LM2576 Adjustable 3A Step-Down Voltage Regulator

3,588 views

The LM2576-ADJ is a monolithic integrated circuit that provides all the active functions for a step-down (buck) switching regulator. This device features an output voltage that is adjustable from driving a 3A load with excellent line and load regulation. Requiring a minimum number of external components, this regulator is simple to use and includes internal frequency compensation and a fixed-frequency oscillator.

The LM2576-ADJ offers a high-efficiency replacement for popular three-terminal adjustable linear regulators. It substantially reduces the size of the heat sink, and in many cases, no heat sink is required. A standard of inductors is available from several different manufacturers optimized for use with the LM2576- ADJ. This feature greatly simplifies the design of switch-mode power supplies.

LM2576 Pinout

LM2576 Pin Configuration

Pin NoPin NameDescription
1VinInput Voltage Pin
2OUTOutput Pin
3GNDGND
4FBFeedback Pin
5ON’/OFFComplement ON/Off Pin

LM2576 Key Features

  • Adjustable output, reference voltage +2% max over
  • line and load conditions
  • Guaranteed 3A output current
  • Wide input voltage range, 4V to 40V
  • Wide output voltage range, 1.23V to 37V
  • Requires only 6 external components
  • 52 kHz fixed frequency internal oscillator
  • Low power standby mode, lo typically<200 A
  • Efficiency typically over 80%
  • Uses readily available standard inductors

Application

  • Simple high-efficiency step-down (buck) regulator
  • Efficient pre-regulator for linear regulators
  • On-card switching regulators
  • Positive to negative converter (lnverting Buck-Boost)
  • Isolated Flyback Converter using minimum number often external components

You can download this datasheet for LM2576 Adjustable 3A Step-Down Voltage Regulator from the link given below: