LM2734   
Thin SOT23 1A Load Step-Down DC-DC Regulator 		Click link to Download

Features
•Thin SOT23-6 package
•3.0V to 20V input voltage range
•0.8V to 18V output voltage range
•1A output current
•550kHz (LM2734Y) and 1.6MHz (LM2734X)
•switching frequencies
•300mΩ NMOS switch
•30nA shutdown current
•0.8V, 2% internal voltage reference
•Internal soft-start
•Current-Mode, PWM operation
•WEBENCH® ™ online design tool
•Thermal shutdown
•LM2734XQ/LM2734YQ are AEC-Q100 Grade 1 qualified and are manufactured on an Automotive Grade Flow

Description

The LM2734 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6-pin Thin SOT23 package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

With a minimum of external components and online design support through WEBENCH® ™, the LM2734 is easy to use. The ability to drive 1A loads with an internal 300mΩ NMOS switch using state-of-the-art 0.5µm BiCMOS technology results in the best power density available. The world class control circuitry allows for on-times as low as 13ns, thus supporting exceptionally high frequency conversion over the entire 3V to 20V input operating range down to the minimum output voltage of 0.8V. Switching frequency is internally set to 550kHz (LM2734Y) or 1.6MHz (LM2734X), allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LM2734 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection.

Applications
•Local Point of Load Regulation
•Core Power in HDDs
•Set-Top Boxes
•Battery Powered Devices
•USB Powered Devices
•DSL Modems
•Notebook Computers
•Automotive
WEBENCH Power Designer My Designs

LM2734X
 
3.00 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 20.00
V out 0.80 <=  V <= 18.00
I out    A <= 1.00
Ambient Temperature  °C <= 100


What are WEBENCH® tools?

Also Recommended
LM2651▲1.5A Synchronous Buck Regulator
LM27341▲1.5A, 2MHz Fsw, Frequency Sync
LM2734Z▲3MHz Version
LM2738▲1.5A Version
LM5010▲1A 80V Switching Reg



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                                              LM2734
Drag-Select for Table Reset Graph
Also Recommended
LM2651▲1.5A Synchronous Buck Regulator
LM27341▲1.5A, 2MHz Fsw, Frequency Sync
LM2734Z▲3MHz Version
LM2738▲1.5A Version
LM5010▲1A 80V Switching Reg

Typical Application
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Block Diagram
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Typical Performance
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Paramaters / ValuesLM2734 LM2651 LM27341 LM2734Z LM2738 LM5010
Output Current1000 mA 1500 mA 1500 mA 1000 mA 1500 mA 1000 mA
Input Min Voltage3 Volt 4 Volt 3 Volt 3 Volt 3 Volt 8 Volt
Input Max Voltage20 Volt 14 Volt 20 Volt 20 Volt 20 Volt 75 Volt
Output Min0.8 Volt 3.3, 1.24 Volt 1 Volt 0.8 Volt 0.8 Volt 2.5 Volt
Output Max18 Volt 3.3, 13 Volt 18 Volt 18 Volt 18 Volt 70 Volt
Frequency Min1600, 550 kHz 300 kHz 1000 kHz 3000 kHz 364, 1280 kHz 50 kHz
Frequency Max1600, 550 kHz 300 kHz 2350 kHz 3000 kHz 1920, 676 kHz 1000 kHz
Efficiency (peak)90, 94 % 97 % 93 % 88 % 94.5, 92 % 91 %
On/Off PinYes Yes Yes Yes Yes Yes
Error FlagNo No No No No No
SoftStartYes Yes Yes Yes Yes Yes
Sync PinNo No Yes No No No
InvertingNo No No No No Yes
FlybackNo No No No No No
RegTypeSwitching 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
Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
Adjustable OutputYes Yes, No Yes Yes Yes Yes
Adj Switch FrequencyNo No Yes No No Yes
PWM ModeCurrent Current Mode Control Current Current Current Constant on-time
TopologyBuck Synchronous Buck Non-Synchronous Buck Regulator Buck Buck Buck
Special FeaturesOVP, internal compensation, 30nA shutdown current, pulse-by-pulse current limit Max. Iq at shutdown is 20uA over full temp range, 7uA typical OVP, internal compensation, 70nA shutdown current, pulse-by-pulse current limit OVP, internal compensation, 30nA shutdown current, pulse-by-pulse current limit No compensation required, ultra-fast transient response
Step-DownYes Yes Yes Yes Yes Yes
Multiple Output CapabilityNo No No No No No
Output VoltageUndefined Volt 3.3 Volt Undefined Volt Undefined Volt
Output Range0.8V to 18V 1.24V to 13V 1.0 - 18V 0.8V to 18V 2.5V to 70V
Switching Frequency1600, 550 kHz 300 kHz 2000 kHz 3000 kHz 1600, 550 kHz 1000 kHz
Feedback VoltageUndefined Volt Undefined Volt 1 Volt Undefined Volt 0.8 Volt 2.5 Volt
Regulator FamilyUndefined Undefined Undefined SIMPLE SWITCHER Undefined
AEC Q-100 Automotive Grade1 Undefined 1 1
AutomotiveYes Yes Yes Undefined
Synchronous RectificationNo Yes No No No No

