Features Drives up to 11 LED’s in series 1000:1 Dimming Ratio 90% Efficient Programmable Dual Ambient Light Sensor Inputs with internal ALS Voltage Setting Resistors I 2C Programmable Logarithmic or Linear Brightness Control External PWM Input for Simple Brightness Adjustment True Shutdown Isolation for LED's and Ambient Light Sensors Internal Soft-Start Limits Inrush Current Wide 2.7V to 5.5V Input Voltage Range 40V and 25V Over-Voltage Protection Options 500kHz Fixed Frequency Operation 839mA Peak Current Limit Low-Profile 12-bump micro SMD Package Description The LM3530 current mode boost converter supplies the power and controls the current in up to 11 series white LED’s. The 839mA current limit and 2.7V to 5.5V input voltage range make the device a versatile backlight power source ideal for operation in portable applications. The LED current is adjustable from 0 to 29.5mA via an I 2C-compatible interface. The 127 different current steps and 8 different maximum LED current levels give over 1000 programmable LED current levels. Additionally, PWM brightness control is possible through an external logic level input. The device also features two Ambient Light Sensor inputs. These are designed to monitor analog output ambient light sensors and provide programmable adjustment of the LED current with changes in ambient light. Each ambient light sensor input has independently programmable internal voltage setting resistors which can be made high impedance to reduce power during shutdown. The LM3530's 500kHz switching frequency allows for high converter efficiency over a wide output voltage range accommodating from 2 to 11 series LEDs. Finally, the support of Content Adjusted Backlighting maximizes battery life while maintaining display image quality. The LM3530 is available in a tiny 12-bump (1.6mm × 1.2mm × 0.425mm) micro SMD package and operates over the −40°C to +85°C temperature range. Applications Smartphone LCD Backlighting Personal Navigation LCD Backlighting 2 to 11 series White LED Backlit Display Power Source

typ app circuit

Typical Application click for larger image typ app circuit	Block Diagram click for larger image PWM + I2C control Equation
Typical Performance click for larger image efficiency vs VIN 4, 7, 10 LEDs

Parameters Values Regulated LEDs 11 Total LED Current 30 mA Boost Type Inductive Switching Frequency 500 kHz Efficiency (peak) 90 % Input Min Voltage 2.7 Volt Input Max Voltage 5.5 Volt OutputMax Voltage 40 Volt Boost Voltage Regulated LED Configuration Series Supply Current 1.35 mA Switching Type Fixed Freq Special Features I2C Compatible Interface, 10 bit Current Control, Dual Ambient Light Sensor Current Control, Internal ALS Gain Setting Resistors, 25V option, 1000:1 Dimming Ratio, Programmable Current Ramp Rates PWM BrightCtrl Yes Analog-V BrightCtrl No Ambient Light Compensation Yes RGB-LED No Temperature Min -30 deg C Temperature Max 85 deg C RegType Switching Regulator PowerWise Yes

Datasheets

Title		Size	Date	Other Language
	LM3530 High Efficiency White LED Driver with Programmable Ambient Light Sensing Capability and I2C Compatible Interface	3063 Kbytes	20-Aug-11

Other Technical Documents

Title		Type	Date
	A Holistic Approach To Reducing Backlight Power Consumption	External Article	2011-10-31

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM3530UME-25A/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 359 MOUSER Worldwide 250	$1.60 each at 1K+ pcs	reel of 250
LM3530UME-40/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 358 FARNELL Europe and Asia 230 MOUSER Worldwide 205 NEWARK Americas 230	$1.60 each at 1K+ pcs	reel of 250
LM3530UME-40B/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.60 each at 1K+ pcs	reel of 250
LM3530UMX-25A/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.60 each at 1K+ pcs	reel of 3000
LM3530UMX-40/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty CEAC Asia Pacific 30000 DIGI-KEY Worldwide 0	$1.60 each at 1K+ pcs	reel of 3000
LM3530UMX-40B/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.60 each at 1K+ pcs	reel of 3000

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

Moisture Sensitivity Level Data for LM3530.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3530 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM3530EV-KIT	evaluation board	Full production	Contact your distributor	CALL	N/A

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM3530UME-25A/NOPB	2.015	MICRO SMD	12	1	260	Detail	N/A	N/A	XV I DS
LM3530UME-40/NOPB	2.015	MICRO SMD	12	1	260	Detail	N/A	N/A	XV I 40
LM3530UME-40B/NOPB	2.015	MICRO SMD	12	1	260	Detail	N/A	N/A	XV I DT
LM3530UMX-25A/NOPB	2.015	MICRO SMD	12	1	260	Detail	N/A	N/A	XV I DS
LM3530UMX-40/NOPB	2.015	MICRO SMD	12	1	260	Detail	N/A	N/A	XV I 40
LM3530UMX-40B/NOPB	2.015	MICRO SMD	12	1	260	Detail	N/A	N/A	XV I DT

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

Moisture Sensitivity Level Data for LM3530.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3530 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3530UME-25A	CMOS7	0	21301	0	0	1584000	3	449464325
LM3530UME-40	CMOS7	0	21301	0	0	1584000	3	449464325
LM3530UME-40B	CMOS7	0	21301	0	0	1584000	3	449464325
LM3530UMX-25A	CMOS7	0	21301	0	0	1584000	3	449464325
LM3530UMX-40	CMOS7	0	21301	0	0	1584000	3	449464325
LM3530UMX-40B	CMOS7	0	21301	0	0	1584000	3	449464325

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/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3530.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3530 is located at RoHS Status.

LM3530 Content-Adjustable Backlighting Demo Loading video... What's New in Power Management -- Sept 09 Loading video...

LM3530 Content-Adjustable Backlighting Demo Date: 2009-07-02 Length: 0:02:25 What's New in Power Management -- Sept 09 Date: 2009-10-20 Length: 0:05:48