LM22673   
3A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit 		Click link to Download

Features

•Wide input voltage range: 4.5V to 42V
•Internally compensated voltage mode control
•Stable with low ESR ceramic capacitors
•120 mΩ N-channel MOSFET TO-263 THIN package
•100 mΩ N-channel MOSFET PSOP-8 package
•Output voltage options:
• -ADJ (outputs as low as 1.285V)
• -5.0 (output fixed to 5V)
•±1.5% feedback reference accuracy
•Switching frequency of 500kHz
•-40°C to 125°C operating junction temperature range
•Adjustable soft-start
•Adjustable current limit
•Integrated boot diode
•Fully Webench ® enabled
•Step-down and inverting buck-boost applications

Description

The LM22673 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 N-channel MOSFET. The series consists of a fixed 5V output and an adjustable version.

The SIMPLE SWITCHER ® concept provides for an easy to use complete design using a minimum number of external components and National’s Webench ® design tool. National’s Webench ® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in. The switching clock frequency is provided by an internal fixed frequency oscillator which operates at 500 kHz. The LM22673 series also has built in thermal shutdown and current limiting. The current limit threshold can be adjusted using an external resistor. An adjustable soft-start feature is provided by selecting an appropriate external soft-start capacitor.

Applications
•Industrial Control
•Telecom and Datacom Systems
•Embedded Systems
•Automotive Telematics and Body Electronics
•Conversions from Standard 24V, 12V and 5V Input Rails
WEBENCH Power Designer My Designs

LM22673
 
4.50 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 42.00
V out 1.28 <=  V <= 37.00
I out    A <= 3.00
Ambient Temperature  °C <= 100


What are WEBENCH® tools?

Also Recommended
LM22670▲Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
LM22671▲0.5A Version
LM22672▲1A Version
LM22676▲Features Precision Enable
LM22679▲5A Version
LM22680▲2A Version



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                                              LM22673
Drag-Select for Table Reset Graph
Also Recommended
LM22670▲Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
LM22671▲0.5A Version
LM22672▲1A Version
LM22676▲Features Precision Enable
LM22679▲5A Version
LM22680▲2A Version
Paramaters / ValuesLM22673 LM22670 LM22671 LM22672 LM22676 LM22679 LM22680
Output Current3000 mA 3000 mA 500 mA 1000 mA 3000 mA 5000 mA 2000 mA
Input Min Voltage4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt
Input Max Voltage42 Volt 42 Volt 42 Volt 42 Volt 42 Volt 42 Volt 42 Volt
Output Min1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt
Efficiency (peak)92 % 92 % 91 % 92 % 92 % 92 % 89 %
On/Off PinNo Yes Yes Yes Yes No Yes
Error FlagNo No No No No No No
SoftStartYes No Yes Yes No Yes Yes
Sync PinNo Yes Yes Yes No No Yes
InvertingYes Yes Yes Yes Yes Yes
FlybackNo No No No No No No
RegTypeSwitching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator
Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C
Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
Adjustable OutputYes Yes Yes Yes Yes Yes Yes
Adj Switch FrequencyNo Yes Yes Yes No No Yes
PWM ModeVoltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control
TopologyBuck Buck Buck Buck Buck Buck Buck
Special FeaturesAdjustable Current Limit 500 kHz Default Switching Frequency 500 kHz Default Switching Fequency 500 kHz Default Switching Frequency 500 kHz Switching Frequency Adjustable Current Limit
Step-DownYes Yes Yes Yes Yes Yes Yes
Multiple Output CapabilityNo No No No No No No
Switching Frequency500 kHz 500 kHz 500 kHz 500 kHz 500 kHz 500 kHz 500 kHz
Feedback Voltage1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt
Regulator FamilySIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER
AutomotiveNo No No No No No
PowerWiseNo No No No No No No
Synchronous RectificationNo No No No No No No
Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM22673MR-5.0/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide190
DIGIKEYWorldwide0
FUTUREWorldwide85
$1.98 each at 1K+ pcsrail
of
95
LM22673MR-ADJ/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide215
DIGIKEYWorldwide0
FUTUREWorldwide369
$1.98 each at 1K+ pcsrail
of
95
LM22673MRE-5.0/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide5250
DIGIKEYWorldwide1380
FUTUREWorldwide400
NEWARKAmericas194
$1.98 each at 1K+ pcsreel
of
250
LM22673MRE-ADJ/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide250
DIGIKEYWorldwide1044
FUTUREWorldwide300
NEWARKAmericas95
$1.98 each at 1K+ pcsreel
of
250
LM22673MRX-5.0/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.98 each at 1K+ pcsreel
of
2500
LM22673MRX-ADJ/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.98 each at 1K+ pcsreel
of
2500
LM22673TJ-5.0/NOPB

