LM3503   
Dual-Display Constant Current LED Driver with Analog Brightness Control from the PowerWise® Family		 Click link to Download

Features
•Drives up to 4, 6, 8 or 10 White LEDs for Dual Display Backlighting
•>80% Peak Efficiency
•Output Voltage Protection Options: 16V, 25V, 35V & 44V
•Input Under-Voltage Protection
•Internal Soft Start Eliminates Inrush Current
•1 MHz Constant Switching Frequency
•Analog Brightness Control
•Wide Input Voltage Range: 2.5V to 5.5V
•Low Profile Packages: <1 mm Height
•10 Bump MicroSMD
•16 Pin LLP

Description

The LM3503 is a white LED driver for lighting applications. For dual display backlighting applications, the LM3503 provides a complete solution. The LM3503 contains two internal white LED current bypass FET (Field Effect Transistor) switches. The white LED current can be adjusted with a DC voltage from a digital to analog converter or RC filtered PWM (pulse-width-modulated) signal at the Cntrl pin.

With no external compensation, cycle-by-cycle current limit, output over-voltage protection, input under-voltage protection, and dynamic white LED current control capability, the LM3503 offers superior performance over other step-up white LED drivers.

Applications
•Dual Display Backlighting in Portable devices
•Cellular Phones and PDAs



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

                                              LM3503
Drag-Select for Table Reset Graph

Typical Application
click for larger image


Block Diagram
click for larger image



Typical Performance
click for larger image


 

ParametersValues
Regulated LEDs 10
Total LED Current 20 mA
Boost Type Inductive
Switching Frequency 1000 kHz
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
OutputMax Voltage 44 Volt
Boost Voltage Regulated
LED Configuration Series
Switching Type Fixed Freq
PWM BrightCtrl Yes
Analog-V BrightCtrl Yes
Temperature Min -40 deg C
Temperature Max 85 deg C
RegType WhiteLED Driver
PowerWise Yes

Datasheets
TitleSizeDateOther
Language
LM3503 Dual-Display Constant Current LED Driver with Analog Brightness Control1066
Kbytes		30-Aug-06 


Featured Application Notes
TitleSizeDateOther
Language
AN-1407: Application Note 1407 AN-1407 LM3502/03 Evaluation Board519
Kbytes		18-Jul-06 中文


More Application Notes
TitleSizeDateOther
Language
AN-1593: Application Note 1593 LM3508 Evaluation Board612
Kbytes		5-Jun-07 
AN-1594: Application Note 1594 LM3509 Evaluation Board1020
Kbytes		5-Jun-07 
AN-1309: Application Note 1309 LM3500 Evaluation Board35
Kbytes		12-Feb-04 
AN-1318: Application Note 1318 LM3501 Evaluation Board36
Kbytes		12-Feb-04 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3503ITL-16/NOPB

RoHS Status



MICRO SMD		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide487
FARNELLEurope and Asia49
NEWARKAmericas250
$2.10 each at 1K+ pcsreel
of
250
LM3503ITL-25/NOPB

RoHS Status



MICRO SMD		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide500
FARNELLEurope and Asia250
NEWARKAmericas250
$2.10 each at 1K+ pcsreel
of
250
LM3503ITL-35/NOPB

RoHS Status



MICRO SMD		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide23
FARNELLEurope and Asia250
NEWARKAmericas250
RS COMPONENTSWorldwide5
$2.10 each at 1K+ pcsreel
of
250
LM3503ITL-44/NOPB

RoHS Status



MICRO SMD		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide940
FARNELLEurope and Asia249
NEWARKAmericas248
RS COMPONENTSWorldwide995
$2.10 each at 1K+ pcsreel
of
250
LM3503ITLX-16/NOPB

RoHS Status



MICRO SMD		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$2.10 each at 1K+ pcsreel
of
3000
LM3503ITLX-25/NOPB

RoHS Status



MICRO SMD		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$2.10 each at 1K+ pcsreel
of
3000
LM3503ITLX-35/NOPB

RoHS Status



MICRO SMD		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$2.10 each at 1K+ pcsreel
of
3000
LM3503ITLX-44/NOPB

RoHS Status



MICRO SMD		Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$2.10 each at 1K+ pcsreel
of
3000
LM3503SQ-16/NOPB
LM3503SQ-16

RoHS Status



LLP		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide4949
FARNELLEurope and Asia139
NEWARKAmericas1000
$2.10 each at 1K+ pcsreel
of
1000
LM3503SQ-25/NOPB
LM3503SQ-25

RoHS Status



LLP		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide837
FARNELLEurope and Asia50
NEWARKAmericas1000
$2.10 each at 1K+ pcsreel
of
1000
LM3503SQ-35/NOPB
LM3503SQ-35

RoHS Status



LLP		Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide3990
FARNELLEurope and Asia50
NEWARKAmericas1000
$2.10 each at 1K+ pcsreel
of
1000
LM3503SQ-44/NOPB
LM3503SQ-44

RoHS Status



LLP		Full production
Lead Time: 16 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1621
FARNELLEurope and Asia788
$2.10 each at 1K+ pcsreel
of
1000
LM3503SQX-16/NOPB
LM3503SQX-16

RoHS Status



LLP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$2.10 each at 1K+ pcsreel
of
4500
LM3503SQX-25/NOPB
LM3503SQX-25

RoHS Status



LLP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$2.10 each at 1K+ pcsreel
of
4500
LM3503SQX-35/NOPB
LM3503SQX-35

