LM2575: Buck Regulator, Switching, Adjustable Output Voltage, 1.0 A

The LM2575 series of Buck Switching 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 loadwith excellent line and load regulation. These devices are available in fixedoutput voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version. This Buck Switching Regulator is 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 0C to 125C). External shutdown is included, featuring 80 uA typical standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Features
  • 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
Applications
  • 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
Package Drawings (3)
Document TitleDocument ID/SizeRevision
5 LEAD D2PAK936A-02 (35.0kB)D
TO-220 5 LEAD314D-04 (61.5kB)H
TO-220 5 LEAD OFFSET314B-05 (260.2kB)L
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
Buck Converter, Switching Regulator, Adjustable Output Voltage, 1.0 ALM2575/D (492.0kB)11
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
LM2575D2T-012GLast ShipmentsPb-free Halide freeD2PAK-5936A-021Tube50
LM2575D2T-015GLast ShipmentsPb-free Halide freeD2PAK-5936A-021Tube50
LM2575D2T-12R4GActivePb-free Halide freeD2PAK-5936A-021Tape and Reel800$1.72
LM2575D2T-15R4GActivePb-free Halide freeD2PAK-5936A-021Tape and Reel800Contact BDTIC
LM2575D2T-3.3GLast ShipmentsPb-free Halide freeD2PAK-5936A-021Tube50
LM2575D2T-3.3R4GActivePb-free Halide freeD2PAK-5936A-021Tape and Reel800$1.72
LM2575D2T-5GActivePb-free Halide freeD2PAK-5936A-021Tube50$1.72
LM2575D2T-5R4GActivePb-free Halide freeD2PAK-5936A-021Tape and Reel800$1.72
LM2575D2T-ADJGActivePb-free Halide freeD2PAK-5936A-021Tube50$1.72
LM2575D2T-ADJR4GActivePb-free Halide freeD2PAK-5936A-021Tape and Reel800$1.72
LM2575T-12GActivePb-free Halide freeTO-220-5314D-04NATube50$1.5333
LM2575T-15GActivePb-free Halide freeTO-220-5314D-04NATube50Contact BDTIC
LM2575T-3.3GActivePb-free Halide freeTO-220-5314D-04NATube50Contact BDTIC
LM2575T-5GActivePb-free Halide freeTO-220-5314D-04NATube50$1.5333
LM2575T-ADJGActivePb-free Halide freeTO-220-5314D-04NATube50$1.5333
LM2575TV-005GLast ShipmentsPb-free Halide freeTO-220-5314B-05NATube50
LM2575TV-012GActivePb-free Halide freeTO-220-5314B-05NATube50Contact BDTIC
LM2575TV-15GLast ShipmentsPb-free Halide freeTO-220-5314B-05NATube50
LM2575TV-3.3GActivePb-free Halide freeTO-220-5314B-05NATube50Contact BDTIC
LM2575TV-5GActivePb-free Halide freeTO-220-5314B-05NATube50$1.5333
LM2575TV-ADJGActivePb-free Halide freeTO-220-5314B-05NATube50$1.5333
Specifications
ProductTopologyControl ModeVCC Min (V)VCC Max (V)VO Typ (V)IO Typ (A)Efficiency (%)fSW Typ (kHz)
LM2575D2T-12R4GStep-DownVoltage Mode7401218552
LM2575D2T-15R4GStep-DownVoltage Mode7401518552
LM2575D2T-3.3R4GStep-DownVoltage Mode7403.318552
LM2575D2T-5GStep-DownVoltage Mode740518552
LM2575D2T-5R4GStep-DownVoltage Mode740518552
LM2575D2T-ADJGStep-DownVoltage Mode7401.23 to 3718552
LM2575D2T-ADJR4GStep-DownVoltage Mode7401.23 to 3718552
LM2575T-12GStep-DownVoltage Mode7401218552
LM2575T-15GStep-DownVoltage Mode7401518552
LM2575T-3.3GStep-DownVoltage Mode7403.318552
LM2575T-5GStep-DownVoltage Mode740518552
LM2575T-ADJGStep-DownVoltage Mode7401.23 to 3718552
LM2575TV-012GStep-DownVoltage Mode7401218552
LM2575TV-3.3GStep-DownVoltage Mode7403.318552
LM2575TV-5GStep-DownVoltage Mode740518552
LM2575TV-ADJGStep-DownVoltage Mode7401.23 to 3718552
Buck Converter, Switching Regulator, Adjustable Output Voltage, 1.0 A (492.0kB) NCV2575
5 LEAD D2PAK LM2931
TO-220 5 LEAD LM2931
TO-220 5 LEAD OFFSET LM2931