LM2577 Simple Switcher® Step-Up Adjustable Voltage Regulator

$6.49 ea

  • Part no.: 1922779
  • Manufacturer: Texas Instruments
  • Manufacturer no.: LM2577T-ADJ/NOPB
  • NCNR (Non-Cancelable, Non Returnable)
  • No datasheet available. Please review the tabs below for product specifications.
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LM2577 Simple Switcher® Step-Up Adjustable Voltage Regulator

The LM2577 is a monolithic integrated circuit that provides all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. This device is the adjustable output voltage version.

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

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


  • 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


  • Simple boost regulator
  • Flyback and forward regulators
  • Multiple-output regulator

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