MAX25614B

PRODUCTION

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

Data Sheet (Rev. 4) Product Selection Table
Viewing:

Overview

  • 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

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 MAX25614 uses 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 MAX25614 incorporates 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 MAX25614 provides 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
MAX25614B
Automotive IR LED/VCSEL Driver for Driver Monitoring Systems
MAX25614AB SimpAppCirc
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Request an NDA

Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA).

Request an NDA
Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Evaluation Kits

MAX25614EVKIT

Evaluation Kit for the MAX25614A/MAX25614B/MAX25614C/MAX25614D

Buy Now View Details

Features and 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

Product Details

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
MAX25614EVKIT
Evaluation Kit for the MAX25614A/MAX25614B/MAX25614C/MAX25614D

Latest Discussions

No discussions on MAX25614B yet. Have something to say?

Start a Discussion on EngineerZone®

Recently Viewed