RoHS Status



LLP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$2.10 each at 1K+ pcsreel
of
4500
LM3503SQX-44/NOPB
LM3503SQX-44

RoHS Status



LLP		Full production
Lead Time: 16 weeks

 

Contact your distributor
$2.10 each at 1K+ pcsreel
of
4500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3503ITL-25EV
Dual-Display Constant Current LED Driver with Analog Brightness ControlFull production


 
DistributorRegionQty
DIGIKEYWorldwide5
NATIONALWorldwide12
$95.00 each1

Description:

The LM3503 is a white LED driver for lighting applications. For dual display backlighting applications, the LM3503 provides a complete solution. The LM3503 contains two internal white LED current bypass FET (Field Effect Transistor) switches. The white LED current can be adjusted with a DC voltage from a digital to analog converter or RC filtered PWM (pulse-width-modulated) signal at the Cntrl pin.

With no external compensation, cycle-by-cycle current limit, output over-voltage protection, input under voltage protection, and dynamic white LED current control capability, the LM3503 offers superior performance over other step-up white LED drivers.

The LM3502/03 evaluation board is a working demonstration of a step up DC-DC converter. The LM3502/03 can drive up to 10 white LEDs. For evaluation purposes, the evaluation board is assembled in a micro SMD package for the 25V version (LM3503ITL) and the 44V version (LM3502ITL). The LM3502/03 are also available in a 16-LLP package (see ordering information). For further information on boost converter topology, device electrical characteristics, and component selection, please refer to the the LM3502 and LM3503 datasheets.

Features:

  • Drives up to 4, 6, 8, or 10 White LEDs for Dual Display Backlighting
  • >80% Peak Efficiency
  • Output Voltage Protection Options: 16V, 25V, 35V, and 44V
  • Input Under-Voltage Protection
  • Internal Soft Start Eliminates Inrush Current
  • 1 MHz Constant-Switching Frequency
  • Analog Brightness Control
  • Wide Input Voltage: 2.5V to 5.5V
  • Low Profile Packages: <1 mm Height
        ---10 Bump MicroSMD
        ---16 Pin LLP

Applications:

  • Dual-Display Backlighting in Portable devices
  • Cellular Phones and PDAs

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHS
Status		CAD SymbolsModelsPackage
Marking
Format
LM3503ITL-16/NOPB
MICRO SMD101260DetailDownloadN/A
XYTT
I SBHB
LM3503ITL-25/NOPB
MICRO SMD101260DetailDownloadN/A
XYTT
I SBJB
LM3503ITL-35/NOPB
MICRO SMD101260DetailDownloadN/A
XYTT
I SBKB
LM3503ITL-44/NOPB
MICRO SMD101260DetailDownloadN/A
XYTT
I SDNB
LM3503ITLX-16/NOPB
MICRO SMD101260DetailDownloadN/A
XYTT
I SBHB
LM3503ITLX-25/NOPB
MICRO SMD101260DetailDownloadN/A
XYTT
I SBJB
LM3503ITLX-35/NOPB
MICRO SMD101260DetailDownloadN/A
XYTT
I SBKB
LM3503ITLX-44/NOPB
MICRO SMD101260DetailDownloadN/A
XYTT
I SDNB
LM3503SQ-16/NOPB
LM3503SQ-16
LLP161
1		260
260		DetailDownloadN/A
NS
UZXYTT
L00045B
LM3503SQ-25/NOPB
LM3503SQ-25
LLP161
1		260
260		DetailDownloadN/A
NS
UZXYTT
L00046B
LM3503SQ-35/NOPB
LM3503SQ-35
LLP161
1		260
260		DetailDownloadN/A
NS
UZXYTT
L00047B
LM3503SQ-44/NOPB
LM3503SQ-44
LLP161
1		260
260		DetailDownloadN/A
NS
UZXYTT
L00053B
LM3503SQX-16/NOPB
LM3503SQX-16
LLP161
1		260
260		DetailDownloadN/A
NS
UZXYTT
L00045B
LM3503SQX-25/NOPB
LM3503SQX-25
LLP161
1		260
260		DetailDownloadN/A
NS
UZXYTT
L00046B
LM3503SQX-35/NOPB
LM3503SQX-35
LLP161
1		260
260		DetailDownloadN/A
NS
UZXYTT
L00047B
LM3503SQX-44/NOPB
LM3503SQX-44
LLP161
1		260
260		DetailDownloadN/A
NS
UZXYTT
L00053B

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

CAD Symbols and Models
Download LM3503 CAD Symbols
 Models
N/A

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3503ITL-16ABCD15003417500423400011201409060
LM3503ITL-25ABCD15003417500423400011201409060
LM3503ITL-35ABCD15003417500423400011201409060
LM3503ITL-44ABCD15003417500423400011201409060
LM3503ITLX-16ABCD15003417500423400011201409060
LM3503ITLX-25ABCD15003417500423400011201409060
LM3503ITLX-35ABCD15003417500423400011201409060
LM3503ITLX-44ABCD15003417500423400011201409060
LM3503SQ-16ABCD15003417500423400011201409060
LM3503SQ-25ABCD15003417500423400011201409060
LM3503SQ-35ABCD15003417500423400011201409060
LM3503SQ-44ABCD15003417500423400011201409060
LM3503SQX-16ABCD15003417500423400011201409060
LM3503SQX-25ABCD15003417500423400011201409060
LM3503SQX-35ABCD15003417500423400011201409060
LM3503SQX-44ABCD15003417500423400011201409060

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.


All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

[Information as of 9-Feb-2010]