MAX25014

PRODUCTION

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

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

Data Sheet (Rev. 0)

Product Selection Table

Part Models: 4
1ku List Price: Starting From $3.12

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Overview

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

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

Part Models: 4
1ku List Price: Starting From $3.12

Documentation

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX25014ATG/V+	24-TQFN-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25014ATG/V+T	24-TQFN-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25014ATG/VY+	24-LFCSP_SS-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX25014ATG/VY+T	24-LFCSP_SS-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

Software Development 1

MAX25014 EV Kit Software, 1.0.0

Evaluation Kits

Evaluation Kit for the MAX25014

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Features and 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

Product Details

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

Resources

MAX25014EVKIT ODB Files - Design Files
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