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LM2673  Product Folder

SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit
  

See Also:		   
LM2679 - 5A OUTPUT CURRENT
     LM2670 - HAS FREQUENCY SYNCHRONIZATION PIN
     LM2650 - SYNCHRONOUS RECTIFICATION FOR HIGHER EFFICIENCY
     LM2593HV - 4.5V TO 60V INPUT VOLTAGE, 2A OUTPUT CURRENT
Generic P/N 2673
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics		 Application
Notes

WEBENCH Live Simulation!
LM2673 Webench™ Custom
Design/Analyze/Build It
 
8.0 <=		 V in Lower
V		  
<=		 V in Upper
V		  
<= 40.0
V out 1.2 <= V <= 40.0
I out   A <= 3.00
Ambient Temperature °C <= 100

What is Webench?
  
Parametric Table
Temperature Min (deg C) -40 
Temperature Max (deg C) 125 
Multiple Output Capability No 
On/Off Pin No 
Error Flag No 
InputMin Voltage (Volt) 8, 15 
InputMax Voltage (Volt) 40 
Output Current (mA) 3000 
Output Voltage (Volt) 5, 12, 3.30 
Adjustable Output No, Yes 
Output Range 1.2V-37V 
Switching Frequency (Hz) 260000 
Adj Switch Frequency No 
Sync Pin No 
Efficiency (%) 88, 94, 86 
Flyback No 
Step-Up No 
Step-Down Yes 
RegType Switching Regulator 
-

Datasheet

TitleSize in KbytesDate
View Online
Download
Receive via Email
LM2673 SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit 451 Kbytes 15-Oct-03 View Online Download Receive via Email
LM2673 SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit (JAPANESE)
 250 Kbytes   View Online Download Receive via Email

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

Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM2673-5.0EVALevaluation boardFull productionN/AN/A 
Buy Now 		1+$20.001-
N/A0
LM2673LD-12LLP14StatusLifetime buyN/AN/A 
Buy Now		1K+$1.98reel
of
250		NS
UZXYTT
S0000AB
13-15 weeks50000
LM2673LD-3.3LLP14StatusLifetime buyN/AN/A 
Buy Now 		1K+$1.98reel
of
250		NS
UZXYTT
S00008B
13-15 weeks50000
LM2673LD-5.0LLP14StatusLifetime buyN/AN/A 
Buy Now		1K+$1.98reel
of
250		NS
UZXYTT
S00009B
13-15 weeks50000
LM2673LD-ADJLLP14StatusLifetime buyN/AN/A 
Buy Now 		1K+$1.98reel
of
250		NS
UZXYTT
S0000BB
13-15 weeks50000
LM2673LDX-12LLP14StatusLifetime buyN/AN/A 1K+$1.98reel
of
2500		NS
UZXYTT
S0000AB
13-15 weeks50000
LM2673LDX-3.3LLP14StatusLifetime buyN/AN/A 1K+$1.98reel
of
2500		NS
UZXYTT
S00008B
13-15 weeks50000
LM2673LDX-5.0LLP14StatusLifetime buyN/AN/A 1K+$1.98reel
of
2500		NS
UZXYTT
S00009B
13-15 weeks50000
LM2673LDX-ADJLLP14StatusLifetime buyN/AN/A 1K+$1.98reel
of
2500		NS
UZXYTT
S0000BB
13-15 weeks50000
LM2673SD-12LLP14StatusFull production N/AN/ASamples  reel
of
N/A		NS
UZXYTT
S0002SB
10-12 weeks20000
LM2673SD-3.3LLP14StatusFull production N/AN/ASamples  reel
of
N/A		NS
UZXYTT
S0002TB
10-12 weeks20000
LM2673SD-5.0LLP14StatusFull production N/AN/ASamples  reel
of
N/A		NS
UZXYTT
S0002UB
10-12 weeks25000
LM2673SD-ADJLLP14StatusFull production N/AN/ASamples  reel
of
N/A		NS
UZXYTT
S0002VB
13-15 weeks25000
LM2673SDX-12LLP14StatusFull production N/AN/A   reel
of
N/A		NS
UZXYTT
S0002SB
10-12 weeks20000
LM2673SDX-3.3LLP14StatusFull production N/AN/A   reel
of
N/A		NS
UZXYTT
S0002TB
10-12 weeks20000
LM2673SDX-5.0LLP14StatusFull production N/AN/A   reel
of
N/A		NS
UZXYTT
S0002UB
10-12 weeks25000
LM2673SDX-ADJLLP14StatusFull production N/AN/A   reel
of
N/A		NS
UZXYTT
S0002VB
13-15 weeks25000
LM2673T-12TO 2207StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.98rail
of
45		NSUZXYTT
LM2673
T-12
13-15 weeks75000
LM2673T-3.3TO 2207StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.98rail
of
45		NSUZXYTT
LM2673
T-3.3
13-15 weeks75000
LM2673T-5.0TO 2207StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.98rail
of
45		NSUZXYTT
LM2673
T-5.0
13-15 weeks75000
LM2673T-ADJTO 2207StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.98rail
of
45		NSUZXYTT
LM2673
T-ADJ
13-15 weeks75000
LM2673S-12TO 2637StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.98rail
of
45		NSUZXYTT
LM2673
S-12
10-12 weeks20000
LM2673S-3.3TO 2637StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.98rail
of
45		NSUZXYTT
LM2673
S-3.3
10-12 weeks20000
LM2673S-5.0TO 2637StatusFull productionN/AN/ASamples
Buy Now 		1K+$1.98rail
of
45		NSUZXYTT
LM2673
S-5.0
10-12 weeks25000
LM2673S-ADJTO 2637StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$1.98rail
of
45		NSUZXYTT
LM2673
S-ADJ
13-15 weeks25000
LM2673SX-12TO 2637StatusFull productionN/AN/A 
Buy Now		1K+$1.98reel
of
500		NSUZXYTT
LM2673
S-12
10-12 weeks20000
LM2673SX-3.3TO 2637StatusFull productionN/AN/A 1K+$1.98reel
of
500		NSUZXYTT
LM2673
S-3.3
10-12 weeks20000
LM2673SX-5.0TO 2637StatusFull productionN/AN/A 1K+$1.98reel
of
500		NSUZXYTT
LM2673
S-5.0
10-12 weeks25000
LM2673SX-ADJTO 2637StatusFull productionN/AN/A 
Buy Now		1K+$1.98reel
of
500		NSUZXYTT
LM2673
S-ADJ
13-15 weeks50000

