MAX25014

Automotive Low Input Voltage I²C 4-Channel 150mA Backlight Driver

4-Channel 150mA I²C LED Driver with Low Operating Voltage

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Overview

Features and Benefits
Product Details

Features and Benefits

Wide Voltage-Range Operation
- Operates Down to 2.5V Supply After Startup
- Survives Load Dumps Up to 40V
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
- nMOS Input Protection Switch
Multiple Diagnostic Features
- LED-Current Measurement
- Boost Output Voltage Measurement
- LED Open/Short Detection and Protection
- Boost Output Undervoltage and Overvoltage
Versatile Dimming Scheme Allows Hybrid or PWM-Only Dimming Using DIM Input or I²C
- Dimming Ratio > 10,000:1 Using Hybrid Dimming
- 10,000:1 Dimming Ratio at 200Hz Using PWM Dimming
Compact (4mm x 4mm) 24-Pin TQFN and SWTQFN Packages

Product Details

The MAX25014 is a 4-channel backlight driver IC with boost controller for automotive displays. The integrated current outputs can sink up to 150mA LED current each. The device accepts a wide 2.5V to 36V input voltage range and withstands automotive load-dump events.

The internal current-mode switching DC-DC controller supports boost or SEPIC topologies and operates in the 400kHz to 2.2MHz frequency range. Integrated spread spectrum helps reduce EMI. An adaptive output-voltage-control scheme minimizes power dissipation in the LED current-sink paths.

Control is included for an external nMOSFET series switch to reduce quiescent current when the backlight is off and to disconnect the boost converter in the case of a fault.

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.

The MAX25014 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

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)

MAX25014EVKIT

Evaluation Kit for the MAX25014

MAX25014EVKIT

View Detailed Evaluation Kit Information

The MAX25014 evaluation kit (EV kit) demonstrates the MAX25014, 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 2.5V and 36V and the switching frequency can be either set at 2.2MHz or at 400kHz. The EV kit can only be configured to operate in I²C mode. Spread-spectrum mode (SSM) is enabled by default for EMI improvement, but it can be disabled by acting on a register bit. The EV kit demonstrates phase-shifted pulse-width modulation (PWM) dimming. Dimming 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 via I²C. The hybrid dimming feature can also be enabled through a register bit to reduce EMI. The EV kit also demonstrates short-LED, open-LED, Boost output Undervoltage and Overvoltage, and overtemperature-fault protection. LED current mea- surement and boost output voltage measurement are also demonstrated.

For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the MAX25014 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.

*Note: To be ordered separately.

Applications

Central Information Displays
Infotainment Displays
Instrument Clusters

Features & Benefits

Demonstrates Robustness of MAX25014
Wide 2.5V to 36V Input Operating Range (Up to 40V 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 Fail-Safe Operation
I²C Programmability
Dedicated GUI
Proven PCB and Thermal Design
Fully Assembled and Tested

Resources

MAX25014EVKIT ODB Files - Design Files

ZIP

1.13 M

Documentation & Resources

Data Sheet

MAX25014: Automotive Low Input Voltage I²C 4-Channel 150mA Backlight Driver Data Sheet (Rev. 0)
7/27/2020
PDF

Video

Introduction to the MAX25014 Automotive Low Input Voltage I2C 4-Channel 150mA Backlight Driver
11/30/2022

Design Note

Low input voltage operation of an LED backlight driving system using MAX25014
9/21/2020

Technical Article

LED Driver for Automotive Display Applications
9/24/2021

Tools & Simulations

Software Development

MAX25014 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.View our quality and reliability program and certifications for more information.

Part Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
MAX25014ATG/V+	Material Declaration	Reliability Data	24-TQFN-4X4X0.75	Ultra Librarian SamacSys
MAX25014ATG/V+T	Material Declaration	Reliability Data	24-TQFN-4X4X0.75	Ultra Librarian SamacSys
MAX25014ATG/VY+	Material Declaration	Reliability Data	24-LFCSP_SS-4X4X0.75	Ultra Librarian SamacSys
MAX25014ATG/VY+T	Material Declaration	Reliability Data	24-LFCSP_SS-4X4X0.75	Ultra Librarian SamacSys
Wafer Fabrication Data

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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.