LM3674   
2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5 from the PowerWise® Family		 Click link to Download

Features
•600mA max load current
•Input voltage range from 2.7V to 5.5V
•Available in fixed and adjustable output voltages ranging from 1.0V to 3.3V
• Operates from a single Li-Ion cell Battery
•Internal synchronous rectification for high efficiency
•Internal soft start
•0.01 µA typical shutdown current
• 2 MHz PWM fixed switching frequency (typ)
•SOT23-5 package
•Current overload protection and Thermal shutdown protection

Description

The LM3674 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600mA load current, over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions.

The device offers superior features and performance for mobile phones and similar portable systems. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ). Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typ).

The LM3674 is available in SOT23-5 in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ) allows use of only three tiny external surface-mount components, an inductor and two ceramic capacitors.

Applications
•Mobile phones
•PDAs
•MP3 players
•Portable instruments
•W-LAN
• Digital still cameras
•Portable Hard disk drives
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LM3674
 
2.70 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 5.50
V out 1.00 <=  V <= 3.30
I out    A <= 0.60
Ambient Temperature  °C <= 100


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Also Recommended
LM3670▲1 MHz Switching Frequency, 350mA Output Current, W/O PWM Mode
LM3671▲2 MHz Switching Frequency, 600mA Output Current, W/O PWM Mode



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                                              LM3674
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Also Recommended
LM3670▲1 MHz Switching Frequency, 350mA Output Current, W/O PWM Mode
LM3671▲2 MHz Switching Frequency, 600mA Output Current, W/O PWM Mode

Typical Application
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Block Diagram
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Typical Performance
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Paramaters / ValuesLM3674 LM3670 LM3671
Output Current600 mA 350 mA 600 mA
Input Min Voltage2.7 Volt 2.5 Volt 2.7 Volt
Input Max Voltage5.5 Volt 5.5 Volt 5.5 Volt
Output Min1.8, 1.1, 1.875, 1.2, 2.8, 1.5 Volt 1.8, 0.7, 1.875, 1.2, 3.3, 1.6, 1.5 Volt 1.8, 2.5, 1.1, 1.875, 1.2, 3.3, 1.375, 1.25, 2.8, 1.6, 1.5 Volt
Output Max1.8, 1.875, 1.2, 3.3, 2.8, 1.5 Volt 1.8, 2.5, 1.875, 1.2, 3.3, 1.6, 1.5 Volt 1.8, 2.5, 1.875, 1.2, 3.3, 1.375, 1.25, 2.8, 1.6, 1.5 Volt
Frequency Min2000 kHz 1000 kHz 2000 kHz
Frequency Max2000 kHz 1000 kHz 2000 kHz
Efficiency (peak)96 % 95 % 96 %
On/Off PinYes Yes Yes
Error FlagNo No No
SoftStartYes Yes Yes
Sync PinNo No No
InvertingNo No No
FlybackNo No No
RegTypeSwitching Regulator Switching Regulator Switching Regulator
Temperature Min-30 deg C -40 deg C -30 deg C
Temperature Max85 deg C 85 deg C 85 deg C
Adjustable OutputNo, Yes No, Yes No, Yes
Adj Switch FrequencyNo No No
PWM ModeVoltage with input feedforward Voltage with input feedfoward Voltage with input feedforward
TopologySynchronous Buck Synchronous Buck Synchronous Buck
Special FeaturesPin-selectable PWM/PFM modes, Iq=15uA, 100% duty cycle, internal compensation, ceramic-cap stable, only 3 external components Pin-selectable PWM/PFM modes, Iq=15uA, 100% duty cycle, internal compensation, ceramic-cap stable, only 3 external components Pin-selectable PWM/PFM modes, Iq=15uA, 100% duty cycle, internal compensation, ceramic-cap stable, only 3 external components
Step-DownYes Yes Yes
Multiple Output CapabilityNo No No
Output PowerUndefined Watt Undefined Watt Undefined Watt
Output Voltage1.8, Undefined, 1.875, 1.2, 2.8, 1.5 Volt 1.8, Undefined, 1.875, 3.3, 1.6, 1.5 Volt 1.8, Undefined, 2.5, 1.875, 1.2, 3.3, 1.375, 1.25, 2.8, 1.6, 1.5 Volt
Output RangeUndefined 0.7V to 3.3V 1.1V to 3.3V
Switching Frequency2000 kHz 1000 kHz 2000 kHz
Feedback VoltageUndefined Volt Undefined Volt Undefined Volt
Regulator FamilyUndefined Undefined Undefined
PowerWiseYes Yes Yes
Synchronous RectificationYes Yes Yes

