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LM2574HV

ACTIVE

SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator

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Data sheet

A newer version of this product is available

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LMR36506 ACTIVE 3-V to 65-V, 0.6-A ultra-small synchronous buck converter with 4 μA IQ Higher Fsw, better efficiency, lower EMI and lower IQ.
TPSM5601R5H ACTIVE 60-V input, 1-V to 16-V output, 1.5-A power module in enhanced HotRod™ QFN package Save board space, simplify design and speed time to market with an integrated-inductor power module.

LM2574HV

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 0.5 Vin (min) (V) 4 Vin (max) (V) 60 Switching frequency (min) (kHz) 52 Switching frequency (max) (kHz) 52 Features Enable, Over Current Protection Control mode Voltage mode Vout (min) (V) 3.3 Vout (max) (V) 37 Iq (typ) (µA) 5000 Duty cycle (max) (%) 98
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 0.5 Vin (min) (V) 4 Vin (max) (V) 60 Switching frequency (min) (kHz) 52 Switching frequency (max) (kHz) 52 Features Enable, Over Current Protection Control mode Voltage mode Vout (min) (V) 3.3 Vout (max) (V) 37 Iq (typ) (µA) 5000 Duty cycle (max) (%) 98
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (NPA) 14 92.8372375 mm² 8.9915 x 10.325
  • New product available: TPS560430, 36-V, 600-mA synchronous step-down converter
  • 3.3-V, 5-V, 12-V, 15-V, and adjustable output versions
  • Adjustable version output voltage range: 1.23 V to 37 V (57 V for HV version) ±4% maximum over line and load conditions
  • Specified 0.5-A output current
  • Wide input voltage range: 40 V, up to 60 V for HV Version
  • Requires only four 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
  • Create a custom design using the LM2574 with the WEBENCH® Power Designer
  • New product available: TPS560430, 36-V, 600-mA synchronous step-down converter
  • 3.3-V, 5-V, 12-V, 15-V, and adjustable output versions
  • Adjustable version output voltage range: 1.23 V to 37 V (57 V for HV version) ±4% maximum over line and load conditions
  • Specified 0.5-A output current
  • Wide input voltage range: 40 V, up to 60 V for HV Version
  • Requires only four 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
  • Create a custom design using the LM2574 with the WEBENCH® Power Designer

The LM2574xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, 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 LM2574xx series offers a high-efficiency replacement for popular three-terminal linear regulators. Because of its high efficiency, the copper traces on the printed-circuit board (PCB) are normally the only heat sinking needed.

A standard series of inductors optimized for use with the LM2574 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 TPS560430 is a newer generation buck converter, being functionally equivalent to LM2574. It offers reduced BOM cost, increased efficiency, and reduced solution size. See the Device Comparison Table to compare specifications. Start WEBENCH Design with TPS560430.

The LM2574xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, 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 LM2574xx series offers a high-efficiency replacement for popular three-terminal linear regulators. Because of its high efficiency, the copper traces on the printed-circuit board (PCB) are normally the only heat sinking needed.

A standard series of inductors optimized for use with the LM2574 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 TPS560430 is a newer generation buck converter, being functionally equivalent to LM2574. It offers reduced BOM cost, increased efficiency, and reduced solution size. See the Device Comparison Table to compare specifications. Start WEBENCH Design with TPS560430.
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Technical documentation

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Type Title Date
* Data sheet LM2574/LM2574HV SIMPLE SWITCHER® 0.5-A Step-Down Voltage Regulator datasheet (Rev. F) 17 Apr 2020
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Technical article How to increase system reliability and simplify design using DC/DC converters PDF | HTML 13 Jun 2016
Technical article The importance of accurate switching frequency and current limit when selecting bu PDF | HTML 19 Apr 2016
Technical article Advantages of leaded packages in robust industrial designs PDF | HTML 08 Mar 2016
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

LM2574HV PSpice Transient Model

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Simulation model

LM2574HV Unencrypted PSpice Transient Model

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PDIP (P) 8 Ultra Librarian
SOIC (NPA) 14 Ultra Librarian
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