RoHS Status



TO-263 THIN		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide1000
DIGIKEYWorldwide0
$1.98 each at 1K+ pcsreel
of
1000
LM22673TJ-ADJ/NOPB

RoHS Status



TO-263 THIN		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide978
DIGIKEYWorldwide0
$1.98 each at 1K+ pcsreel
of
1000
LM22673TJE-5.0/NOPB

RoHS Status



TO-263 THIN		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide250
DIGIKEYWorldwide500
FUTUREWorldwide233
NEWARKAmericas120
$1.98 each at 1K+ pcsreel
of
250
LM22673TJE-ADJ/NOPB

RoHS Status



TO-263 THIN		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide250
DIGIKEYWorldwide682
FUTUREWorldwide250
NEWARKAmericas229
$1.98 each at 1K+ pcsreel
of
250

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM22673EVAL
Evaluation Board for LM22673, 3A Adjustable Output Voltage Evaluation Board Features: Adjustable Soft-Start, and Adjustable Switching FrequencyFull production
Lead Free (RoHS)

 
DistributorRegionQty
AVNET-EMWorldwide5
DIGIKEYWorldwide16
FUTUREWorldwide2
NATIONALWorldwide48
$24.00 each1

Description:

The LM22673 evaluation board is designed to demonstrate the capabilities of the LM22673 switching regulator. The LM22673 evaluation board is configured to provide an output voltage of 3.3V up to 3A load current with an input voltage range of 4.5V to 42V. Due to the low RDS(ON) of the integrated N-channel MOSFET and maximum duty-cycle limitations, the minimum input voltage of 4.5V will only provide a 3.3V output voltage for load currents up to 500 mA. For load currents higher than 500 mA, an input voltage of 5.5V or higher is required. The typical operating frequency is 500 kHz. The evaluation board is designed to operate at ambient temperatures up to 50 °C.

Features:

  • Input Range: 4.5V to 42V
  • Output Voltage: 3.3V
  • Output Current Range: 0A to 3A
  • Frequency of Operation: 500 kHz
  • Board Size: 1.5 X 1.5 inches
  • Package: PSOP-8

At low input voltages between 4.5V and 6V, a minimum load of approximately 5 mA may be required to reach a regulated 3.3V output voltage.To aid in the design and evaluation of DC/DC buck converter solutions based on the LM22673 switching regulator, the evaluation board can be re-configured for different output voltages.

Contents:


Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHS
Status		CAD SymbolsModelsPackage
Marking
Format
LM22673MR-5.0/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22673
5.0
LM22673MR-ADJ/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22673
ADJ
LM22673MRE-5.0/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22673
5.0
LM22673MRE-ADJ/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22673
ADJ
LM22673MRX-5.0/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22673
5.0
LM22673MRX-ADJ/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22673
ADJ
LM22673TJ-5.0/NOPB
TO-263 THIN71260DetailDownloadN/A
NSUZXYTTE#
LM22673
TJ-5.0
LM22673TJ-ADJ/NOPB
TO-263 THIN71260DetailDownloadN/A
NSUZXYTTE#
LM22673
TJ-ADJ
LM22673TJE-5.0/NOPB
TO-263 THIN71260DetailDownloadN/A
NSUZXYTTE#
LM22673
TJ-5.0
LM22673TJE-ADJ/NOPB
TO-263 THIN71260DetailDownloadN/A
NSUZXYTTE#
LM22673
TJ-ADJ

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Design Tools
TitleSizeDate
"Downloadable LM2267x, LM22680 Quick Start Simple Switcher Component Calculator"1413 Kbytes12-Jan-2009

CAD Symbols and Models
Download LM22673 CAD Symbols
 Models
N/A

WEBENCH Power Designer My Designs

LM22673
 
4.50 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 42.00
V out 1.28 <=  V <= 37.00
I out    A <= 3.00
Ambient Temperature  °C <= 100


What are WEBENCH® tools?

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM22673MR-5.0ABCD5053640016269843461661152
LM22673MR-ADJABCD5053640016269843461661152
LM22673MRE-5.0ABCD5053640016269843461661152
LM22673MRE-ADJABCD5053640016269843461661152
LM22673MRX-5.0ABCD5053640016269843461661152
LM22673MRX-ADJABCD5053640016269843461661152
LM22673TJ-5.0ABCD5053640016269843461661152
LM22673TJ-ADJABCD5053640016269843461661152
LM22673TJE-5.0ABCD5053640016269843461661152
LM22673TJE-ADJABCD5053640016269843461661152

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.


All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

[Information as of 9-Feb-2010]