LM2673

ACTIVO

Convertidor reductor SIMPLE SWITCHER® de 8 V a 40 V, 3 A con límite de corriente ajustable

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Hoja de datos

document-pdfAcrobat LM2673 SIMPLE SWITCHER® 3-A Step-Down Voltage Regulator With Adjustable Current Limit datasheet (Rev. O) (Inglés) PDF | HTML

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Convertidor buck sincrónico SIMPLE SWITCHER® de 4.5 V a 36 V, 3 A, con IQ de 40 µA. New converter in SOT-23 package

LM2673

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Detalles del producto

Rating

Catalog

Topology

Buck

Iout (max) (A)

3

Vin (max) (V)

40

Vin (min) (V)

8

Vout (max) (V)

37

Vout (min) (V)

1.23

Features

Enable, Overcurrent 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)

3

Vin (max) (V)

40

Vin (min) (V)

8

Vout (max) (V)

37

Vout (min) (V)

1.23

Features

Enable, Overcurrent protection

Control mode

Voltage mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.0042

Duty cycle (max) (%)

91

VSON (NHM)

14

30 mm² (6 mm × 5 mm)

TO-220 (NDZ)

7

82.6008 mm² (10.16 mm × 8.13 mm)

TO-263 (KTW)

7

153.924 mm² (10.1 mm × 15.24 mm)

Efficiency Up to 94%
Simple and Easy to Design With (Using Off-The-
Shelf External Components)
Resistor Programmable Peak Current Limit Over a
Range of 2 A to 5 A
150-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 94%
Simple and Easy to Design With (Using Off-The-
Shelf External Components)
Resistor Programmable Peak Current Limit Over a
Range of 2 A to 5 A
150-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 LM2673 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 3-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 LM2673 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 LM2673 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 ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

The LM2673 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 3-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 LM2673 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 LM2673 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 ensured 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
*	Hoja de datos	LM2673 SIMPLE SWITCHER® 3-A Step-Down Voltage Regulator With Adjustable Current Limit datasheet (Rev. O)	PDF \| HTML	30/06/2016
	Nota sobre la aplicación	Semiconductor and IC Package Thermal Metrics (Rev. D)	PDF \| HTML	25/03/2024
	Artículo técnico	DC/DC converter datasheets - Calculate system losses	PDF \| HTML	2/05/2016
	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-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

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