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LM2734 -
Thin SOT23 1A Load Step-Down DC-DC Regulator
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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 |
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Typical Application
click for larger image
| Parameters | Values |
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| 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
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WEBENCH Live Simulation!
Also Recommended
Additional Resources
Online Seminars
Design Tools
Application Notes
Block Diagram
click for larger image
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
 |
| 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 |
|
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Package Availability, Models, Samples & Pricing
| Obsolete Part | Alternate Part or
Supplier | Source | Last 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) |
|
LM2734XMK | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2734XQMK | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2734XQMKE | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2734XQMKX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
|
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LM2734YMK | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2734YMKX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2734YQMK | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2734YQMKE | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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LM2734YQMKX | PVIP050 | 0 | 9960 | 0 | 0 | 855000 | 5 | 242608584
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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
| Title | Size in Kbytes |
Date |
|
|
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| Article - Automotive Switching Regulators Get Input-Transient-Voltage Protection |
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View |
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| Article - Methods and Features of LED Drivers |
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View |
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Reference Designs
Application Notes
| Title | Size in Kbytes |
Date |
|
| 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
| Title | Size in Kbytes |
Date |
|
| 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 |
|
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AN-1658 (Chinese): Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator
|
405 Kbytes |
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| 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 |
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| AN-1929: Application Note 1929 LM27342 Demonstration Board |
507
Kbytes |
20-Nov-08 |
Download |
[Information as of 8-Nov-2009]
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