LM2675

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SIMPLE SWITCHER® 6.5V to 40V, 1A Low Component Count Step-Down Regulator

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Data sheet

document-pdfAcrobat LM2675 SIMPLE SWITCHER® Power Converter High Efficiency 1-A Step-Down Voltage Regulator datasheet (Rev. F) PDF | HTML

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LM2675

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Data sheet

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Product details

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

1

Vin (min) (V)

6.5

Vin (max) (V)

40

Switching frequency (min) (kHz)

260

Switching frequency (max) (kHz)

260

Features

Enable, Over Current Protection

Control mode

Voltage mode

Vout (min) (V)

1.23

Vout (max) (V)

37

Iq (typ) (µA)

2500

Duty cycle (max) (%)

95

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

1

Vin (min) (V)

6.5

Vin (max) (V)

40

Switching frequency (min) (kHz)

260

Switching frequency (max) (kHz)

260

Features

Enable, Over Current Protection

Control mode

Voltage mode

Vout (min) (V)

1.23

Vout (max) (V)

37

Iq (typ) (µA)

2500

Duty cycle (max) (%)

95

PDIP (P)

8

92.5083 mm² 9.81 x 9.43

SOIC (D)

8

29.4 mm² 4.9 x 6

WSON (NHN)

16

25 mm² 5 x 5

Efficiency up to 96%
Available in 8-Pin SOIC, PDIP, and 16-Pin WSON
Package
Requires only 5 External Components
3.3-V, 5-V, 12-V, and Adjustable Output Versions
Adjustable Version Output Voltage Range: 1.21 V
to 37 V
±1.5% Maximum Output Voltage Tolerance Over
Line and Load Conditions
Ensured 1-A Output Load Current
Wide Input Voltage Range: 8 V to 40 V
260-kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low-Power Standby
Mode
Thermal Shutdown and Current Limit Protection

Efficiency up to 96%
Available in 8-Pin SOIC, PDIP, and 16-Pin WSON
Package
Requires only 5 External Components
3.3-V, 5-V, 12-V, and Adjustable Output Versions
Adjustable Version Output Voltage Range: 1.21 V
to 37 V
±1.5% Maximum Output Voltage Tolerance Over
Line and Load Conditions
Ensured 1-A Output Load Current
Wide Input Voltage Range: 8 V to 40 V
260-kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low-Power Standby
Mode
Thermal Shutdown and Current Limit Protection

The LM2675 series of regulators are monolithic integrated DC-DC converter circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation and a fixed frequency oscillator.

The LM2675 series operates at a switching frequency of 260 kHz, thus allowing smaller-sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency (>90%), the copper traces on the printed-circuit board are the only heat sinking needed.

A family of standard inductors for use with the LM2675 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the data sheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.

Other features include ±1.5%-tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50-µA standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

The LM2675 series of regulators are monolithic integrated DC-DC converter circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation and a fixed frequency oscillator.

The LM2675 series operates at a switching frequency of 260 kHz, thus allowing smaller-sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency (>90%), the copper traces on the printed-circuit board are the only heat sinking needed.

A family of standard inductors for use with the LM2675 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the data sheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.

Other features include ±1.5%-tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50-µA standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

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	Type	Title		Date
*	Data sheet	LM2675 SIMPLE SWITCHER® Power Converter High Efficiency 1-A Step-Down Voltage Regulator datasheet (Rev. F)	PDF \| HTML	29 Jun 2016
	Application note	Semiconductor and IC Package Thermal Metrics (Rev. D)	PDF \| HTML	25 Mar 2024
	Technical article	How to increase system reliability and simplify design using DC/DC converters	PDF \| HTML	13 Jun 2016
	Technical article	The importance of accurate switching frequency and current limit when selecting bu	PDF \| HTML	19 Apr 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-1187 Leadless Leadframe Package (LLP) (Rev. R)		07 May 2013
	Application note	AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C)		24 Apr 2013
	User guide	LM2675 5.0EVAL 1A Step-Down High-Efficiency SIMPLE SWITCHER Eval Brd (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 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

Design & development

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Evaluation board

LM2675-5.0EVAL — SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator Evaluation Module

Amp Step-Down High-Efficency SIMPLE SWITCHER Evaluation Board.

The LM2675 SIMPLE SWITCHER step-down regulator provides all the active functions for a step-down regulator capable of driving a 1A load. Switching frequency is internally set to 260 kHz, allowing smaller-sized filter components than (...)

User guide: PDF