MAX20446

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

6-Channel 120mA LED Driver Provides Full Diagnostics and Hybrid Dimming thru I2C


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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 via the I2C interface.

The MAX20446 is available in a TQFN package and operates in the -40°C to 125°C temperature range.

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

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
Part NumberRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)
PWM Dimming Freq.
(kHz)
Dimming RatioDimming ControlPOUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Oper. Freq.
(kHz)
Package/PinsBudgetary
Price
maxmaxmaxminmaxmaxmaxSee Notes
MAX20446 Inductor Based446Series-Parallel0.1220020000
Analog
I2C Serial
PWM
324.5361052
500
700
750
1000
1200
1500
2000
2100
2200
TQFN-CU/24
$2.85 @1k
See All LED Drivers (81)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX20446EVKIT: Evaluation Kit for the MAX20446

Technical Documents

App Note 6632 How to Design an Automotive TFT Display System

Quality and Environmental Data

Request Reliability Report for: MAX20446 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

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


Software
MAX20446 EV Kit  
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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