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LM2679

ACTIVO

Regulador de conmutación CC/CC reductor de 5 A y 8 V a 40 V SIMPLE SWITCHER® con límite de corriente

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Detalles del producto

Rating Catalog Topology Buck Iout (max) (A) 5 Vin (max) (V) 40 Vin (min) (V) 8 Vout (max) (V) 37 Vout (min) (V) 1.23 Features Adjustable current limit, Frequency synchronization, Over Current Protection Control mode Voltage mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0042 Duty cycle (max) (%) 91
Rating Catalog Topology Buck Iout (max) (A) 5 Vin (max) (V) 40 Vin (min) (V) 8 Vout (max) (V) 37 Vout (min) (V) 1.23 Features Adjustable current limit, Frequency synchronization, Over Current Protection Control mode Voltage mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0042 Duty cycle (max) (%) 91
TO-263 (KTW) 7 153.924 mm² (10.1 mm × 15.24 mm) VSON (NHM) 14 30 mm² (6 mm × 5 mm) TO-220 (NDZ) 7 82.6008 mm² (10.16 mm × 8.13 mm)
  • Efficiency Up to 92%
  • Simple and Easy to Design Using Off-The-Shelf
    External Components
  • Resistor Programmable Peak Current Limit Over a
    Range of 3 A to 7 A
  • 120-mΩ DMOS Output Switch
  • 3.3-V, 5-V, 12-V Fixed Output and Adjustable
    (1.2 V to 37 V) Versions
  • ±2% Maximum Output Tolerance Over Full Line
    and Load Conditions
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-kHz Fixed Frequency Internal Oscillator
  • Soft-Start Capability
  • –40 to 125°C Operating Junction Temperature
    Range
  • Efficiency Up to 92%
  • Simple and Easy to Design Using Off-The-Shelf
    External Components
  • Resistor Programmable Peak Current Limit Over a
    Range of 3 A to 7 A
  • 120-mΩ DMOS Output Switch
  • 3.3-V, 5-V, 12-V Fixed Output and Adjustable
    (1.2 V to 37 V) Versions
  • ±2% Maximum Output Tolerance Over Full Line
    and Load Conditions
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-kHz Fixed Frequency Internal Oscillator
  • Soft-Start Capability
  • –40 to 125°C Operating Junction Temperature
    Range

The LM2679 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 5-A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3 V, 5 V, and 12 V and an adjustable output version.

The SIMPLE SWITCHER® concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260 kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2679 are available from several manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input surge current at power on by adding a soft-start timing capacitor to gradually turn on the regulator. The LM2679 series also has built-in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is specified to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

The LM2679 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 5-A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3 V, 5 V, and 12 V and an adjustable output version.

The SIMPLE SWITCHER® concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260 kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2679 are available from several manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input surge current at power on by adding a soft-start timing capacitor to gradually turn on the regulator. The LM2679 series also has built-in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is specified to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LM2679 SIMPLE SWITCHER 5-A Step-Down Voltage Regulator With Adjustable Current Limit datasheet (Rev. O) PDF | HTML 29/06/2016
Nota sobre la aplicación Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25/03/2024
Artículo técnico Quantifying the value of wide VIN PDF | HTML 15/06/2016
Artículo técnico DC/DC converter datasheets – System losses demystified PDF | HTML 25/04/2016
Artículo técnico DC/DC converter datasheets – System efficiency demystified PDF | HTML 18/04/2016
Nota sobre la aplicación Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12/09/2014
Nota sobre la aplicación AN-1187 Leadless Leadframe Package (LLP) (Rev. R) 7/05/2013
Nota sobre la aplicación AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24/04/2013
Nota sobre la aplicación AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23/04/2013
Nota sobre la aplicación AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23/04/2013
Nota sobre la aplicación AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23/04/2013
Nota sobre la aplicación AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23/04/2013
Nota sobre la aplicación AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23/04/2013
Nota sobre la aplicación AN-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E) 23/04/2013
Nota sobre la aplicación AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23/04/2013
Nota sobre la aplicación AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23/04/2013
Nota sobre la aplicación AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23/04/2013
Nota sobre la aplicación Simple Techniques Minimize Cross-Coupling in Distributed Power Systems 21/03/2007
Nota sobre la aplicación Input and Output Capacitor Selection 19/09/2005
Más documentación SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12/07/2005
Nota sobre la aplicación AN-643 EMI/RFI Board Design (Rev. B) 3/05/2004

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.

Placa de evaluación

LM2679-5.0EVAL — Regulador de tensión reductor de 5 A SIMPLE SWITCHER® con módulo de evaluación de límite de corrient

Simple Switcher 5A Step-Down Voltage Regulator with Adjustable Current Limit

Guía del usuario: PDF
Productos y hardware compatibles
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Modelo de simulación

LM2679 PSpice Transient Model

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Modelo de simulación

LM2679 Unencrypted PSpice Transient Model

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Productos y hardware compatibles
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
TO-263 (KTW) 7 Ultra Librarian
VSON (NHM) 14 Ultra Librarian
TO-220 (NDZ) 7 Ultra Librarian

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