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 TPS54340 LM2675 TPS54360 TPS54260 TPS54240 TPS54560 TPS54540 TPS54160A LM2578A TPS54140A TPS54360-Q1 TPS54340-Q1
1     1     1     1     1     1     1     1     1     1     1     1     1    
2     4.5     6.5     4.5     3.5     3.5     4.5     4.5     3.5     2     3.5     4.5     4.5    
40     42     40     60     60     42     60     42     60     40     42     60     42    
1     0.8     1.23     0.8     0.8     0.8     0.8     0.8     0.8     1     0.8     0.8     0.8    
  41     37     58.8     58     39     58.8     41.1     58       39     58.8     41    
0.75     3.5     1     3.5     2.5     2.5     5     5     1.5     0.75     1.5     3.5     3.5    
Buck
Boost
Flyback
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck     Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Boost
Buck
Flyback
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
Buck
Inverting Buck-Boost    
  2500     260     2500     2500     2500     2500     2500     2500       2500     2500     2500    
  5.5     1.55     5.5     3.5     3.5     7.5     7.5     1.8       1.8     5.5     5.5    
  0.146     2.5     0.146     0.138     0.138     0.146     0.146     0.116       0.116     0.146     0.146    
  98     95     98     98     98     98     98     98       98     98     98    
  Fixed     Fixed     Fixed     Adjustable     Adjustable     Fixed     Fixed     Adjustable       Adjustable     Fixed     Fixed    
  External     Internal     External     External     External     External     External     External     Internal     External     External     External    
  Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable     Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
  Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Tracking
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
Enable
Frequency Synchronization
Light Load Efficiency
Adjustable UVLO    
    SIMPLE SWITCHER       SWIFT     SWIFT     SWIFT     SWIFT     SWIFT     SIMPLE SWITCHER     SWIFT        
  Current Mode     Voltage Mode     Current Mode     Current Mode     Current Mode     Current Mode       Current Mode     Voltage Mode     Current Mode     Current Mode     Current Mode    
  1     1.5     1     1     1     1     1     1       1     1     1    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Automotive     Automotive    
0 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     -40 to 125     -40 to 125     -40 to 125    
8PDIP
8SOIC    
8SO PowerPAD     16WSON
8PDIP
8SOIC    
8SO PowerPAD     10MSOP-PowerPAD
10VSON    
10MSOP-PowerPAD
10VSON    
8SO PowerPAD     8SO PowerPAD     10MSOP-PowerPAD
10VSON    
8PDIP
8SOIC    
10MSOP-PowerPAD
10VSON    
8SO PowerPAD     8SO PowerPAD    
0.78 | 1ku     1.68 | 1ku     1.60 | 1ku     2.10 | 1ku     1.86 | 1ku     1.49 | 1ku     2.30 | 1ku     1.95 | 1ku     1.58 | 1ku     1.42 | 1ku     1.26 | 1ku     2.75 | 1ku     2.20 | 1ku    

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