SNOSCR5D March   2013  – December 2016 LP55231

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  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  Charge Pump Electrical Characteristics
    7. 6.7  LED Driver Electrical Characteristics
    8. 6.8  LED Test Electrical Characteristics
    9. 6.9  Logic Interface Characteristics
    10. 6.10 Recommended External Clock Source Conditions
    11. 6.11 Serial Bus Timing Parameters (SDA, SCL)
    12. 6.12 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 Programming
      2. 7.3.2 LED Error Detection
      3. 7.3.3 Energy Efficiency
      4. 7.3.4 Temperature Compensation
      5. 7.3.5 Charge Pump Operational Description
        1. 7.3.5.1 Overview
        2. 7.3.5.2 Output Resistance
        3. 7.3.5.3 Controlling The Charge Pump
        4. 7.3.5.4 LED Forward Voltage Monitoring
        5. 7.3.5.5 Gain Change Hysteresis
      6. 7.3.6 LED Driver Operational Description
        1. 7.3.6.1 Overview
        2. 7.3.6.2 Powering LEDs
        3. 7.3.6.3 Controlling The High-Side LED Drivers
      7. 7.3.7 Automatic Power-Save Mode
      8. 7.3.8 PWM Power-Save Mode
    4. 7.4 Device Functional Modes
      1. 7.4.1 Modes Of Operation
    5. 7.5 Programming
      1. 7.5.1 I2C-Compatible Control Interface
        1. 7.5.1.1 Data Validity
        2. 7.5.1.2 Start And Stop Conditions
        3. 7.5.1.3 Transferring Data
      2. 7.5.2 I2C-Compatible Chip Address
        1. 7.5.2.1 Control Register Write Cycle
        2. 7.5.2.2 Control Register Read Cycle
        3. 7.5.2.3 Auto-Increment Feature
    6. 7.6 Register Maps
      1. 7.6.1 Register Set
      2. 7.6.2 Control Register Details
      3. 7.6.3 Instruction Set
      4. 7.6.4 LED Driver Instructions
        1. 7.6.4.1 Ramp
        2. 7.6.4.2 Ramp Instruction Application Example
        3. 7.6.4.3 Set_PWM
        4. 7.6.4.4 Wait
      5. 7.6.5 LED Mapping Instructions
        1. 7.6.5.1  MUX_LD_START; MUX_LD_END
        2. 7.6.5.2  MUX_MAP_START
        3. 7.6.5.3  MUX_SEL
        4. 7.6.5.4  MUX_CLR
        5. 7.6.5.5  MUX_MAP_NEXT
        6. 7.6.5.6  MUX_LD_NEXT
        7. 7.6.5.7  MUX_MAP_PREV
        8. 7.6.5.8  MUX_LD_PREV
        9. 7.6.5.9  MUX_MAP_ADDR
        10. 7.6.5.10 MUX_LD_ADDR
      6. 7.6.6 Branch Instructions
        1. 7.6.6.1 BRANCH
        2. 7.6.6.2 INT
        3. 7.6.6.3 RST
        4. 7.6.6.4 END
        5. 7.6.6.5 TRIGGER
      7. 7.6.7 Arithmetic Instructions
        1. 7.6.7.1 LD
        2. 7.6.7.2 ADD
        3. 7.6.7.3 SUB
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Using Two LP55231 in the Same Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Driving Haptic Feedback with LP55231
        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 Trademarks
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    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

  • Three Independent Program Execution Engines, 9 Programmable Outputs With 25.5-mA Full-Scale Current, 8-Bit Current Setting Resolution and
    12-Bit PWM Control Resolution
  • Adaptive High-Efficiency 1×/1.5× Fractional Charge Pump - Efficiency up to 94%
  • LED Drive Efficiency Up to 93%
  • Charge Pump With Soft Start
  • Overcurrent and Short-Circuit Protection
  • Built-in LED Test
  • 200-nA Typical Standby Current
  • Automatic Power Save Mode; IVDD = 10 µA (Typical)
  • Two-Wire I2C-Compatible Control Interface
  • Flexible Instruction Set
  • Large SRAM Program Memory
  • Small Application Circuit
  • Source (High-Side) Drivers
  • Architecture Supports Color Control

2 Applications

  • Fun Lights and Indicator Lights
  • LED Backlighting
  • Haptic Feedback
  • Programmable Current Source
  • Fire Notification
  • Electronic Thermostats
  • Electronic Locks
  • Robotics
  • Intruder Notification
  • Light Switches and Dimmers
  • Gaming and Smart Headphones
  • Speakers

3 Description

The LP55231 is a 9-channel LED driver designed to produce lighting effects for mobile devices. A high-efficiency charge pump enables LED driving over full Li-Ion battery voltage range. The device is equipped with an internal program memory, which allows operation without processor control.

The LP55231 has an I2C-compatible control interface with four pin-selectable addresses. The INT pin can be used to notify processor when a lighting sequence has ended (interrupt function). Also, the device has a trigger input interface, which allows synchronization, for example, between multiple LP55231 devices. Excellent efficiency is maintained over a wide operating range by autonomously selecting the best charge pump gain based on LED forward voltage requirements. The device is able to automatically enter power-save mode when LED outputs are not active, thus lowering idle current consumption down to 10 µA (typical). Only four small and low-cost ceramic capacitors are required.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LP55231 WQFN (24) 4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

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Typical Application

LP55231 30198601.gif

4 Revision History

Changes from C Revision (November 2016) to D Revision

  • Added top nav icon for TI Designs Go
  • Changed variable 1 spanning to go from Bit [3] to Bit [2] and variable 2 span from Bit [1] to Bit [0] in table 7 Go

Changes from B Revision (May 2016) to C Revision

  • Changed wording of data sheet titleGo

Changes from A Revision (October 2014) to B Revision

  • Added several new Applications Go
  • Changed Handling Ratings to ESD Ratings; moved storage temperature to Abs Max table Go
  • Changed RθJA value from 36.6C/W to 33.3C/W; add additional thermal informationGo
  • Added Community Resources section Go

Changes from * Revision (March 2013) to A Revision

  • Added Device Information and Handling Rating tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sections; moved some curves to Application Curves section Go