Switching Regulator - LM3578A

LM3578A (ACTIVE)

Switching Regulator

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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 LM25575 LM25575-Q1 LM2578A LM2595 LM2598 LM2672 LM2675
1     1     1     1     1     1     1     1    
2     6     6     2     4.5     4.5     6.5     6.5    
40     42     42     40     40     40     40     40    
1     1.23     1.23     1     3.3     3.3     1.23     1.23    
  40     40       37     37     37     37    
0.75     1.5     1.5     0.75     1     1     0.5     1    
Buck
Boost
Flyback
Inverting Buck-Boost    
Buck     Buck     Boost
Buck
Flyback
Inverting Buck-Boost    
Buck     Buck     Buck     Buck    
  1000     1000           400     260    
  2.1     2.1           1.55     1.55    
  1     1           2.5     2.5    
  95     95           95     95    
  Adjustable     Adjustable           Adjustable     Fixed    
  External     External     Internal     Internal     Internal     Internal     Internal    
  Enable
Tracking    
Enable         Power Good     Enable     Enable    
  SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER    
    Current Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode    
  1.5     1.5           1.5     1.5    
Catalog     Catalog     Automotive     Catalog     Catalog     Catalog     Catalog     Catalog    
0 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
8PDIP
8SOIC    
16HTSSOP     16HTSSOP     8PDIP
8SOIC    
5DDPAK/TO-263
5TO-220    
7DDPAK/TO-263
7TO-220    
16WSON
8PDIP
8SOIC    
16WSON
8PDIP
8SOIC    
0.78 | 1ku     1.60 | 1ku     2.10 | 1ku     1.42 | 1ku     1.60 | 1ku     1.70 | 1ku     1.65 | 1ku     1.60 | 1ku    

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