SIMPLE SWITCHER® 3.5V to 40V, 3A Low Component Count Step-Up Regulator - LM2577

LM2577 (ACTIVE)

SIMPLE SWITCHER® 3.5V to 40V, 3A Low Component Count Step-Up Regulator

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 Boost Converter (Integrated Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Typ) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Performance Features
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LM2577 LM2585 LM2586 LM2587 LM2588
3.5     4     4     4     4    
40     40     40     40     40    
1.23     1.23     1.23     1.23     1.23    
15     60     60     60     60    
3     4     4     6.5     6.5    
1     1     1     1     1    
  85     75     85     75    
52     115     125     115     125    
10     11     11     11     11    
    Enable
Frequency Synch    
  Enable
Frequency Synch    
95     98     98     98     98    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Catalog     Catalog    
DDPAK/TO-263
TO-220    
DDPAK/TO-263
TO-220    
DDPAK/TO-263
TO-220    
DDPAK/TO-263
TO-220    
DDPAK/TO-263
TO-220    

Related end equipment

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

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