Inicio Gestión de la energía Convertidores de CA/CC y CC/CC (FET integrado)
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Gestión de la energía
Convertidores de CA/CC y CC/CC (FET integrado)

LM2574

ACTIVO

Convertidor reductor SIMPLE SWITCHER® de 8 V a 40 V y 500 mA con 4 componentes externos

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LM2574

ACTIVO
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Detalles del producto

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) 40 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) 40 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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Documentación técnica

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* Data sheet LM2574/LM2574HV SIMPLE SWITCHER® 0.5-A Step-Down Voltage Regulator datasheet (Rev. F) 17 abr 2020
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
Technical article Quantifying the value of wide VIN PDF | HTML 15 jun 2016
Technical article How to increase system reliability and simplify design using DC/DC converters PDF | HTML 13 jun 2016
Technical article DC/DC converter datasheets – System losses demystified PDF | HTML 25 abr 2016
Technical article The importance of accurate switching frequency and current limit when selecting bu PDF | HTML 19 abr 2016
Technical article DC/DC converter datasheets – System efficiency demystified PDF | HTML 18 abr 2016
Technical article Advantages of leaded packages in robust industrial designs PDF | HTML 08 mar 2016
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 abr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 abr 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 abr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23 abr 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23 abr 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23 abr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 abr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 abr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 abr 2013
Application note Buck Converters Provide a Battery Charger and System Power 21 mar 2007
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

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Soporte de software

SWITCHERSMADESIMPLE-SW — Switchers Made Simple® Software

Note: The Switchers Made Simple design computations have been incorporated into Texas Instruments' award winning WEBENCH Power Designer Online Design Tool. Please use TI's WEBENCH Power Designer online tools for new designs. The WEBENCH Design Tool also includes:

  • Visual design optimization for (...)
Productos y hardware compatibles

Productos y hardware compatibles

Productos
Convertidores de CA/CC y CC/CC (FET integrado)
LM2574 — Convertidor reductor SIMPLE SWITCHER® de 8 V a 40 V y 500 mA con 4 componentes externos LM2575 — Regulador de conmutación de tensión ajustable reductor simple de 1 A con activación de salida LM2576 — Regulador reductor de recuento de componentes bajo de 3 A y 40 V SIMPLE SWITCHER® LM2577 — Regulador elevador de recuento de componentes bajo de 3 A y 3.5 V a 40 V
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Modelo de simulación

LM2574 PSpice Transient Model

SNVMB20.ZIP (41 KB) - PSpice Model
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Modelo de simulación

LM2574 Unencrypted PSpice Transient Model

SNVMB19.ZIP (2 KB) - PSpice Model
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Encapsulado Pines Símbolos CAD, huellas y modelos 3D
PDIP (P) 8 Ultra Librarian
SOIC (NPA) 14 Ultra Librarian
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Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

Soporte y capacitación

Foros de TI E2E™ con asistencia técnica de los ingenieros de TI

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