LM2734 - Thin SOT23 1A Load Step-Down DC-DC Regulator
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Reference Designs Application Notes Knowledge Base

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

General Description


The LM2734 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6-pin Thin SOT23 package. More...


Applications


Local Point of Load Regulation
Core Power in HDDs
Set-Top Boxes
Battery Powered Devices
USB Powered Devices
DSL Modems
Notebook Computers
Automotive
  Typical Application
click for larger image


ParametersValues
Output Current 1000 mA
Input Min Voltage 3 Volt
Input Max Voltage 20 Volt
Output Min 0.8 Volt
Output Max 18 Volt
Frequency Min 1600, 550 kHz
Frequency Max 1600, 550 kHz
Efficiency (peak) 90, 94 %
On/Off Pin Yes
Error Flag No
SoftStart Yes
Sync Pin No
Inverting No
Flyback No
RegType Switching Regulator
Temperature Min -40 deg C
Temperature Max 125 deg C
Adjustable Output Yes
Adj Switch Frequency No
PWM Mode Current
Topology Buck
Special Features OVP, internal compensation, 30nA shutdown current, pulse-by-pulse current limit
Step-Down Yes
Multiple Output Capability No
Output Voltage Undefined Volt
Output Range 0.8V to 18V
Switching Frequency 1600, 550 kHz
Feedback Voltage Undefined Volt
Regulator Family Undefined
AEC Q-100 Automotive Grade 1
Automotive Yes
Synchronous Rectification No


Typical Performance


click for larger image


  WEBENCH Live Simulation!
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
LM26511.5A Synchronous Buck Regulator
LM273411.5A, 2MHz Fsw, Frequency Sync
LM2734Z3MHz Version
LM27381.5A Version
LM50101A 80V Switching Reg
Additional Resources
Online Seminars Design Tools

Application Notes


Block Diagram


click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2734 Thin SOT23 1A Load Step-Down DC-DC Regulator 486
Kbytes
15-Apr-09 Download
LM2734 Thin SOT23 1A Load Step-Down DC-DC Regulator (Japanese)
752 Kbytes   Download

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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
SP16160CH1RBKITHigh-IF Sub-sampling Receiver Subsystem Reference DesignPreliminaryN/A
 
Buy Now
 CALLN/A-
N/AN/A
LM2734X EVALThin SOT23 1A Load Step-Down DC-DC RegulatorFull productionN/A
 
Buy Now
1+$38.001-
8 weeksN/A
LM2734Y EVALThin SOT23 1A Load Step-Down DC-DC RegulatorFull productionN/A
 
Buy Now
1+$25.501-
8 weeksN/A
LM2734XQMKETSOT6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.78reel
of
250
SUKB
XTT
8 weeksN/A
LM2734YQMKETSOT6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.49reel
of
250
SVCB
XTT
6 weeksN/A
LM2734XMKTSOT6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.50reel
of
1000
SFDB
XTT
6 weeksN/A
LM2734XQMKTSOT6NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.78reel
of
1000
SUKB
XTT
8 weeksN/A
LM2734YQMKTSOT6NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.49reel
of
1000
SVCB
XTT
6 weeksN/A
LM2734YMKTSOT6NOPB
STD
1
1
260
260
RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.25reel
of
1000
SFEB
XTT
6 weeks2000
LM2734XQMKXTSOT6NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.78reel
of
3000
SUKB
XTT
6 weeksN/A
LM2734YQMKXTSOT6NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.49reel
of
3000
SVCB
XTT
6 weeksN/A
LM2734YMKXTSOT6NOPB
STD
1
1
260
260
RoHS Download Full productionN/A
 
Buy Now
1K+$1.25reel
of
3000
SFEB
XTT
6 weeks10000

Obsolete Versions

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

General 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.

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.


Design Tools


TitleSize in Kbytes Date Click link below to Download    
Article - Automotive Switching Regulators Get Input-Transient-Voltage Protection     View    
Article - Methods and Features of LED Drivers     View    

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

Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1350: Application Note 1350 LM2734 Evaluation Board 639
Kbytes
4-Feb-05 Download
AN-1822: Application Note 1822 LMH6733 High Definition Video Transmission Over CAT5 691
Kbytes
14-Jan-09 Download
AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865 1072
Kbytes
10-Jan-06 Download
AN-1408 (Chinese): Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP83865
697 Kbytes  

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More Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators 348
Kbytes
25-Jun-09 Download
AN-1280: Application Note 1280 LM2731/LM2733 Evaluation Board 55
Kbytes
18-Apr-03 Download
AN-1658: Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator 408
Kbytes
26-Jun-07 Download
AN-1658 (Japanese): Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator
620 Kbytes   Download
AN-1658 (Chinese): Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator
405 Kbytes  
AN-1837: Application Note 1837 LM2738 Evaluation Board 799
Kbytes
10-Apr-08 Download
AN-1418: Application Note 1418 LM2736 Evaluation Board 858
Kbytes
26-Oct-05 Download
AN-1418 (Chinese): Application Note 1418 LM2736 Evaluation Board
279 Kbytes  
AN-1929: Application Note 1929 LM27342 Demonstration Board 507
Kbytes
20-Nov-08 Download

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[Information as of 8-Nov-2009]