MAX20446C

PRODUCTION

Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and Hybrid Dimming

6-Channel 130mA LED Driver Provides Full Diagnostics and Hybrid Dimming

Data Sheet (Rev. 2) Product Selection Table
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Overview

  • Wide Voltage-Range Operation
    • Operates down to 4.2V Supply after Startup
    • Survives Load Dump up to 52V
  • High Integration
    • Complete 6-Channel Solution Including Boost Controller
    • All Settings Performed with External Components, No Need for Microcontroller Intervention
  • Robust and Low EMI
    • Spread-Spectrum Oscillator
    • Phase Shifting
    • 400kHz to 2.2MHz Switching-Frequency Range
  • Versatile Dimming Scheme Allows Hybrid or PWM-Only Dimming
    • Dimming Ratio > 10000:1 Using Hybrid Dimming
    • 10000:1 Dimming Ratio at 200Hz Using PWM Dimming
  • Complete Fault Protection
    • LED Open/Short Detection and Protection
    • Boost Output Undervoltage and Overvoltage
    • Thermal Shutdown
  • Compact (4mm x 4mm) 24-Pin TQFN Package

The MAX20446C is a 6-channel backlight driver with boost controller for automotive displays. The integrated current outputs can sink up to 130mA LED current each. The device accepts a wide 4.5V to 36V input voltage range and withstands automotive load-dump events.

The internal current-mode switching DC-DC controller supports boost or SEPIC topologies, and operates in the 400kHz to 2.2MHz frequency range. Integrated spread spectrum helps reduce EMI. An adaptive output-voltage control scheme minimizes power dissipation in the LED current-sink paths.

The device features pulse-width modulation (PWM) dimming and hybrid dimming. In either case, the minimum pulse width is 500ns. Optional phase-shifted dimming of the strings is incorporated for lower EMI.

The MAX20446C is exceptionally easy to configure using a single resistor on the SET pin.

The device is available in a 24-pin TQFN package and operates over the -40°C to +125°C temperature range.

 

Applications

  • Infotainment Displays
  • Central Information Displays
  • Instrument Clusters
MAX20446C
Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and Hybrid Dimming
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

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Tools & Simulations

Software Development 1

Evaluation Kits

MAX20446CEVKIT

Evaluation Kit for the MAX20446C

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Features and Benefits

  • Demonstrates Robustness of MAX20446C
  • Wide 4.5V to 36V Input Operating Range (Up to 52V Load Dump)
  • Powers HB LEDs (up to six 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
  • Demonstrates Cycle-by-Cycle Current Limit and Thermal-Shutdown Features
  • Demonstrates Wide Dimming Ratio
  • Proven PCB and Thermal Design
  • Fully Assembled and Tested

Product Details

The MAX20446C evaluation kit (EV kit) demonstrates the MAX20446C, an integrated 6-channel high-brightness LED driver with boost controller for automotive displays.

The EV kit operates from a DC supply voltage between 4.5V and 36V, and the switching frequency can be either set at 2.2MHz or at 400kHz. The EV kit operates in stand-alone mode. Spread-spectrum mode is enabled by default for EMI improvement. The EV kit demonstrates phase-shifted pulse-width modulation (PWM) dimming. Dimming can be performed externally using a PWM signal applied to the DIM PCB pad. The hybrid dimming feature can also be enabled through a resistor connected between the SET pin and GND to reduce EMI. The EV kit also demonstrates short-LED, open-LED, boost output undervoltage and overvoltage, and overtemperature-fault protection.

For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the MAX20446C IC data sheet.

Applications

  • Central Information Displays
  • Infotainment Displays
  • Instrument Clusters
MAX20446CEVKIT
Evaluation Kit for the MAX20446C

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