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

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

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Wide-Voltage-Range Operation
    • Operates Down to 4V 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 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

Applications/Uses

  • Central Information Displays
  • Infotainment Displays
  • Instrument Clusters

Description

The MAX20446 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 direct automotive load-dump events.

The internal current-mode switching DC-DC controller supports boost or SEPIC topologies and operates in the frequency range 400kHz to 2.2MHz. 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. 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 to +125°C temperature range.

Simplified Block Diagram

MAX20446C: Simplified Block Diagram MAX20446C: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .