LM2734Z - Thin SOT23 1A Load Step-Down DC-DC Regulator
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Application Notes Knowledge Base

Features
Thin SOT23-6 package, or 6 lead LLP package
3.0V to 20V input voltage range
0.8V to 18V output voltage range
1A output current
3MHz switching frequency
300mΩ NMOS switch
30nA shutdown current
0.8V, 2% internal voltage reference
Internal soft-start
Current-Mode, PWM operation
Thermal shutdown
LM2734ZQ is AEC-Q100 Grade 1 qualified and is manufactured on an Automotive Grade Flow

General Description


The LM2734Z regulator is a monolithic, high frequency, PWM step-down DC/DC converter assembled in a 6-pin Thin SOT23 and LLP non pull back package. More...


Applications


DSL Modems
Local Point of Load Regulation
Battery Powered Devices
USB Powered Devices
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 3000 kHz
Frequency Max 3000 kHz
Efficiency (peak) 88 %
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 3000 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


  Additional Resources
Application Notes


Block Diagram


click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2734Z/LM2734ZQ Thin SOT23 1A Load Step-Down DC-DC Regulator 452
Kbytes
13-Jun-08 Download

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


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
LM2734ZEVALThin SOT23 1A Load Step-Down DC-DC RegulatorFull productionN/A
 
Buy Now
1+$38.001-
8 weeksN/A
LM2734ZMKTSOT6NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now
1K+$1.75reel
of
1000
SFTB
XTT
6 weeks1000
LM2734ZMKXTSOT6NOPB1260RoHS N/A Full productionN/A
 
Buy Now
1K+$1.75reel
of
3000
SFTB
XTT
6 weeks15000
LM2734ZQSDELLP6NOPB3260RoHS N/A Full productionN/A
 
Buy Now
1K+$2.10reel
of
250
ZXYTT
L238B
6 weeksN/A
LM2734ZQSDLLP6NOPB3260RoHS N/A Full productionN/A
 
Buy Now
1K+$2.10reel
of
1000
ZXYTT
L238B
6 weeksN/A
LM2734ZSDLLP6NOPB3260RoHS N/A Full productionN/A
Samples
Buy Now
1K+$1.75reel
of
1000
ZXYTT
L163B
6 weeks2000
LM2734ZQSDXLLP6NOPB3260RoHS N/A Full productionN/A
 
Buy Now
1K+$2.10reel
of
4500
ZXYTT
L238B
6 weeksN/A
LM2734ZSDXLLP6NOPB3260RoHS N/A Full productionN/A
 
Buy Now
1K+$1.75reel
of
4500
ZXYTT
L163B
6 weeks40000

General Description


The LM2734Z regulator is a monolithic, high frequency, PWM step-down DC/DC converter assembled in a 6-pin Thin SOT23 and LLP non pull back 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 LM2734Z 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 3MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is very high, efficiencies up to 85% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LM2734Z 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)
LM2734ZMKPVIP05009960008550005242608584
LM2734ZMKXPVIP05009960008550005242608584
LM2734ZQSDPVIP05009960008550005242608584
LM2734ZQSDEPVIP05009960008550005242608584
LM2734ZQSDXPVIP05009960008550005242608584
LM2734ZSDPVIP05009960008550005242608584
LM2734ZSDXPVIP05009960008550005242608584

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.


More 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-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  
AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators 348
Kbytes
25-Jun-09 Download
AN-1822: Application Note 1822 LMH6733 High Definition Video Transmission Over CAT5 691
Kbytes
14-Jan-09 Download
AN-1929: Application Note 1929 LM27342 Demonstration Board 507
Kbytes
20-Nov-08 Download

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

[Information as of 7-Nov-2009]