LM2738   
550kHz/1.6MHz 1.5A Step-Down DC-DC Switching Regulator 		Click link to Download

Features
•Space Saving LLP-8 and eMSOP-8 package
•3.0V to 20V input voltage range
•0.8V to 18V output voltage range
•1.5A output current
•550kHz (LM2738Y) and 1.6MHz (LM2738X)
•switching frequencies
•250mΩ NMOS switch
•400nA shutdown current
•0.8V, 2% internal voltage reference
•Internal soft-start
•Current-Mode, PWM operation
•Thermal shutdown

Description

The LM2738 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in an 8-pin LLP or 8-pin eMSOP package. It provides all the active functions for local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

With a minimum of external components, the LM2738 is easy to use. The ability to drive 1.5A loads with an internal 250mΩ NMOS switch using state-of-the-art 0.5µm BiCMOS technology results in the best power density available. Switching frequency is internally set to 550kHz (LM2738Y) or 1.6MHz (LM2738X), 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 enable is included, featuring an ultra-low stand-by current of 400nA. The LM2738 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 in-rush current, cycle-by-cycle 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
Also Recommended
LM27341▲Higher Switching Frequency (2MHz) & Frequency Sync



MY BRIEFCASE                                     Remove all from My Briefcase 
Click any "Briefcase" icon to add an item

                                              LM2738
Drag-Select for Table Reset Graph
Also Recommended
LM27341▲Higher Switching Frequency (2MHz) & Frequency Sync

Typical Application
click for larger image


Block Diagram
click for larger image

Block Diagram


Typical Performance
click for larger image


Paramaters / ValuesLM2738 LM27341
Output Current1500 mA 1500 mA
Input Min Voltage3 Volt 3 Volt
Input Max Voltage20 Volt 20 Volt
Output Min0.8 Volt 1 Volt
Output Max18 Volt 18 Volt
Frequency Min364, 1280 kHz 1000 kHz
Frequency Max1920, 676 kHz 2350 kHz
Efficiency (peak)94.5, 92 % 93 %
On/Off PinYes Yes
Error FlagNo No
SoftStartYes Yes
Sync PinNo Yes
InvertingNo No
FlybackNo No
RegTypeSwitching Regulator Switching Regulator
Temperature Min-40 deg C -40 deg C
Temperature Max125 deg C 125 deg C
Adjustable OutputYes Yes
Adj Switch FrequencyNo Yes
PWM ModeCurrent Current
TopologyBuck Non-Synchronous Buck Regulator
Step-DownYes Yes
Multiple Output CapabilityNo No
Switching Frequency1600, 550 kHz 2000 kHz
Feedback Voltage0.8 Volt 1 Volt
Regulator FamilySIMPLE SWITCHER
Synchronous RectificationNo No

Datasheet
TitleSizeDateOther
Language
LM2738 550kHz/1.6MHz 1.5A Step-Down DC-DC Switching Regulator612
Kbytes		10-Apr-08 


Featured Application Notes
TitleSizeDateOther
Language
AN-1837: Application Note 1837 LM2738 Evaluation Board799
Kbytes		10-Apr-08 


More Application Notes
TitleSizeDateOther
Language
AN-1280: Application Note 1280 LM2731/LM2733 Evaluation Board55
Kbytes		18-Apr-03 
AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators348
Kbytes		25-Jun-09 
AN-1408: Application Note 1408 Designing Power Over Ethernet Using LM5070 and DP838651072
Kbytes		10-Jan-06 中文
AN-1658: Application Note 1658 LM2735 BOOST and SEPIC DC-DCRegulator408
Kbytes		26-Jun-07日本語
中文
AN-1350: Application Note 1350 LM2734 Evaluation Board639
Kbytes		4-Feb-05 
AN-1418: Application Note 1418 LM2736 Evaluation Board858
Kbytes		26-Oct-05 中文
AN-1822: Application Note 1822 LMH6733 High Definition Video Transmission Over CAT5691
Kbytes		14-Jan-09 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2738XMY/NOPB

RoHS



MINI SOIC EXP PAD		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1710
FUTUREWorldwide1100
RS COMPONENTSWorldwide255
$1.75 each at 1K+ pcsreel
of
1000
LM2738YMY/NOPB

RoHS



MINI SOIC EXP PAD		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1918
FUTUREWorldwide1100
NEWARKAmericas646
RS COMPONENTSWorldwide146
$1.49 each at 1K+ pcsreel
of
1000
LM2738XMYX/NOPB

RoHS



MINI SOIC EXP PAD		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.75 each at 1K+ pcsreel
of
3500
LM2738YMYX/NOPB

