LM2623   
General Purpose, Gated Oscillator Based, DC/DC Boost Converter 		Click link to Download

Features
•Good Efficiency Over a Very Wide Load Range
•Very Low Output Voltage Ripple
•Small, Mini-SO-8 Package (Half the Footprint of Standard 8 pin SO Package)
•1.09 mm Package Height
•Up to 2 MHz Switching Frequency
•.8V to 14V Operating Voltage
•1.1V Start-up Voltage
•1.24V - 14V Adjustable Output Voltage
•Up to 2A Load Current at low Output Voltages
•0.17 Internal MOSFET
•Up to 90% Regulator Efficiency
•80 µA Typical Operating Current (into VDD pin of supply)
•<2.5µA Guaranteed Supply Current In Shutdown
•4mm x 4mm Thermally Enhanced LLP Package Option

Description

The LM2623 is a high efficiency, general purpose, step-up DC-DC switching regulator for battery-powered and low input voltage systems. It accepts an input voltage between .8 and 14 volts and converts it into a regulated output voltage between 1.24 and 14 volts. Efficiencies up to 90% are achievable with the LM2623.

In order to adapt to a number of applications, the LM2623 allows the designer to vary the output voltage, the operating frequency (300kHz to 2 MHz) and duty cycle (17% to 90%) to optimize the part's performance. The selected values can be fixed or can vary with battery voltage or input to output voltage ratio. The LM2623 uses a very simple, on/off regulation mode to produce good efficiency and stable operation over a wide operating range. It normally regulates by skipping switching cycles when it reaches the regulation limit (Pulse Frequency Modulation).

Note: Please read the "Non-Linear Effect" and "Choosing The Correct C3 Capacitor" sub-sections of the Design Procedure section of this data sheet, so that any challenges with designing with this part can be taken into account before a board design/layout is finalized.

For Alternative Solutions, See Also: LM2700, LM2622, LM2731, LM2733, and LM2621.

Applications
•Cameras, Pagers and Cell Phones
•PDAs,Palmtop Computers, GPS devices
•White LED Drive, TFT or Scanned LCDs
•Flash Memory Programming
•Hand-Held Instruments
•1, 2, 3 or 4 Cell Alkaline Systems
•1, 2 or 3 Cell Lithium-ion Systems
Also Recommended
LM2731▲40V/1A Internal Switch, SOT-23, PWM Boost Regulator
LM3224▲Higher Efficiency, Pin Selectable PWM Frequency Allowing Easy Filtering And Low Noise



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                                              LM2623
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Also Recommended
LM2731▲40V/1A Internal Switch, SOT-23, PWM Boost Regulator
LM3224▲Higher Efficiency, Pin Selectable PWM Frequency Allowing Easy Filtering And Low Noise

Typical Application
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Connection Diagram
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Typical Performance
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Paramaters / ValuesLM2623 LM2731 LM3224
Output Range1.24V to 14V 1.23V to 22V Vin to 20V
Switch Current1.2, 2.2 Amp 1.5 Amp 2.6 Amp
Input Min Voltage0.8 Volt 2.7 Volt 2.7 Volt
Input Max Voltage14 Volt 14 Volt 7 Volt
Frequency Max2000 kHz 600, 1600 kHz 1250 kHz
Output Min1.24 Volt 1.23 Volt
Output Max14 Volt 22 Volt 20 Volt
Efficiency (peak)90 % 90 % 90 %
Sync PinNo No No
Adj Switch FrequencyYes No Yes
Frequency Min300 kHz 600, 1600 kHz 615 kHz
On/Off PinYes Yes Yes
Error FlagNo No No
SoftStartNo Yes
Special FeaturesRatio-adaptive gated oscillator Pin-selected switching frequency, External compensation, Ceramic cap stable, Flat panel display power, High current LED driver
PWM ModeGated oscillator Current Current
TopologyBoost, Flyback Boost Boost
Step-UpYes Yes Yes
InvertingNo No No
FlybackYes No Yes
RegTypeSwitching Regulator Switching Regulator Switching Regulator
Adjustable OutputYes Yes Yes
Output PowerUndefined Watt
Temperature Min-40 deg C -40 deg C -40 deg C
Temperature Max85 deg C 125 deg C 125 deg C
PowerWiseNo No No

Datasheet
TitleSizeDateOther
Language
LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter596
Kbytes		12-Dec-05 


Featured Application Notes
TitleSizeDateOther
Language
AN-1274: Application Note 1274 LM2623 Evaluation Board636
Kbytes		21-Sep-05 中文
AN-1221: Application Note 1221 LM2623 Cookbook35
Kbytes		2-May-04日本語
AN-1258: Application Note 1258 National`s LM2623 Boost Converter - A Simple Supply64
Kbytes		2-May-04 


