SIMPLE SWITCHER® Step-Up Voltage Regulator - LM2577

LM2577 (ACTIVE)

SIMPLE SWITCHER® Step-Up Voltage Regulator

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Description

The LM1577/LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable.

Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Listed in this data sheet are a family of standard inductors and flyback transformers designed to work with these switching regulators.

Included on the chip is a 3.0A NPN switch and its associated protection circuitry, consisting of current and thermal limiting, and undervoltage lockout. Other features include a 52 kHz fixed-frequency oscillator that requires no external components, a soft start mode to reduce in-rush current during start-up, and current mode control for improved rejection of input voltage and output load transients.

Features

  • Requires Few External Components
  • NPN Output Switches 3.0A, can Stand off 65V
  • Wide Input Voltage Range: 3.5V to 40V
  • Current-mode Operation for Improved Transient Response, Line Regulation, and Current Limit
  • 52 kHz Internal Oscillator
  • Soft-start Function Reduces In-rush Current During Start-up
  • Output Switch Protected by Current Limit, Under-voltage Lockout, and Thermal Shutdown

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Parametrics Compare all products in Step-Up (Boost) Converter

 
Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Topology
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Undervoltage Lockout
Switch Current Limit (Typ) (A)
Brand
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM2577 LM2585 LM2586 LM2587 LM2588 LM3224 LM5000
1     1     1     1     1     1     1    
3.5     4     4     4     4     2.7     3.1    
40     40     40     40     40     7     40    
1.23     1.23     1.23     1.23     1.23       1.259    
15     60     60     60     60     20     75    
Boost
Flyback    
Boost
Flyback    
Boost
Flyback    
Boost
Flyback    
Boost
Flyback    
Boost     Boost
Flyback
Forward
SEPIC    
52     115     200     115     200       1300    
10     11     11     11     11     1.3     2.1    
  98     98     98     98       90    
            Fixed    
3     4     4     6.5     6.5     2.6     2    
  SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER        
    Enable
Frequency Synchronization    
  Enable
Frequency Synchronization    
  Enable    
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    
16PDIP
5DDPAK/TO-263
24SOIC
5TO-220    
5DDPAK/TO-263
5TO-220    
7DDPAK/TO-263
7TO-220    
5DDPAK/TO-263
5TO-220    
7DDPAK/TO-263
7TO-220    
8VSSOP     16TSSOP
16WSON    
2.65 | 1ku     3.00 | 1ku     3.10 | 1ku     3.95 | 1ku     4.25 | 1ku     1.05 | 1ku     1.80 | 1ku    

Related end equipment

  • Simple Boost Regulator
  • Flyback and Forward Regulators
  • Multiple-output Regulator

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