MAX20446B

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

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Overview

Features and Benefits
Product Details

Features and Benefits

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

Product Details

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.

Applications

Central Information Displays
Infotainment Displays
Instrument Clusters

Product Categories

Power Management
- Step-Up (Boost) LED Drivers

Markets and Technologies

Automotive (1)
- Cluster Display and Rear Seat Entertainment

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

MAX20446BEVKIT

Evaluation Kit for the MAX20446B

MAX20446BEVKIT

View Detailed Evaluation Kit Information

The MAX20446B evaluation kit (EV kit) demonstrates the MAX20446B integrated 6-channel high-brightness (HB) 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 either at 2.2MHz or at 400kHz. The EV kit operates in I²C mode only. Spread-spectrum mode (SSM) is enabled by default for electromagnetic interference (EMI) improvement but can be disabled by acting on a register bit. 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 or internally by programming the desired dimming frequency and individual duty cycle through I²C. The hybrid dimming feature can be enabled through a register bit to reduce EMI. The EV kit also demonstrates short-LED, open-LED, boost output undervoltage, as well as 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 MAX20446B IC data sheet.

The EV kit provides an I²C nterface that can operate in conjunction with the Maxim command module (MINIQUSB+) 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

Features & Benefits

Demonstrates Robustness of MAX20446B
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 Option
Demonstrates Cycle-by-Cycle Current Limit and Thermal-Shutdown Features
Demonstrates Wide Dimming Ratio
Demonstrates Fail-Safe Operation
I²C Programmability
Dedicated GUI
Proven PCB Layout and Thermal Design
Fully Assembled and Tested

Resources

MAX20446BEVKIT ODB Files - Design Files

TGZ

1.02M

Documentation & Resources

Data Sheets

MAX20446B: Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and I²C Interface Data Sheet (Rev. 1)
2/17/2021

PDF

1M

Reliability Data

MAX20446B Reliability Data
10/10/2022

PDF

215K

Videos

Introduction to the MAX20446B Automotive I2C 6-Channel 130mA Backlight Driver with Boost/SEPIC Controller
11/29/2022

Technical Articles

LED Driver for Automotive Display Applications
9/24/2021

Tools & Simulations

Software Development

MAX20446B/C EV Kit Software, 1.0.0

ZIP

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.