SNVS440B May   2007  – March 2016 LP5520

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Function
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  RGB Driver Electrical Characteristics (ROUT, GOUT, BOUT Outputs)
    7. 6.7  Logic Interface Characteristics
    8. 6.8  Magnetic Boost DC-DC Converter Electrical Characteristics
    9. 6.9  I2C Timing Parameters
    10. 6.10 SPI Timing Requirements
    11. 6.11 Typical Characteristics
      1. 6.11.1 RGB Driver Typical Characteristics
      2. 6.11.2 Boost Converter Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Start-Up Powering
      2. 7.3.2 RGB Driver Functionality
        1. 7.3.2.1 White Balance Control
        2. 7.3.2.2 LED Brightness Control
        3. 7.3.2.3 LED PWM Control
        4. 7.3.2.4 Sequential Mode
        5. 7.3.2.5 Current Control of the LEDs
        6. 7.3.2.6 Output Enables
        7. 7.3.2.7 Fade In and Fade Out
        8. 7.3.2.8 Temperature and Light Measurement
      3. 7.3.3 Magnetic High-Voltage Boost DC-DC Converter
        1. 7.3.3.1 Boost Control
        2. 7.3.3.2 Adaptive Output Voltage Control
    4. 7.4 Device Functional Modes
      1. 7.4.1 Manual Mode
      2. 7.4.2 Automatic Mode
      3. 7.4.3 Stand-Alone Mode
      4. 7.4.4 Start-Up Sequence
    5. 7.5 Programming
      1. 7.5.1 Control Interface
        1. 7.5.1.1 I2C Compatible Interface
          1. 7.5.1.1.1 I2C Signals
          2. 7.5.1.1.2 I2C Data Validity
          3. 7.5.1.1.3 I2C Start and Stop Conditions
          4. 7.5.1.1.4 Transferring Data
        2. 7.5.1.2 SPI Interface
          1. 7.5.1.2.1 SPI Incremental Addressing
      2. 7.5.2 EEPROM Memory
    6. 7.6 Register Maps
      1. 7.6.1 LP5520 Registers, Control Bits, and Default Values
        1. 7.6.1.1 Register Bit Conventions
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Typical Application: I2C-Bus Control
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Recommended External Components
            1. 8.2.1.2.1.1 Output Capacitor: COUT
            2. 8.2.1.2.1.2 Input Capacitor: CIN
            3. 8.2.1.2.1.3 Output Diode: DOUT
            4. 8.2.1.2.1.4 EMI Filter Components: CSW, RSW, LSW And CHF
            5. 8.2.1.2.1.5 Inductor: L1
            6. 8.2.1.2.1.6 List Of Recommended External Components
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Stand-Alone Typical Application
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 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 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

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