MAX20444

Automotive 4-Channel 130mA Backlight Driver with Boost/SEPIC Controller and I²C Interface

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

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Not Recommended for New Designs

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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 4-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 and SWTQFN Packages

Product Details

The MAX20444 is a 4-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, while stand-alone operation is also supported.

The MAX20444 is available in a 24-pin TQFN or 24-pin side-wettable TQFN (SWTQFN) package and operates over the -40°C to +125°C temperature range.

Applications

Central Information Displays
Infotainment Displays
Instrument Clusters

Product Categories

Product

Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA). To request an NDA, click here.

Product Lifecycle Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

Evaluation Kits (1)

MAX20444EVKIT

Evaluation Kit for the MAX20444

MAX20444EVKIT

View Detailed Evaluation Kit Information

The MAX20444 evaluation kit (EV kit) demonstrates the MAX20444 integrated, 4-channel, high-brightness 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 at either 2.2MHz or 400kHz. The EV kit can be configured to operate in stand-alone mode or in I²C mode. Spread-spectrum mode (SSM) for EMI improvement is enabled by default, but it can be disabled trough a register bit. The EV kit demonstrates phase-shifted pulse-width modulation (PWM) dimming, which can be performed either externally using a PWM signal applied to the DIM PCB pad or internally by programming the desired dimming frequency and individual duty cycle using I²C. The hybrid dimming feature can also be enabled through a register bit to reduce EMI. The EV kit also demonstrates fault protection for short LED, open LED, boost output undervoltage and overvoltage, and overtemperature.

For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the MAX20444 IC data sheet.

The EV kit provides an I²C interface that can operate in conjunction with the MINIQUSB+ adapter board 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 MAX20444
Wide 4.5V to 36V Input Operating Range (Up to 52V Load Dump)
Powers HB LEDs (Up to four 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 Failsafe Operation
I²C Programmability
Dedicated GUI
Proven PCB and Thermal Design
Fully Assembled and Tested

Documentation & Resources

Technical Articles

LED Driver for Automotive Display Applications
9/24/2021
Why Functional Safety is Important for Automotive Displays
5/23/2019

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice downloads and documentation

Models for the following parts are available in LTspice:

MAX20444B

Software Development

MAX20444 EV Kit, 1.0.0

ZIP

Design Resources

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Quality And Reliability

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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.