More Application Notes
TitleSizeDateOther
Language
AN-1250: Application Note 1250 Inductive Based Switching Regulator Circuits Provide High Efficiency White LED Drives81
Kbytes		26-Sep-02 
AN-1237: Application Note 1237 RSDS™ Flat Panel Display Design Guidelines Part 2141
Kbytes		14-May-03 
AN-1198: Application Note 1198 LM2622 Step-Up DC/DC Converter Evaluation Board110
Kbytes		3-Apr-07 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2623ALD/NOPB

RoHS



LLP		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1616
RS COMPONENTSWorldwide829
$1.09 each at 1K+ pcsreel
of
1000
LM2623LD/NOPB

RoHS



LLP		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1966
$0.87 each at 1K+ pcsreel
of
1000
LM2623LDX/NOPB

RoHS



LLP		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.87 each at 1K+ pcsreel
of
4500
LM2623AMM/NOPB
LM2623AMM

RoHS



MINI SOIC		Full production
Lead Time: 8 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide995
DIGIKEYWorldwide1366
FARNELLEurope and Asia2641
FUTUREWorldwide1100
NEWARKAmericas50
RS COMPONENTSWorldwide134
$1.09 each at 1K+ pcsreel
of
1000
LM2623MM/NOPB

RoHS



MINI SOIC		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide1767
FUTUREWorldwide215
NEWARKAmericas42
RS COMPONENTSWorldwide164
RSL MICROAsia Pacific5000
$0.87 each at 1K+ pcsreel
of
1000
LM2623AMMX/NOPB

RoHS



MINI SOIC		Full production
Lead Time: 16 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.09 each at 1K+ pcsreel
of
3500
LM2623MMX/NOPB

RoHS



MINI SOIC		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$0.87 each at 1K+ pcsreel
of
3500

Obsolete Versions
Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2623A MDC
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2623A MWC
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2623ALDX
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2623EV
General Purpose, Gated Oscillator Based, DC/DC Boost ConverterFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide21
$59.00 each1

Features:

  • Good efficiency Over a Very Wide Load Range
  • Very Low Output Voltage Ripple
  • Small, Mini-SO-8 Package (half the Footprint of Standard 8 pin SO Package)
  • 1.09 mm Package height
  • Up to 2 MHz Switching Frequency
  • .8V to 14V Operating Voltage
  • 1.1V Start-up Voltage
  • 1.24V - 14V Adjustable Output Voltage
  • Up to 2A Load Current at low Output Voltages
  • 0.17 Ohm Internal MOSFET
  • Up to 90% Regulator Efficiency
  • 80 micro A Typical Operating Current (into Vdd pin of supply)
  • <2.5microA Guaranteed Supply Current in Shutdown
  • 4mm X 4 mm Thermally Enhanced LLP Package Option

Applications:

  • Cameras, Pagers and Cell Phones
  • PDAs, Palmtop Computers, GPS devices
  • White LED Drive, TFT or Scanned LCDs
  • Flash Memory Programming
  • Hand-Held Instruments
  • 1,2, 3 or 4 Cell Alkaline Systems
  • 1, 2, or 3 Cell Lithium-ion Systems

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM2623ALD/NOPB
LLP143260RoHSDownloadN/A
NS
UZXYTT
2623A
LM2623LD/NOPB
LLP143260RoHSDownloadN/A
NS
UZXYTT
2623AB
LM2623LDX/NOPB
LLP143260RoHSDownloadN/A
NS
UZXYTT
2623AB
LM2623AMM/NOPB
LM2623AMM
MINI SOIC81
1		260
260		RoHSDownloadN/A
ZXTT
S46A
LM2623MM/NOPB
MINI SOIC81260RoHSDownloadN/A
ZXTT
S46B
LM2623AMMX/NOPB
MINI SOIC81260RoHSDownloadN/A
ZXTT
S46A
LM2623MMX/NOPB
MINI SOIC81260RoHSDownloadN/A
ZXTT
S46B

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2623ALDABCD15003417500423400011201409060
LM2623AMMABCD15003417500423400011201409060
LM2623AMMXABCD15003417500423400011201409060
LM2623LDABCD15003417500423400011201409060
LM2623LDXABCD15003417500423400011201409060
LM2623MMABCD15003417500423400011201409060
LM2623MMXABCD15003417500423400011201409060

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
LM2623A MDC
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2623A MWC
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM2623ALDX
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008

[Information as of 20-Nov-2009]