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LM2575HV

ACTIVE

SIMPLE SWITCHER 1A Step-Down Voltage Regulator

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Data sheet

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LM2575HV

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 1 Vin (min) (V) 4 Vin (max) (V) 60 Switching frequency (min) (kHz) 42 Switching frequency (max) (kHz) 63 Features Enable, Over Current Protection Control mode Voltage mode Vout (min) (V) 3.3 Vout (max) (V) 57 Iq (typ) (µA) 10000 Duty cycle (max) (%) 98
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 1 Vin (min) (V) 4 Vin (max) (V) 60 Switching frequency (min) (kHz) 42 Switching frequency (max) (kHz) 63 Features Enable, Over Current Protection Control mode Voltage mode Vout (min) (V) 3.3 Vout (max) (V) 57 Iq (typ) (µA) 10000 Duty cycle (max) (%) 98
PDIP (NBG) 16 189.051819 mm² 21.7551 x 8.69 SOIC (DW) 24 159.65 mm² 15.5 x 10.3 TO-220 (KC) 5 45.212 mm² 10.16 x 4.45 TO-220 (NDH) 5 86.0552 mm² 10.16 x 8.47 TO-263 (KTT) 5 154.8384 mm² 10.16 x 15.24
  • 3.3V, 5V, 12V, 15V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range,
    •  1.23V to 37V (57V for HV Version) ±4% Max Over
    •  Line and Load Conditions
  • Specified 1A Output Current
  • Wide Input Voltage Range, 40V up to 60V for HV Version
  • 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
  • P+ Product Enhancement Tested

All trademarks are the property of their respective owners.
  • 3.3V, 5V, 12V, 15V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range,
    •  1.23V to 37V (57V for HV Version) ±4% Max Over
    •  Line and Load Conditions
  • Specified 1A Output Current
  • Wide Input Voltage Range, 40V up to 60V for HV Version
  • 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
  • P+ Product Enhancement Tested

All trademarks are the property of their respective owners.

The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.

The LM2575 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required.

A standard series of inductors optimized for use with the LM2575 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a specified ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 μA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.

The LM2575 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required.

A standard series of inductors optimized for use with the LM2575 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a specified ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 μA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
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Technical documentation

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Type Title Date
* Data sheet LM1575/LM2575/LM2575HV SIMPLE SWITCHER 1A Step-Down Voltage Regulator datasheet (Rev. E) 03 Apr 2013
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Application note Switching regulator fundamentals (Rev. C) PDF | HTML 05 Feb 2019
Application note Cap Drop Offline Supply for E-Meters 16 Jun 2015
Application note Cost-Effective Transformerless Offline Supply for Light Load Applications (Rev. A) 16 Jun 2015
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12 Sep 2014
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 Apr 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 Apr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23 Apr 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23 Apr 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23 Apr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 Apr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
Application note Input and Output Capacitor Selection 19 Sep 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12 Jul 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) 03 May 2004

Design & development

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Simulation model

LM2575HV PSpice Transient Model

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Simulation model

LM2575HV Unencrypted PSpice Transient Model

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Package Pins CAD symbols, footprints & 3D models
PDIP (NBG) 16 Ultra Librarian
SOIC (DW) 24 Ultra Librarian
TO-220 (KC) 5 Ultra Librarian
TO-220 (NDH) 5 Ultra Librarian
TO-263 (KTT) 5 Ultra Librarian
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