LM2576-ADJ 3.0 A, 15 V, Step−Down Switching Regulator (SMD)

Sold By: Sanpra EnterprisesSKU: SN48

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The LM2576 regulators are monolithic integrated circuits ideally suited for the easy and convenient design of a step–down switching regulator (buck converter). The circuit can drive a 3.0 A load with excellent line and load regulation. The device is available in an adjustable output version. The regulator minimises the number of external components to simplify the power supply design.  Several different inductor manufacturers offer standard series of inductors optimised for use with the LM2576.

Since the LM2576 converter is a switch-mode power supply, its efficiency is significantly higher than the popular three-terminal linear regulators, especially with higher input voltages.

The LM2576 features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions and ±10% on the oscillator frequency (±2% over 0°C to 125°C). External shutdown is included, featuring 80 A (typical) standby current. The output switch includes cycle−by−cycle current limiting and thermal shutdown for full protection under fault conditions.

Pin Configuration

Pin Number

Pin Name




The voltage which has to be regulated is provided as input to this pin



The regulated output can be obtained through this pin



Connected to system ground



This pin is provided with the feedback voltage based on which the output is regulated   



Connect to the ground to activate the regulator or connect to Vcc to disable the regulator.


  • Adjustable Version Output Voltage Range, 1.23 to 35V ± 4% Maximum
  • Over Line and Load Conditions
  • Guaranteed 3.0 A Output Current
  • Wide Input Voltage Range
  • Requires Only 4 External Components
  • 52 kHz Fixed Frequency Internal Oscillator
  • TTL Shutdown Capability, Low Power Standby Mode
  • High Efficiency
  • Uses Readily Available Standard Inductors
  • Thermal Shutdown and Current Limit Protection


  • Simple High–Efficiency Step–Down (Buck) Regulator
  • Efficient Pre–Regulator for Linear Regulators
  • On–Card Switching Regulators
  • Positive to Negative Converter (Buck-Boost)
  • Negative Step-Up Converters
  • Power Supply for Battery Chargers


Model LM2576-ADJ
Brand IK-Semicon/UTC
Package TO-263
Maximum Supply Voltage 45V
Saturation Voltage 1.5V
Current Limit  4.2-6.9A
Efficiency 82%
Feedback Voltage 1.217 - 1.243V
Storage Temperature Range -65 to + 150°C
Oscillator Frequency 52kHz
Efficiency 88%
Type Through Hole
Dimensions 15.5mm x 10mm x 4.4mm

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