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LP5520 RGB Backlight LED Driver Datasheet

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LP5520 RGB Backlight LED Driver Datasheet Product Sample & Technical Tools & Support & Folder Buy Documents Software Community 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 1• Temperature Compensated LED Intensity and Color format color LCDs. RGB backlights enable better colors on the display and power savings compared • Individual Calibration Coefficients for Each Color with white LED backlights. The device offers a small • Color Accuracy ΔX and ΔY ≤ 0.003 and simple driver solution without need for optical • 12-Bit ADC for Measurement of 2 Sensors feedback. Calibration in display module production can be done in one temperature. The LP5520 • Adjustable Current Outputs for Red, Green, and produces true white light over a wide temperature Blue (RGB) LED range. Three independent LED drivers have accurate • 0.2% Typical LED Output Current Matching programmable current sinks and PWM modulation • PWM Control Inputs for Each Color control. Using internal calibration memory and external temperature sensor, the RGB LED currents • SPI™ and I2C-Compatible Interface are adjusted for perfect white balance independent of • Stand-Alone Mode With One-Wire Control the brightness setting or temperature. The user • Sequential Mode for One Color at a Time programmable calibration memory has intensity vs • Magnetic High Efficiency Boost Converter temperature data for each color. This white balance calibration data can be programmed to the memory • Programmable Output Voltage from 5 V to 20 V on the production line of a backlight module. • Adaptive Output Voltage Control Option The device has a magnetic boost converter that • < 2-µA Typical Shutdown Current creates a supply voltage of up to 20 V LED from the battery voltage. The output can be set at 1-V steps 2 Applications from 5 V to 20 V. In adaptive mode the circuit • Color LCD Display Backlighting automatically adjusts the output voltage to minimum sufficient level for lowest power consumption. • LED Lighting Applications 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 D1 2.9 ± 5.5V L1 5 ± 20V CVDDA CVDDD CIN 4.7 mH COUT 100 nF100 nF 4.7 mF -+ 2 x 4.7 mF 1 mF VDDA VDDD SW VLDO CVLDO S1_IN CALIBRATION FB ADC BOOST S2_IN MEMORY VLDO LM 20 NRST LP5520 SS/SDA MCU SCK/SCL SPI/I2C LP55XX WITH SI/A0 INTER- I2C SO FACE OR SPI IFSEL VDDIO COLOR AND LED BRIGHTNESS DRIVERS ROUT PWMR PWM LOGIC PWMG GOUT CVDDIO PWMB BOUT 100 nF BRC 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. LP5520 SNVS440B –MAY 2007–REVISED MARCH 2016 www.ti.com Table of Contents 1 Features .................................................................. 1 7.2 Functional Block Diagram ......................................... 9 2 Applications ........................................................... 1 7.3 Feature Description................................................... 9 3 Description ............................................................. 1 7.4 Device Functional Modes........................................ 18 4 Revision History..................................................... 2 7.5 Programming........................................................... 22 7.6 Register Maps......................................................... 28 5 Pin Configuration and Function ........................... 3 8 Application and Implementation ........................ 33 6 Specifications......................................................... 4 8.1 Application Information............................................ 33 6.1 Absolute Maximum Ratings ...................................... 4 8.2 Typical Applications ............................................... 33 6.2 ESD Ratings.............................................................. 4 6.3 Recommended Operating Conditions....................... 4 9 Power Supply Recommendations...................... 37 6.4 Thermal Information.................................................. 4 10 Layout................................................................... 37 6.5 Electrical Characteristics........................................... 5 10.1 Layout Guidelines ................................................. 37 6.6 RGB Driver Electrical Characteristics (ROUT, GOUT, 10.2 Layout Example .................................................... 38 BOUT Outputs) .......................................................... 5 11 Device and Documentation Support ................. 39 6.7 Logic Interface Characteristics.................................. 6 11.1 Device Support...................................................... 39 6.8 Magnetic Boost DC-DC Converter Electrical 11.2 Documentation Support ........................................ 39 Characteristics ........................................................... 6 11.3 Community Resources.......................................... 39 2 6.9 I C Timing Parameters ............................................. 7 11.4 Trademarks ........................................................... 39 6.10 SPI Timing Requirements ....................................... 7 11.5 Electrostatic Discharge Caution............................ 39 6.11 Typical Characteristics............................................ 8 11.6 Glossary ................................................................ 39 7 Detailed Description .............................................. 9 12 Mechanical, Packaging, and Orderable 7.1 Overview ................................................................... 9 Information ........................................................... 40 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision A (May 2013) to Revision B Page • Changed "R, G and B" to "Red, Green, and Blue"................................................................................................................. 1 • Deleted "Non-Linear Temperature Compensation" and "Ambient Light Compensation" from Applications ......................... 1 • Added Device Information and Pin Configuration and Functions sections, ESD Ratings and Thermal Information tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sections................................................................................................................................................................ 1 • Changed "MAIN, SUB" to " ROUT, GOUT, BOUT"................................................................................................................ 4 • Changed "come" to "are loaded" .......................................................................................................................................... 12 • Changed ", and also the variable" to ". The variable parameter"......................................................................................... 18 • Changed "makes possible" to "allows" ................................................................................................................................. 19 • Changed "read" to "loaded".................................................................................................................................................. 19 • Changed "The stand-alone mode must be inhibited in automatic and manual modes by writing the control bit <brc_off> high and by keeping BRC input low." to new text .............................................................................................. 19 Changes from Original (April 2013) to Revision A Page • Changed layout of National Data Sheet to TI format ........................................................................................................... 32 2 Submit Documentation Feedback Copyright © 2007–2016, Texas Instruments Incorporated Product Folder Links: LP5520 LP5520 www.ti.com SNVS440B –MAY 2007–REVISED MARCH 2016 5 Pin Configuration and Function YZR Packge YZR Packge 25-Pin DSBGA 25-Pin DSBGA Top View Bottom View SI/ SI/ 5 SO VDDD FB SW SW FB VDDD SO 5 A0 A0 SS/ SCK/ GND GND SCK/ SS/ 4 IFSEL PWMR PWMR IFSEL 4 SDA SCL _SW _SW SCL SDA GND GND 3 VDDIO NRST PWMG GNDA GNDA PWMGNRST VDDIO 3 _LED _LED 2 VLDO BRC S2_IN PWMB ROUT ROUTPWMB S2_IN BRC VLDO 2 1 VDDA GNDT S1_IN BOUT GOUT GOUT BOUT S1_IN GNDT VDDA 1 A B C D E E D C B A Pin Functions PIN TYPE DESCRIPTION NUMBER NAME 1A VDDA Power Supply voltage for analog circuitry 1B GNDT Ground Ground/Test 1C S1_IN Input ADC input 1, input for temperature sensor 1D BOUT Output Blue LED output 1E GOUT Output Green LED output 2A VLDO Power Internal LDO output 2B BRC Logic Input Brightness control for all LED outputs 2C S2_IN Input ADC input 2, input for optional second sensor 2D PWMB Logic Input PWM control for output B 2E ROUT Output Red LED output 3A VDDIO Power Supply voltage for input/output buffers and drivers 3B NRST Logic Input Master reset, active low 3C PWMG Logic Input PWM control for output G 3D GNDA Ground Ground for
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