LM2678

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

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Datenblatt

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

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LM2678

AKTIV

Datenblatt

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Produktdetails

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

5

Vin (min) (V)

8

Vin (max) (V)

40

Switching frequency (min) (kHz)

260

Switching frequency (max) (kHz)

260

Features

Frequency synchronization, Over Current Protection

Control mode

Voltage mode

Vout (min) (V)

1.23

Vout (max) (V)

37

Iq (typ) (µA)

4200

Duty cycle (max) (%)

91

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

5

Vin (min) (V)

8

Vin (max) (V)

40

Switching frequency (min) (kHz)

260

Switching frequency (max) (kHz)

260

Features

Frequency synchronization, Over Current Protection

Control mode

Voltage mode

Vout (min) (V)

1.23

Vout (max) (V)

37

Iq (typ) (µA)

4200

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
120-mΩ DMOS Output Switch
3.3-V, 5-V, and 12-V Fixed Output and Adjustable (1.2 V to 37 V) Versions
50-µA Standby Current When Switched OFF
±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
–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
120-mΩ DMOS Output Switch
3.3-V, 5-V, and 12-V Fixed Output and Adjustable (1.2 V to 37 V) Versions
50-µA Standby Current When Switched OFF
±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
–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 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 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/OFF control input that can power down the regulator to a low 50-µA quiescent current standby condition. The output voltage is ensured 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 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 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/OFF control input that can power down the regulator to a low 50-µA quiescent current standby condition. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

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	Typ	Titel		Datum
*	Data sheet	LM2678 SIMPLE SWITCHER High Efficiency 5-A Step-Down Voltage Regulator datasheet (Rev. K)	PDF \| HTML	13 Jan 2017
	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
	EVM User's guide	AN-1135 LM267X 3A, 5A Evaluation Boards (Rev. D)		24 Apr 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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