LM2678

AKTIV

Abwärtswandler (Buck) SIMPLE SWITCHER®, 8 bis 40 V, 5 A, mit hohem Wirkungsgrad

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Datenblatt

document-pdfAcrobat LM2678 SIMPLE SWITCHER Power Converter, High-Efficiency, 5A, Step-Down Voltage Regulator datasheet (Rev. L) (Englisch) PDF | HTML

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LM2678

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

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

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

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-220 (NDZ)

7

82.6008 mm² 10.16 x 8.13

TO-263 (KTW)

7

153.924 mm² 10.1 x 15.24

VSON (NHM)

14

30 mm² 6 x 5

Efficiency up to 92%
Simple and easy to design using off-the-shelf external components
120mΩ DMOS output switch
3.3V, 5V, and 12V fixed output and adjustable (1.2V to 37V) versions
50µA standby current when switched OFF
±2% maximum output tolerance over full line and load conditions
8V to 40V wide input voltage range
260kHz fixed frequency internal oscillator
−40 to 125°C operating junction temperature range
Create a custom design using the LM2678 with the WEBENCH Power Designer

Efficiency up to 92%
Simple and easy to design using off-the-shelf external components
120mΩ DMOS output switch
3.3V, 5V, and 12V fixed output and adjustable (1.2V to 37V) versions
50µA standby current when switched OFF
±2% maximum output tolerance over full line and load conditions
8V to 40V wide input voltage range
260kHz fixed frequency internal oscillator
−40 to 125°C operating junction temperature range
Create a custom design using the LM2678 with the WEBENCH Power Designer

The LM2678 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 5A 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 3.3V, 5V, and 12V and an adjustable output version.

The SIMPLE SWITCHER power converter concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2678 are available from several manufacturers to greatly simplify the design process.

The LM2678 series also has built-in thermal shutdown, current limiting, and an ON and OFF control input that can power down the regulator to a low 50µA quiescent current standby condition. The output voltage is specified to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

The LM2678 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 5A 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 3.3V, 5V, and 12V and an adjustable output version.

The SIMPLE SWITCHER power converter concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2678 are available from several manufacturers to greatly simplify the design process.

The LM2678 series also has built-in thermal shutdown, current limiting, and an ON and OFF control input that can power down the regulator to a low 50µA quiescent current standby condition. The output voltage is specified to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

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Technische Dokumentation

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Top-Dokumentation	Typ	Titel	Format-Optionen	Datum
*	Data sheet	LM2678 SIMPLE SWITCHER Power Converter, High-Efficiency, 5A, Step-Down Voltage Regulator datasheet (Rev. L)	PDF \| HTML	25 Jun 2025
	Application note	Semiconductor and IC Package Thermal Metrics (Rev. D)	PDF \| HTML	25 Mär 2024
	Technical article	Quantifying the value of wide VIN	PDF \| HTML	15 Jun 2016
	Technical article	DC/DC converter datasheets – System losses demystified	PDF \| HTML	25 Apr 2016
	Technical article	DC/DC converter datasheets – System efficiency demystified	PDF \| HTML	18 Apr 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-1187 Leadless Leadframe Package (LLP) (Rev. R)		07 Mai 2013
	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-1Positive-to-Negative Buck-Boost Converter Using LM267x SIMPLE SWITCHER (Rev. E)		23 Apr 2013
	Application note	AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)		23 Apr 2013
	Application note	Simple Techniques Minimize Cross-Coupling in Distributed Power Systems		21 Mär 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 Mai 2004

Design und Entwicklung

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