LM2575 Adjustable Voltage Regulator

Model No: REG-00013

TK. 95.83

Availability: In stock


Category: Regulator

The LM2575 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step−down switching regulator (buck converter). All circuits of this series are capable of driving a 1.0 A load with excellent line and load regulation.These devices are available in fixed output voltages of 3.3 V, 5.0 V,12 V, 15 V, and an adjustable output version.These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2575 are offered by several different inductor manufacturers.Since the LM2575 converter is a switch−mode power supply, its efficiency is significantly higher in comparison with popular three−terminal linear regulators,especially with higher input voltages.In many cases, the power dissipated by the LM2575 regulator is so low, that no heatsink is required or its size could be reduced dramatically.The LM2575 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, as well as thermal shutdown for full protection under fault conditions.


  • 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range of 1.23 V to 37 V ±4% Maximum Over Line and Load Conditions
  • Guaranteed 1.0 A Output Current
  • Wide Input Voltage Range: 4.75 V to 40 V 
  •  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
  • Moisture Sensitivity Level (MSL) Equals 1
  • Pb−Free Packages are Available



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

  • Maximum Supply Voltage : 45 V
  • ON/OFF Pin Input Voltage:−0.3 V ≤ V ≤ +Vin V
  • Output Voltage to Ground (Steady−State) : −1.0 V
  • Power Dissipation:Internally Limited
  • Thermal Resistance, Junction−to−Ambient:65 °C/W
  • Thermal Resistance, Junction−to−Case : 5.0 °C/W
  • Thermal Resistance, Junction−to−Ambient: 70 °C/W
  • Thermal Resistance, Junction−to−Case : 5.0 °C/W
  • Storage Temperature Range : −65 to +150 °C

Question & Answer

Total 2 questions

Q: the datasheet of LM2575 requires a 330uH inductor to output 5volt. But neither i have a 330uh inductor nor ur inventory, so suggest me an alternative inductor that can be used Questioned by saadman672, 27-Jun-2014

You can try with something closer but honestly speaking, my personal experience says that such regulators often do not work unless we use the accurate value and material of inductor mentioned in the datasheet. Answered by A.R, 12-Jul-2014 11:15 AM

Q: is it a 5volt ersion of lm2577 or adjustable version? Questioned by saadman672, 21-Jul-2014

This is 75 not 77. 77 is here(http://www.techshopbd.com/product-categories/switching-mode/1274/lm2577-adjustable-techshop-bangladesh). Answered by A.R, 23-Jul-2014 03:46 AM

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