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

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Datasheets

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

More Application Notes

Title		Size	Date	Other Language
	AN-1632: AN-1632 LP5521TM Evaluation Kit	2062 Kbytes	16-Jan-09
	AN-1502: AN-1502 LP5526 Evaluation Kit	2362 Kbytes	12-Mar-07
	AN-1636: AN-1636 LP5522 Evaluation Kit	1568 Kbytes	13-Jun-07	中文
	AN-1702: AN-1702 LP5524 Evaluation Kit	491 Kbytes	17-Mar-08
	AN-1523: AN-1523 LP5521 Power Efficiency Considerations	5526 Kbytes	17-Apr-08	中文
	AN-1562: AN-1562 LP5521 Programming Considerations	761 Kbytes	17-Apr-08
	AN-1442: Application Note 1442 Design and Programming Examples for Lighting Management Unit LP5526	749 Kbytes	26-Jan-07	中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LP5520TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 307 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 DIGIKEY 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/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.

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.

Design Tools

Title	Size	Date
Article - Powering Backlights in Portable Devices
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