MAX20444

NOT RECOMMENDED FOR NEW DESIGNS

Automotive 4-Channel 130mA Backlight Driver with Boost/SEPIC Controller and I2C Interface

4-Channel 130mA LED Driver Provides Full Diagnostics and Hybrid Dimming thru I2C

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Part Details

  • Wide-Voltage-Range Operation
    • Operates Down to 4V Supply after Startup
    • Survives Load Dump up to 52V
  • High Integration
    • Complete 4-Channel Solution Including Boost Controller
    • I2C Control for Minimum Parts Count
  • Robust and Low EMI
    • Spread-Spectrum Oscillator
    • Phase Shifting
    • 400kHz to 2.2MHz Switching-Frequency Range
    • Fail-Safe Operation Mode Using the FSEN Pin
  • Versatile Dimming Scheme Allows Hybrid or PWM-Only Dimming Using DIM Input or I2C
    • Dimming Ratio > 10000:1 Using Hybrid Dimming
    • 10000:1 Dimming Ratio at 200Hz using PWM Dimming
  • Complete Diagnostics
    • LED Open/Short Detection and Protection
    • Boost Output Undervoltage and Overvoltage
    • Boost Voltage
    • Individual String LED Current
    • Thermal Shutdown
  • Compact (4mm x 4mm) 24-Pin TQFN and SWTQFN Packages
MAX20444
Automotive 4-Channel 130mA Backlight Driver with Boost/SEPIC Controller and I2C Interface
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Documentation

Technical Articles 3

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Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA).

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • MAX20444B
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

MAX20444EVKIT

Evaluation Kit for the MAX20444

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Features and Benefits

  • Demonstrates Robustness of MAX20444
  • Wide 4.5V to 36V Input Operating Range (Up to 52V Load Dump)
  • Powers HB LEDs (Up to four strings) for Medium-to- Large-Sized LCD Displays in Automotive and Display Backlight Applications
  • 400kHz to 2.2MHz Resistor-Programmable Switching Frequency with Spread-Spectrum Option
  • Phase-Shift Dimming Option
  • Demonstrates Cycle-by-Cycle Current Limit and Thermal-Shutdown Features
  • Demonstrates Wide Dimming Ratio
  • Demonstrates Failsafe Operation
  • I2C Programmability
  • Dedicated GUI
  • Proven PCB and Thermal Design
  • Fully Assembled and Tested

Product Details

The MAX20444 evaluation kit (EV kit) demonstrates the MAX20444 integrated, 4-channel, high-brightness LED driver with boost controller and I2C interface for automotive displays.

The EV kit operates from a DC supply voltage between 4.5V and 36V, and the switching frequency can be set at either 2.2MHz or 400kHz. The EV kit can be configured to operate in stand-alone mode or in I2C mode. Spread-spectrum mode (SSM) for EMI improvement is enabled by default, but it can be disabled trough a register bit. The EV kit demonstrates phase-shifted pulse-width modulation (PWM) dimming, which can be performed either externally using a PWM signal applied to the DIM PCB pad or internally by programming the desired dimming frequency and individual duty cycle using I2C. The hybrid dimming feature can also be enabled through a register bit to reduce EMI. The EV kit also demonstrates fault protection for short LED, open LED, boost output undervoltage and overvoltage, and overtemperature.

For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the MAX20444 IC data sheet.

The EV kit provides an I2C interface that can operate in conjunction with the MINIQUSB+ adapter board or a third party I2C master. The EV kit also includes Windows®- compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC.

Applications

  • Central Information Displays
  • Infotainment Displays
  • Instrument Clusters
MAX20444EVKIT
Evaluation Kit for the MAX20444

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