Features Temperature compensated LED intensity and color Individual calibration coefficients for each color Color accuracy ΔX and ΔY ≤ 0.003 12 bit ADC for measurement of 2 sensors Adjustable current outputs for R, G and B LED 0.2% typical LED output current matching PWM control inputs for each color SPI and I 2C compatible interface Stand-alone mode with 1 wire control Sequential mode for one color at a time Magnetic high efficiency boost converter Programmable output voltage from 5V to 20V Adaptive output voltage control option < 2 µA typical shutdown current MicroSMD-25 package, 2.77 × 2.59 × 0.6mm Description The LP5520 is an RGB backlight LED driver for small format color LCDs. RGB backlight enables better colors on the display and power savings compared with white LED backlight. LP5520 offers small and simple driver solution without need for optical feedback. Calibration in display module production can be done in one temperature. LP5520 produces true white light over wide temperature range. Three independent LED drivers have accurate programmable current sinks and PWM modulation control. Using internal calibration memory and external temperature sensor, the RGB LED currents are adjusted for perfect white balance independent of the brightness setting or temperature. The user programmable calibration memory has intensity vs. temperature data for each color. This white balance calibration data can be programmed to the memory on the production line of a backlight module. The device has a magnetic boost converter that creates up to 20V LED supply voltage from the battery voltage. The output can be set at 1V step from 5V to 20V. In adaptive mode the circuit automatically adjusts the output voltage to minimum sufficient level for lowest power consumption. Temperature is measured using an external temperature sensor placed close to the LEDs. The second ADC input can be used e.g. for ambient light measurement. LP5520 is available in 25 pin microSMD™ package. Applications Color LCD display backlighting LED lighting applications Non-linear temperature compensation Ambient light compensation

Typical Application *click for larger image	Block Diagram *click for larger image

Datasheets

Title		Size	Date	Other Language
	LP5520 RGB Backlight LED Driver	1036 Kbytes	2-May-07

Other Technical Documents

Title		Type	Date
	Backlight LED Driver System in Small Format Liquid Crystal Displays	External Article	2008-05-01
	LED Backlighting for LCDs Requires Unique Drivers	External Article	2008-05-12
	Color-Management LED Drivers Have a Bright Future	Power Designer	2007-06-20
	Optimizing Power Consumption in the Mobile Multimedia Infrastructure Delivery Chain - Part Two	External Article	2007-10-12

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LP5520TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 500 FARNELL Europe and Asia 250 MOUSER Worldwide 250 NEWARK Americas 250 RS COMPONENTS Worldwide 65	$1.85 each at 1K+ pcs	reel of 250
LP5520TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.85 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 LP5520.

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 LP5520 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LP5520TL/NOPB	8.423	MICRO SMD	25	1	260	Detail	N/A	N/A	XYTT I 5520
LP5520TLX/NOPB	8.423	MICRO SMD	25	1	260	Detail	N/A	N/A	XYTT I 5520

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 LP5520.

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 LP5520 is located at RoHS Status.

Design Tools

Title	Size	Date
Article - Optimizing Power Consumption in the Mobile Multimedia Delivery Chain - Part One
Article - Optimizing Power Consumption in the Mobile Multimedia Delivery Chain - Part Two

CAD Symbols and Models N/A

Models N/A