Datasheet
TitleSizeDateOther
Language
LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-51102
Kbytes		13-Sep-06日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-1427: Application Note 1427 LM3674 Evaluation Board4966
Kbytes		14-Oct-08 中文


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Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3674MF-1.2/NOPB
LM3674MF-1.2

RoHS



SOT-23		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide1206
FUTUREWorldwide1100
NEWARKAmericas486
$0.95 each at 1K+ pcsreel
of
1000
LM3674MF-1.5/NOPB

RoHS



SOT-23		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1870
$0.95 each at 1K+ pcsreel
of
1000
LM3674MF-1.8/NOPB
LM3674MF-1.8

RoHS



SOT-23		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide2765
NEWARKAmericas445
$0.95 each at 1K+ pcsreel
of
1000
LM3674MF-1.875/NOPB

RoHS



SOT-23		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide2000
$0.95 each at 1K+ pcsreel
of
1000
LM3674MF-2.8/NOPB

RoHS



SOT-23		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide983
$0.95 each at 1K+ pcsreel
of
1000
LM3674MF-ADJ/NOPB
LM3674MF-ADJ

RoHS



SOT-23		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
AITGAsia Pacific1001
AVNET-EMWorldwide1950
DIGIKEYWorldwide2708
FARNELLEurope and Asia690
FUTUREWorldwide875
NEWARKAmericas880
RS COMPONENTSWorldwide885
$0.95 each at 1K+ pcsreel
of
1000
LM3674MFX-1.2/NOPB

RoHS



SOT-23		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.95 each at 1K+ pcsreel
of
3000
LM3674MFX-1.5/NOPB

RoHS



SOT-23		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.95 each at 1K+ pcsreel
of
3000
LM3674MFX-1.8/NOPB

RoHS



SOT-23		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.95 each at 1K+ pcsreel
of
3000
LM3674MFX-1.875/NOPB

RoHS



SOT-23		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.95 each at 1K+ pcsreel
of
3000
LM3674MFX-2.8/NOPB

RoHS



SOT-23		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.95 each at 1K+ pcsreel
of
3000
LM3674MFX-ADJ/NOPB

RoHS



SOT-23		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.95 each at 1K+ pcsreel
of
3000

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3674MF-1.5EV
2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5Full production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide10
$55.00 each1

The LM3674 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. The LM3674 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600mA load current, over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions. This device offers superior features and performance for mobile phones and similar portable systems. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ). Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 microA (typ).

Features:

  • 600mA max load current
  • Input voltage range from 2.7V to 5.5V
  • Available in fixed and adjustable output voltages ranging from 1.0V to 3.3V
  • Operates from a single Li-Ion cell Battery
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 microA typical shutdown current
  • 2 MHz PWM fixed switching frequency (typ)
  • SOT23-5 package
  • Current overload protection and Thermal shutdown protection

Applications

  • Mobile phones
  • PDAs
  • MP3 players
  • Portable instruments
  • W-LAN
  • Digital still Cameras
  • Portable Hard disk drives

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3674MF-1.8EV
2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5Full production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide95
$55.00 each1

The LM3674 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. The LM3674 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600mA load current, over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions. This device offers superior features and performance for mobile phones and similar portable systems. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ). Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 microA (typ).

