MAX25614B

Automotive IR LED/VCSEL Driver for Driver Monitoring Systems

ASIL-B, Automotive Infrared LED/VCSEL Driver Simplifies Design for Automotive Driver and Occupant Monitoring Systems

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Overview

Features and Benefits
Product Details

Features and Benefits

Integration Minimizes BOM and PCB Area
- Integrated Switching nFET
- Integrated pFET with Inrush Current Limit
- I²C Programming Controls
Comprehensive Fault Protection Including Eye Safety
- LED Current Monitoring, Overcurrent Protection
- LED Short-to-Ground/Battery Protection
- LED Open Protection
- Boost Under/Overvoltage Protection
- Thermal Warning and Shutdown
EMI Mitigation
- Spread-Spectrum Frequency Modulation
- Programmable LED Current Slew Rate
Automotive Ready
- -40°C to +125°C Operating Temperature Range
- AEC-Q100 Grade 1 and ASIL B Compliant

Product Details

The MAX25614 is a high-current IR LED/VCSEL driver for automotive driver monitoring systems (DMS). This IC can drive IR LED/VCSEL strings of up to 35V from a 4.5V to 36V input supply. The MAX25614 can drive up to 10A peak current to the IR emitter. It is designed for applications where the IR emitter is pulsed on and off, typically at 60Hz or the shutter speed of the corresponding image sensor. The MAX25614A/MAX25614B use fixed-frequency, average current-mode control with programmable switching frequency options of 420kHz, 1MHz, 1.6MHz, and 2.1MHz. Both an inrush current-limiting pFET and a low-side switching nFET are integrated.

The MAX25614A/MAX25614B incorporate an I²C serial interface for communication with an external microcontroller. I²C programming options include: LED current amplitude, LED current slew rate, boost converter output voltage, boost converter input current, switching frequency, maximum LED current, and maximum LED on-time. Additionally, the MAX25614A/MAX25614B provide fault and diagnostic information through the I²C interface. Analog-controlled variants are available as well, and are described in the MAX25614C/MAX25614D data sheet.;

A dedicated current-monitoring circuit is integrated to provide LED current information to the microcontroller. The MAX25614 has an open-drain fault output that asserts low in case of open LED, LED overcurrent, excessive LED on-time, LEDN short to battery, boost UV/OV, inrush current-limiting pFET timeout, or thermal warning/shutdown. The MAX25614 is available in a 28-pin, side-wettable TQFN package with exposed pad and is specified for operation over the -40°C to +125°C automotive temperature range.

Applications

Automotive Driver Monitoring System (DMS)
Automotive Occupant Monitoring System (OMS)
Night Vision
Optical Inspection/Machine Vision

Product Categories

Power Management
- Step-Up (Boost) LED Drivers

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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)

MAX25614EVKIT

Evaluation Kit for the MAX25614A/MAX25614B/MAX25614C/MAX25614D

MAX25614EVKIT

View Detailed Evaluation Kit Information

The MAX25614 evaluation kit (EV kit) provides a proven design to evaluate the MAX25614A/MAX25614B/MAX25614C/MAX25614D automotive infrared LED Driver. The EV kit has an I²C interface with MAX32625PICO microcontroller that enables programming parameters such as LED current, LED slew rate, switching frequency, etc. This also helps with fault monitoring and signal sensing. The EV kit operates from a 5V to 18V DC supply voltage. It is configured to deliver up to 5A to one or two strings of LEDs. The total voltage of the string can vary from 0V to 32V. The high-current driver uses fixed-frequency average current-mode control. The LEDs can be connected by using the on-board IR LEDs or using on-board external connection pads. The anode of the LED string should be connected to the LED1+ terminal. For two string applications, connect one string anode to LED1+ and connect the second-string anode to LED2+. The cathode of the LED string(s) should be connected to LED- for both one string and two string applications.

Applications

Automotive Driver Monitoring System (DMS)
Automotive Occupant Monitoring System (OMS)
Night Vision
Optical Inspection/Machine Vision

Features & Benefits

Boost/Buck Maxim Proprietary Control Architecture
Integrated Protections for Eye Safety, PWM Pulse width Timer, and LED Current Monitor
PICO Board and Graphical User Interface for I²C Control, Diagnostics, and PWM Generator
On-Board IR Emitter Load

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
MAX25614BATI/VY+	Material Declaration	Reliability Data	28-LFCSP_SS-5X5X0.75	Ultra Librarian SamacSys
MAX25614BATI/VY+T	Material Declaration	Reliability Data	28-LFCSP_SS-5X5X0.75	Ultra Librarian SamacSys
Wafer Fabrication Data

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Evaluation Boards

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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.