LP55XX

CALIBRATION

MEMORY

SPI/I2C

INTER-

FACE

BOOST

ADC

COLOR AND

BRIGHTNESS

PWM LOGIC

LED

DRIVERS

MCU

WITH

I2C

OR

SPI

100 nF

4.7 PF

2.9 ± 5.5V

5 ± 20V

FB

SW

100 nF

2 x

4.7 PF

4.7 PH

L1

ROUT

LP5520

S1_IN

S2_IN

PWMR

PWMG

PWMB

NRST

SS/SDA

SCK/SCL

SI/A0

SO

IFSEL

100 nF

1 PF

BRC

GND

LM 20

GOUT

BOUT

D1

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LP5520

SNVS440B – MAY 2007 – REVISED MARCH 2016

LP5520 RGB Backlight LED Driver

1

1 Features

1

•

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 Red, Green, and

Blue (RGB) LED

•

0.2% Typical LED Output Current Matching

•

PWM Control Inputs for Each Color

•

•

Stand-Alone Mode With One-Wire Control

•

Sequential Mode for One Color at a Time

•

Magnetic High Efficiency Boost Converter

•

Programmable Output Voltage from 5 V to 20 V

•

Adaptive Output Voltage Control Option

•

< 2-µA Typical Shutdown Current

2 Applications

•

Color LCD Display Backlighting

•

LED Lighting Applications

3 Description

The LP5520 is an RGB backlight LED driver for small

format color LCDs. RGB backlights enable better

colors on the display and power savings compared

with white LED backlights. The device offers a small

and simple driver solution without need for optical

feedback. Calibration in display module production

can be done in one temperature. The LP5520

produces true white light over a 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 a supply voltage of up to 20 V LED from the

battery voltage. The output can be set at 1-V steps

from 5 V to 20 V. 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, for example, for

ambient light measurement.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (MAX)

LP5520

DSBGA (25)

2.787 mm × 2.621 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application