LM2675 - SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Application Notes Knowledge Base

Features
•Efficiency up to 96%
•Available in SO-8, 8-pin DIP and LLP packages
•Computer Design Software LM267X Made Simple (version 6.0)
•Simple and easy to design with
•Requires only 5 external components
•Uses readily available standard inductors
•3.3V, 5.0V, 12V, and adjustable output versions
•Adjustable version output voltage range: 1.21V to 37V
•±1.5% max output voltage tolerance over line and load conditions
•Guaranteed 1A output load current
•0.25 DMOS Output Switch
•Wide input voltage range: 8V to 40V
•260 kHz fixed frequency internal oscillator
•TTL shutdown capability, low power standby mode
•Thermal shutdown and current limit protection

General Description

The LM2675 series of regulators are monolithic integrated circuits built with a LMDMOS process. More...


Applications

•Simple High Efficiency (>90%) Step-Down (Buck) Regulator
•Efficient Pre-Regulator for Linear Regulators
•Positive-to-Negative Converter
  Typical Application
click for larger image


ParametersValues
Output Current 1000 mA
Input Min Voltage 6.5, 15 Volt
Input Max Voltage 40 Volt
Output Min 3.3, 1.23, 12, 5 Volt
Output Max 3.3, 12, 37, 5 Volt
Frequency Min 260 kHz
Frequency Max 260 kHz
Efficiency (peak) 90, 94, 86 %
On/Off Pin Yes
Error Flag No
SoftStart No
Sync Pin No
Flyback No
RegType Switching Regulator
Temperature Min -40 deg C
Temperature Max 125 deg C
Adjustable Output Yes, No
Adj Switch Frequency No
PWM Mode Voltage with Vin Feedforward
Topology Buck
Special Features Internal Type 3 compensation, 1.5% output voltage accuracy, SIMPLE SWITCHER regulator
Step-Down Yes
Multiple Output Capability No
Output Power Undefined Watt
Output Voltage 3.3, 12, Undefined, 5 Volt
Output Range 12V, 1.23V to 37V, 3.3V, 5V
Switching Frequency 260 kHz
Regulator Family SIMPLE SWITCHER
Synchronous Rectification No


Typical Performance

*click for larger image


  WEBENCH Live Simulation!
WEBENCH Power Designer My Designs

LM2675
 
6.50 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 40.00
V out 1.21 <=  V <= 40.00
I out    A <= 1.00
Ambient Temperature  °C <= 100


What are WEBENCH® tools?

Also Recommended
LM22675▲Wider Input Voltage Range (4.5V To 42V), Fixed 500kHz
LM25575▲Fast-Transient Response, Higher Current (1.5A) And Higher Switching Frequency (Up To 1M
LM5575▲Wider Input Voltage Range (6 To 75V), Higher Current (1.5A) And Higher Switching Frequency (Up To 50
Additional Resources
Design Tools

Application Notes


See Layout Guidelines

Block Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2675 SIMPLE SWITCHER® Power Converter High Efficiency 1A Step-Down Voltage Regulator 920
Kbytes		 15-Jun-05 Download
LM2675 SIMPLE SWITCHER® Power Converter High Efficiency 1A Step-Down Voltage Regulator (Japanese)
 1079 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM2675-5.0EVALSIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage RegulatorFull productionN/A
 
Buy Now 		1+$30.001-
8 weeksN/A
LM2675LD-5.0LLP16NOPB3260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68reel
of
1000		NS
UZXYTT
S000FB
6 weeks2000
LM2675LD-ADJLLP16NOPB
STD		3
1		260
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68reel
of
1000		NS
UZXYTT
S000GB
6 weeks2000
LM2675LDX-ADJLLP16NOPB3260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.68reel
of
4500		NS
UZXYTT
S000GB
6 weeksN/A
LM2675M-12SOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68rail
of
95		NSZXTT
2675
M-12
12 weeks500
LM2675M-3.3SOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68rail
of
95		NSZXTT
2675
M3.3
12 weeks500
LM2675M-5.0SOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68rail
of
95		NSZXTT
2675
M5.0
6 weeks1000
LM2675M-ADJSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68rail
of
95		NSZXTT
2675
MADJ
8 weeks500
LM2675MX-12SOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$1.68reel
of
2500		NSZXTT
2675
M-12
6 weeks5000
LM2675MX-3.3SOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$1.68reel
of
2500		NSZXTT
2675
M3.3
10 weeks5000
LM2675MX-5.0SOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$1.68reel
of
2500		NSZXTT
2675
M5.0
6 weeks3000
LM2675MX-ADJSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$1.68reel
of
2500		NSZXTT
2675
MADJ
6 weeks3000
LM2675N-12MDIP8NOPB1NARoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68rail
of
40		NSUZXYTTE#
LM2675
N-12
8 weeks1000
LM2675N-3.3MDIP8NOPB1NARoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68rail
of
40		NSUZXYTTE#
LM2675
N-3.3
6 weeks500
LM2675N-5.0MDIP8NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68rail
of
40		NSUZXYTTE#
LM2675
N-5.0
16 weeks2000
LM2675N-ADJMDIP8NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.68rail
of
40		NSUZXYTTE#
LM2675
N-ADJ
6 weeks500

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2675LD-12
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2675LD-3.3
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2675LDX-12
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2675LDX-3.3
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2675LDX-5.0
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008
LM2675MX-ADJEP
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008

General Description

The LM2675 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation (Patent Nos. 5,382,918 and 5,514,947) 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 datasheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.

Other features include a guaranteed ±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 stand-by current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

To simplify the LM2675 buck regulator design procedure, there exists computer design software, LM267X Made Simple version 6.0.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2675LD-5.0LMDMOS0177100024700002700869244
LM2675LD-ADJLMDMOS0177100024700002700869244
LM2675LDX-ADJLMDMOS0177100024700002700869244
LM2675M-12LMDMOS0177100024700002700869244
LM2675M-3.3LMDMOS0177100024700002700869244
LM2675M-5.0LMDMOS0177100024700002700869244
LM2675M-ADJLMDMOS0177100024700002700869244
LM2675MX-12LMDMOS0177100024700002700869244
LM2675MX-3.3LMDMOS0177100024700002700869244
LM2675MX-5.0LMDMOS0177100024700002700869244
LM2675MX-ADJLMDMOS0177100024700002700869244
LM2675N-12LMDMOS0177100024700002700869244
LM2675N-3.3LMDMOS0177100024700002700869244
LM2675N-5.0LMDMOS0177100024700002700869244
LM2675N-ADJLMDMOS0177100024700002700869244

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Design Tools

TitleSize in Kbytes Date Click link below to Download    
SimpleSwitcher® DC-DC Converters Design Software     View    

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Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment 162
Kbytes		 1-Oct-02 Download
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment
 215 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1135: Application Note 1135 LM267X 3A, 5A Evaluation Boards 1208
Kbytes		 10-May-04 Download
AN-1157: Application Note 1157 Positive to Negative Buck‐Boost Converter Using LM267X SIMPLE SWITCHER® Regulators 189
Kbytes		 1-May-04 Download
AN-1157 (Japanese): Application Note 1157 Positive to Negative Buck‐Boost Converter Using LM267X SIMPLE SWITCHER® Regulators
 193 Kbytes   Download
AN-1157 (Chinese): Application Note 1157 Positive to Negative Buck‐Boost Converter Using LM267X SIMPLE SWITCHER® Regulators
 307 Kbytes  
AN-1120: Application Note 1120 LM2675-5.0EVAL 1 Amp Step-Down High-Efficiency SIMPLE SWITCHER Evaluation Board 44
Kbytes		 4-Oct-04 Download
AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines 229
Kbytes		 1-May-04 Download
AN-1229 (Japanese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
 304 Kbytes   Download
AN-1229 (Chinese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
 668 Kbytes  

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Nov-2009]