Features:

  • 600mA max load current
  • Input voltage range from 2.7V to 5.5V
  • Available in fixed and adjustable output voltages ranging from 1.0V to 3.3V
  • Operates from a single Li-Ion cell Battery
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 microA typical shutdown current
  • 2 MHz PWM fixed switching frequency (typ)
  • SOT23-5 package
  • Current overload protection and Thermal shutdown protection

Applications

  • Mobile phones
  • PDAs
  • MP3 players
  • Portable instruments
  • W-LAN
  • Digital still Cameras
  • Portable Hard disk drives

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3674MF-ADJEV
2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5Full production


 
DistributorRegionQty
DIGIKEYWorldwide0
$55.00 each1
The LM3674 evaluation board is a working demonstration of a step down DC-DC converter. The application
note contains information about the evaluation board. The LM3674 step-down DC-DC converter is optimized
for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V.
It provides up to 600mA load current, over the entire input voltage range. There are several fixed output
voltages and adjustable output voltage versions. This device offers superior features and performance for
mobile phones and similar portable systems. During PWM mode, the device operates at a fixed-frequency
of 2 MHz (typ). Internal synchronous rectification provides high efficiency during PWM mode operation. In
shutdown mode, the device turns off and reduces battery consumption to 0.01 microA (typ).

LM3674 Features:
  • 600mA max load current
  • Input voltage range from 2.7V to 5.5V
  • Available in fixed and adjustable output voltages ranging from 1.0V to 3.3V
  • Operates from a single Li-Ion cell Battery
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 microA typical shutdown current
  • 2 MHz PWM fixed switching frequency (typ)
  • SOT23-5 package
  • Current overload protection and Thermal shutdown protection
LM3674 Applications
  • Mobile phones
  • PDAs
  • MP3 players
  • Portable instruments
  • W-LAN
  • Digital still Cameras
  • Portable Hard disk drives

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM3674MF-1.2/NOPB
LM3674MF-1.2
SOT-2351
1		260
260		RoHSDownloadN/A
SLRB
XTT
LM3674MF-1.5/NOPB
SOT-2351260RoHSDownloadN/A
SLSB
XTT
LM3674MF-1.8/NOPB
LM3674MF-1.8
SOT-2351
1		260
260		RoHSDownloadN/A
SLHB
XTT
LM3674MF-1.875/NOPB
SOT-2351260RoHSDownloadN/A
SNNB
XTT
LM3674MF-2.8/NOPB
SOT-2351260RoHSDownloadN/A
SLZB
XTT
LM3674MF-ADJ/NOPB
LM3674MF-ADJ
SOT-2351
1		260
260		RoHSDownloadN/A
SLTB
XTT
LM3674MFX-1.2/NOPB
SOT-2351260RoHSDownloadN/A
SLRB
XTT
LM3674MFX-1.5/NOPB
SOT-2351260RoHSDownloadN/A
SLSB
XTT
LM3674MFX-1.8/NOPB
SOT-2351260RoHSDownloadN/A
SLHB
XTT
LM3674MFX-1.875/NOPB
SOT-2351260RoHSDownloadN/A
SNNB
XTT
LM3674MFX-2.8/NOPB
SOT-2351260RoHSDownloadN/A
SLZB
XTT
LM3674MFX-ADJ/NOPB
SOT-2351260RoHSDownloadN/A
SLTB
XTT

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3674MF-1.2CMOS70184060010890004309006723
LM3674MF-1.5CMOS70184060010890004309006723
LM3674MF-1.8CMOS70184060010890004309006723
LM3674MF-1.875CMOS70184060010890004309006723
LM3674MF-2.8CMOS70184060010890004309006723
LM3674MF-ADJCMOS70184060010890004309006723
LM3674MFX-1.2CMOS70184060010890004309006723
LM3674MFX-1.5CMOS70184060010890004309006723
LM3674MFX-1.8CMOS70184060010890004309006723
LM3674MFX-1.875CMOS70184060010890004309006723
LM3674MFX-2.8CMOS70184060010890004309006723
LM3674MFX-ADJCMOS70184060010890004309006723

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.


[Information as of 21-Nov-2009]