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Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and I2C Interface

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

Product Details

Key Features

Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 42
Max. No. of LEDs 80
# LED Channels 6
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.13
PWM Dimming Freq. (kHz) (max) 2
Dimming Ratio (max) 20000
Dimming Control Digital
I2C Serial
POUT (W) 40
ICC (mA) (max) 10
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 2200
Package/Pins TQFN-CU/24
Budgetary
Price (See Notes)
2.65
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Parameters

Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 42
Max. No. of LEDs 80
# LED Channels 6
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.13
PWM Dimming Freq. (kHz) (max) 2
Dimming Ratio (max) 20000
Dimming Control Digital
I2C Serial
POUT (W) 40
ICC (mA) (max) 10
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 2200
Package/Pins TQFN-CU/24
Budgetary
Price (See Notes)
2.65

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
    • 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 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 I2C-controlled 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.

Comprehensive diagnostic information is also available through the I2C interface.

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

Design Solution: Overcome the Design Challenges of New Automotive Display Backlights ›

Simplified Block Diagram

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 .