General Description

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 3A 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® 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 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 softstart 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 guaranteed to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

Features

  • 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 2A to 5A.
  • 150 m DMOS output switch
  • 3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions
  • ±2%maximum output tolerance over full line and load conditions
  • Wide input voltage range: 8V to 40V
  • 260 KHz fixed frequency internal oscillator
  • Softstart capability
  • -40 to +125°C operating junction temperature range

Applications

  • Simple to design, high efficiency (>90%) step-down switching regulators
  • Efficient system pre-regulator for linear voltage regulators
  • Battery chargers

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM2673-5.0EVALLMDMOS09700004800006814846805
LM2673LD-12LMDMOS09700004800006814846805
LM2673LD-3.3LMDMOS09700004800006814846805
LM2673LD-5.0LMDMOS09700004800006814846805
LM2673LD-ADJLMDMOS09700004800006814846805
LM2673LDX-12LMDMOS09700004800006814846805
LM2673LDX-3.3LMDMOS09700004800006814846805
LM2673LDX-5.0LMDMOS09700004800006814846805
LM2673LDX-ADJLMDMOS09700004800006814846805
LM2673S-12LMDMOS09700004800006814846805
LM2673S-3.3LMDMOS09700004800006814846805
LM2673S-5.0LMDMOS09700004800006814846805
LM2673S-ADJLMDMOS09700004800006814846805
LM2673SD-12LMDMOS09700004800006814846805
LM2673SD-3.3LMDMOS09700004800006814846805
LM2673SD-5.0LMDMOS09700004800006814846805
LM2673SD-ADJLMDMOS09700004800006814846805
LM2673SDX-12LMDMOS09700004800006814846805
LM2673SDX-3.3LMDMOS09700004800006814846805
LM2673SDX-5.0LMDMOS09700004800006814846805
LM2673SDX-ADJLMDMOS09700004800006814846805
LM2673SX-12LMDMOS09700004800006814846805
LM2673SX-3.3LMDMOS09700004800006814846805
LM2673SX-5.0LMDMOS09700004800006814846805
LM2673SX-ADJLMDMOS09700004800006814846805
LM2673T-12LMDMOS09700004800006814846805
LM2673T-3.3LMDMOS09700004800006814846805
LM2673T-5.0LMDMOS09700004800006814846805
LM2673T-ADJLMDMOS09700004800006814846805

For more information on Reliablitity Metrics, please click here.


Application Notes

TitleSize in KbytesDate
View Online
Download
Receive via Email
AN-1135: Application Note 1135 LM267X 3A, 5A Evaluation Boards 1208 Kbytes 1-Oct-02 View Online Download Receive via Email
AN-1149: Application Note 1149 Layout Guidelines for Switching Power Supplies 113 Kbytes 26-Sep-02 View Online Download Receive via Email
AN-1157: Application Note 1157 Positive to Negative Buck-Boost Converter Using LM267X SIMPLE SWITCHER® Regulators 189 Kbytes 1-Oct-02 View Online Download Receive via Email
AN-1187: Application Note 1187 Leadless Leadframe Package (LLP) 1463 Kbytes 26-Sep-03 View Online Download Receive via Email
Application Note 1187 Leadless Leadframe Package (LLP) (JAPANESE)
 5326 Kbytes   View Online Download Receive via Email
AN-1197: Application Note 1197 Selecting Inductors for Buck Converters 371 Kbytes 1-Oct-02 View Online Download Receive via Email
AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines 229 Kbytes 1-Oct-02 View Online Download Receive via Email
AN-1246: Application Note 1246 Stresses in Wide Input DC-DC Converters 272 Kbytes 26-Sep-02 View Online Download Receive via Email
AN-556: Application Note 556 Introduction to Power Supplies 159 Kbytes 25-Sep-02 View Online Download Receive via Email

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

[Information as of 15-Jan-2004]

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