RoHS



MINI SOIC EXP PAD		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.49 each at 1K+ pcsreel
of
3500
LM2738XSD/NOPB

RoHS



LLP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide5000
DIGIKEYWorldwide1964
FUTUREWorldwide1100
NEWARKAmericas860
$1.75 each at 1K+ pcsreel
of
1000
LM2738YSD/NOPB

RoHS



LLP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide5000
DIGIKEYWorldwide1981
FUTUREWorldwide1100
NEWARKAmericas753
$1.49 each at 1K+ pcsreel
of
1000
LM2738XSDX/NOPB

RoHS



LLP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.75 each at 1K+ pcsreel
of
4500
LM2738YSDX/NOPB

RoHS



LLP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.49 each at 1K+ pcsreel
of
4500

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2738XSD-5
LM2738XSD
National Semiconductor
30 Nov 2009
LM2738XSDX-5
LM2738XSDX
National Semiconductor
30 Nov 2009

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2738XMYEVAL
Evaluation Board for the LM2738 1.6MHz 1.5A Step-Down DC-DC Switching Regulator in space saving eMSOP packageFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide11
$60.00 each1

General Description:

The LM2738 demo board is configured to convert 12V input to 3.3V output at 1.5A load current using the LM2738X 1.6MHz or the LM2738Y 550kHz step down DC-DC regulator. The tiny low profile eMSOP-8 and LLP-8 packages allows the demo board to be manufactured using just over one square inch of a 4-layer printed circuit board.

Contents:


Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2738XSDEVAL
Evaluation Board for the LM2738 1.6MHz 1.5A Step-Down DC-DC Switching Regulator in space saving LLP packageFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide19
$60.00 each1

Description:

The LM2738 demo board is configured to convert 12V input to 3.3V output at 1.5A load current using the LM2738X 1.6MHz or the LM2738Y 550kHz step down DC-DC regulator. The tiny low profile eMSOP-8 and LLP-8 packages allows the demo board to be manufactured using just over one square inch of a 4-layer printed circuit board.

Contents:


Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2738YMYEVAL
Evaluation Board for the LM2738 550kHz 1.5A Step-Down DC-DC Switching Regulator in space saving eMSOP packageFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide19
$60.00 each1

Description:

The LM2738 demo board is configured to convert 12V input to 3.3V output at 1.5A load current using the LM2738X 1.6MHz or the LM2738Y 550kHz step down DC-DC regulator. The tiny low profile eMSOP-8 and LLP-8 packages allows the demo board to be manufactured using just over one square inch of a 4-layer printed circuit board.

Contents:


Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2738YSDEVAL
Evaluation Board for the LM2738 550kHz 1.5A Step-Down DC-DC Switching Regulator in space saving LLP packageFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide23
$60.00 each1

Description:

The LM2738 demo board is configured to convert 12V input to 3.3V output at 1.5A load current using the LM2738X 1.6MHz or the LM2738Y 550kHz step down DC-DC regulator. The tiny low profile eMSOP-8 and LLP-8 packages allows the demo board to be manufactured using just over one square inch of a 4-layer printed circuit board.

Contents:


Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM2738XMY/NOPB
MINI SOIC EXP PAD81260RoHSN/AN/A
ZXTT
STDB
LM2738YMY/NOPB
MINI SOIC EXP PAD81260RoHSN/AN/A
ZXTT
SJBB
LM2738XMYX/NOPB
MINI SOIC EXP PAD81260RoHSN/AN/A
ZXTT
STDB
LM2738YMYX/NOPB
MINI SOIC EXP PAD81260RoHSN/AN/A
ZXTT
SJBB
LM2738XSD/NOPB
LLP83260RoHSN/AN/A
ZXYTT
L237B
LM2738YSD/NOPB
LLP83260RoHSN/AN/A
ZXYTT
L174B
LM2738XSDX/NOPB
LLP83260RoHSN/AN/A
ZXYTT
L237B
LM2738YSDX/NOPB
LLP83260RoHSN/AN/A
ZXYTT
L174B

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2738XMYPVIP05009960008550005242608584
LM2738XMYXPVIP05009960008550005242608584
LM2738XSDPVIP05009960008550005242608584
LM2738XSDXPVIP05009960008550005242608584
LM2738YMYPVIP05009960008550005242608584
LM2738YMYXPVIP05009960008550005242608584
LM2738YSDPVIP05009960008550005242608584
LM2738YSDXPVIP05009960008550005242608584

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.


Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2738XSD-5
LM2738XSD
National Semiconductor
30 Nov 2009
LM2738XSDX-5
LM2738XSDX
National Semiconductor
30 Nov 2009

[Information as of 21-Nov-2009]