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LP5520
SNVS440B –MAY 2007–REVISED MARCH 2016
LP5520 RGB Backlight LED Driver
1 Features
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.
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
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.
2 Applications
•
•
Color LCD Display Backlighting
LED Lighting Applications
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
D1
L1
2.9 œ 5.5V
5 œ 20V
4.7 mH
C
C
C
VDDA
VDDD
IN
C
OUT
2 x
100 nF
100 nF
4.7 mF
4.7 mF
1 mF
V
V
DDD
SW
DDA
V
LDO
C
VLDO
S1_IN
S2_IN
CALIBRATION
MEMORY
FB
ADC
BOOST
V
LDO
LM 20
NRST
SS/SDA
SCK/SCL
LP5520
MCU
WITH
I2C
SPI/I2C
INTER-
FACE
LP55XX
SI/A0
SO
OR
SPI
IFSEL
V
DDIO
COLOR AND
BRIGHTNESS
PWM LOGIC
LED
DRIVERS
ROUT
GOUT
BOUT
PWMR
PWMG
PWMB
BRC
C
VDDIO
100 nF
GND
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.