LP5520_16 Datasheet, PDF (1/46 Pages) Texas Instruments – RGB Backlight LED Driver

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LP5520
SNVS440B – MAY 2007 – REVISED MARCH 2016
LP5520 RGB Backlight LED Driver
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
• SPI™ and I²C-Compatible Interface
• 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
2.9 ± 5.5V
1 PF
CVLDO
MCU
WITH
I2C
OR
SPI
CVDDIO
100 nF
L1
D1
CVDDA
100 nF
CVDDD
100 nF
CIN
4.7 PF
VLDO
VDDA
VDDD
4.7 PH
SW
COUT
2x
4.7 PF
S1_IN
S2_IN
ADC
CALIBRATION
MEMORY
BOOST
FB
VLDO
NRST
SS/SDA
SCK/SCL
SI/A0
SO
IFSEL
VDDIO
SPI/I2C
INTER-
FACE
PWMR
PWMG
PWMB
BRC
LP55XX
LP5520
COLOR AND
BRIGHTNESS
PWM LOGIC
LED
DRIVERS _ROUT
GOUT
BOUT
GND
5 ± 20V
LM 20
1
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.