Mode     Voltage Mode     Voltage Mode       Current Mode    
      3.5         3.5     3.5             3    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
0 to 125     -40 to 125     -40 to 150     -40 to 150     -40 to 125     -40 to 85     -40 to 150     -40 to 150     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
8PDIP
8SOIC    
16WSON
8PDIP
8SOIC    
8SO PowerPAD
8SOIC    
8SOIC     5DDPAK/TO-263
5TO-220    
10VSON
8SO PowerPAD
8SOIC    
8SOIC     8SOIC     16PDIP
5DDPAK/TO-263
5TO-220
24SOIC    
16PDIP
24SOIC
5DDPAK/TO-263
5TO-220    
16PDIP     16PDIP
5DDPAK/TO-263
5TO-220    
8SOIC    
0.78 | 1ku     1.60 | 1ku     0.60 | 1ku     0.55 | 1ku     1.80 | 1ku     0.63 | 1ku     0.55 | 1ku     0.55 | 1ku     1.80 | 1ku     0.93 | 1ku     1.45 | 1ku     1.08 | 1ku     1.05 | 1ku    

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