LM2574HV

ACTIVE

SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator

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Product details

Parameters

Vin (Min) (V) 4 Vin (Max) (V) 60 Vout (Min) (V) 3.3 Vout (Max) (V) 37 Iout (Max) (A) 0.5 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 52 Switching frequency (Max) (kHz) 52 Features Enable, Over Current Protection Control mode Voltage Mode Duty cycle (Max) (%) 98 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (NPA) 14 93 mm² 8.9915 x 10.325 open-in-new Find other Buck converters (integrated switch)

Features

  • 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

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Description

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
* Datasheet LM2574/LM2574HV SIMPLE SWITCHER® 0.5-A Step-Down Voltage Regulator datasheet (Rev. F) Apr. 17, 2020
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical articles More components, more problems Jun. 13, 2016
Technical articles Have you been had? Check the stated vs. actual current limit Apr. 19, 2016
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles SIMPLE SWITCHER regulators deliver a powerful punch for years Mar. 08, 2016
Application notes Cap Drop Offline Supply for E-Meters Jun. 16, 2015
Application notes Cost-Effective Transformerless Offline Supply for Light Load Applications (Rev. A) Jun. 16, 2015
Application notes Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
Application notes AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application notes AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application notes AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr. 23, 2013
Application notes AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
Application notes AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) Apr. 23, 2013
Application notes AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application notes AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application notes AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application notes AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
Application notes Input and Output Capacitor Selection Sep. 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application notes AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION MODELS Download
SNVMB21.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMB22.ZIP (46 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
SOIC (NPA) 14 View options

Ordering & quality

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