Datasheets
TitleSizeDateOther
Language
LM2734 Thin SOT23 1A Load Step-Down DC-DC Regulator486
Kbytes		15-Apr-09日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-1350: Application Note 1350 LM2734 Evaluation Board639
Kbytes		4-Feb-05 
AN-1822: Application Note 1822 LMH6733 High Definition Video Transmission Over CAT5691
Kbytes		14-Jan-09 
AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP838651072
Kbytes		10-Jan-06 中文


More Application Notes
TitleSizeDateOther
Language
AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators348
Kbytes		25-Jun-09 
AN-1280: Application Note 1280 LM2731/LM2733 Evaluation Board55
Kbytes		18-Apr-03 
AN-1658: Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator408
Kbytes		26-Jun-07日本語
中文
AN-1837: Application Note 1837 LM2738 Evaluation Board799
Kbytes		10-Apr-08 
AN-1418: Application Note 1418 LM2736 Evaluation Board858
Kbytes		26-Oct-05 中文
AN-1929: Application Note 1929 LM27342 Demonstration Board507
Kbytes		20-Nov-08 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2734XMK/NOPB

RoHS Status



TSOT		Full production
Lead Time: 20 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide2000
DIGIKEYWorldwide0
NEWARKAmericas333
$1.50 each at 1K+ pcsreel
of
1000
LM2734XQMK/NOPB

RoHS Status



TSOT		Full production
Lead Time: 22 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.78 each at 1K+ pcsreel
of
1000
LM2734XQMKE/NOPB

RoHS Status



TSOT		Full production
Lead Time: 22 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide317
$1.78 each at 1K+ pcsreel
of
250
LM2734XQMKX/NOPB

RoHS Status



TSOT		Full production
Lead Time: 22 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.78 each at 1K+ pcsreel
of
3000
LM2734YMK/NOPB
LM2734YMK

RoHS Status



TSOT		Full production
Lead Time: 20 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide1901
FARNELLEurope and Asia1772
FUTUREWorldwide1100
KEIKONGAsia Pacific1000
NEWARKAmericas802
RS COMPONENTSWorldwide350
$1.25 each at 1K+ pcsreel
of
1000
LM2734YMKX/NOPB
LM2734YMKX

RoHS Status



TSOT		Full production
Lead Time: 22 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.25 each at 1K+ pcsreel
of
3000
LM2734YQMK/NOPB

RoHS Status



TSOT		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.49 each at 1K+ pcsreel
of
1000
LM2734YQMKE/NOPB

RoHS Status



TSOT		Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide343
$1.49 each at 1K+ pcsreel
of
250
LM2734YQMKX/NOPB

RoHS Status



TSOT		Full production
Lead Time: 22 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.49 each at 1K+ pcsreel
of
3000

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2734XMFX
LM2734XMKX
NATIONAL SEMICONDUCTOR
01 Dec 2009

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
LM2734X EVAL
Thin SOT23 1A Load Step-Down DC-DC RegulatorFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide133
$38.00 each1

Description:

LM2734 Thin SOT-23 1A Load Step-Down DC-DC Regulator

Features:

  • Thin SOT-23-6 package
  • 3.0V to 20V input voltage range
  • 0.8V to 18V output voltage range
  • 1A output current
  • 550kHz (LM2734Y) and 1.6MHz (LM2736X) switching frequencies
  • 300m ohm NMOS switch
  • 30nA shutdown current
  • 0.8V, 2% internal voltage reference
  • Internal soft-start
  • Current-Mode, PWM operation
  • WEBENCH online design tool

Applications:

  • Local Point of Load Regulation
  • Core Power in HDDs
  • Set-Top Boxes
  • Battery Powered Devices
  • USB Powered Devices
  • DSL Modems
  • Notebook Computers

Contents:

  • A fully assembled LM2734X evaluation board
  • LM2734 datasheet
  • LM2734 eval board appnote

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2734Y EVAL
Thin SOT23 1A Load Step-Down DC-DC RegulatorFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide24
$25.50 each1

Description:

LM2734 Thin SOT-23 1A Load Step-Down DC-DC Regulator

Features:

  • Thin SOT-23-6 package
  • 3.0V to 20V input voltage range
  • 0.8V to 18V output voltage range
  • 1A output current
  • 550kHz (LM2734Y) and 1.6MHz (LM2736X) switching frequencies
  • 300m ohm NMOS switch
  • 30nA shutdown current
  • 0.8V, 2% internal voltage reference
  • Internal soft-start
  • Current-Mode, PWM operation
  • WEBENCH online design tool
Applications:
  • Local Point of Load Regulation
  • Core Power in HDDs
  • Set-Top Boxes
  • Battery Powered Devices
  • USB Powered Devices
  • DSL Modems
  • Notebook Computers

Contents:

  • A fully assembled LM2734Y evaluation board
  • LM2734 datasheet
  • LM2734 eval board appnote

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
SP16160CH1RBKIT
High-IF Sub-sampling Receiver Subsystem Reference DesignPreliminary
Lead Free (RoHS)

 
DistributorRegionQty
NATIONALUnited States1
$995.00 each1

Description:

The SP16160CH1RB demonstrates a high-IF sampling receiver subsystem that provides signal amplification, digitization and clocking as used in wireless infrastructure systems. The subsystem includes the ADC16DV160 analog-to-digital converter (ADC), LMH6517 Digitally-controlled Variable-Gain Amplifier (DVGA) and LMK04031B precision clock conditioner.

Contents::

  • SP16160CH1RB reference board (for documentation see: RD-179)
  • ADC14PIC PIC loader board
    • Used for programming the LMK04031B
  • WaveVision 5 installation CD
    • Contains most recent Beta version of WaveVision 5 software (v5.0.5.175) and patch to support SP16160CH1RB
    • This kit requires the Wavevsn Brd 5.1 which must be purchased separately
  • Users Guide
  • Performance Plots

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHS
Status		CAD SymbolsModelsPackage
Marking
Format
LM2734XMK/NOPB
TSOT61260DetailDownloadN/A
SFDB
XTT
LM2734XQMK/NOPB
TSOT61260DetailDownloadN/A
SUKB
XTT
LM2734XQMKE/NOPB
TSOT61260DetailDownloadN/A
SUKB
XTT
LM2734XQMKX/NOPB
TSOT61260DetailDownloadN/A
SUKB
XTT
LM2734YMK/NOPB
LM2734YMK
TSOT61
1		260
260		DetailDownloadN/A
SFEB
XTT
LM2734YMKX/NOPB
LM2734YMKX
TSOT61
1		260
260		DetailDownloadN/A
SFEB
XTT
LM2734YQMK/NOPB
TSOT61260DetailDownloadN/A
SVCB
XTT
LM2734YQMKE/NOPB
TSOT61260DetailDownloadN/A
SVCB
XTT
LM2734YQMKX/NOPB
TSOT61260DetailDownloadN/A
SVCB
XTT

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
Article - Automotive Switching Regulators Get Input-Transient-Voltage Protection  
Article - Methods and Features of LED Drivers  


Reference Design
RD-143 - Lowest Power 8-bit 3 GSPS Data Acquisition System
RD-179 - High-IF Sub-sampling Receiver Subsystem

CAD Symbols and Models
Download LM2734 CAD Symbols
 Models
N/A

WEBENCH Power Designer My Designs

LM2734X
 
3.00 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 20.00
V out 0.80 <=  V <= 18.00
I out    A <= 1.00
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)
LM2734XMKPVIP05009960008550005242608584
LM2734XQMKPVIP05009960008550005242608584
LM2734XQMKEPVIP05009960008550005242608584
LM2734XQMKXPVIP05009960008550005242608584
LM2734YMKPVIP05009960008550005242608584
LM2734YMKXPVIP05009960008550005242608584
LM2734YQMKPVIP05009960008550005242608584
LM2734YQMKEPVIP05009960008550005242608584
LM2734YQMKXPVIP05009960008550005242608584

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.

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2734XMFX
LM2734XMKX
NATIONAL SEMICONDUCTOR
01 Dec 2009

[Information as of 9-Feb-2010]