MAX25614D
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MAX25614D

Automotive IR LED/VCSEL Driver for Driver Monitoring Systems

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Automotive Infrared LED/VCSEL Driver Simplifies Design for Automotive Driver and Occupant Monitoring Systems

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Features
  • Integration Minimizes BOM and PCB Area
    • Boost/Buck ​Maxim-Proprietary Architecture
    • Integrated 0.168Ω Switching nFET
    • Integrated pFET with Inrush Current Limit
    • Analog Control Inputs
  • Comprehensive Fault Protection
    • Boost Undervoltage/Overvoltage Protection
    • LED Current Monitoring 
    • LED Ground Short and Overcurrent Protection
    • LEDN Short-to-Battery Protection
    • LED Open Protection
    • pFET Timeout
    • Thermal Warning and Shutdown
  • EMI Mitigation
    • Spread-Spectrum Frequency Modulation
  • Automotive Ready
    • -40°C to +125°C Operating Temperature Range
    • AEC-Q100 Grade 1 Qualified
Additional Details
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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
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Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA). To request an NDA, click here.
file View Data Sheet (Rev.4)
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Part Models 2
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MAX25614D

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UPDATED 09/10/2024
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MAX25614: Automotive IR LED/VCSEL Drivers for Driver Monitoring Systems Data Sheet (Rev.4)

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2022-10-04

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Introduction to the MAX25614A, MAX25614B, MAX25614C, and MAX25614D Automotive IR LED/VCSEL Driver for Driver Monitoring Systems

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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.

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Software & Part Ecosystem

Parts Product Life Cycle Description

Step-Up (Boost) LED Drivers2
MAX25614A
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Automotive IR LED/VCSEL Driver for Driver Monitoring Systems

MAX25614B
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Automotive IR LED/VCSEL Driver for Driver Monitoring Systems

Evaluation Kits 1

MAX25614DEVKIT

Evaluation Kit for the MAX25614C/MAX25614D

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MAX25614DEVKIT

Evaluation Kit for the MAX25614C/MAX25614D

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MAX25614DEVKIT
Evaluation Kit for the MAX25614C/MAX25614D

Features and Benefits

  • Boost/Buck Maxim Proprietary Control Architecture
  • Integrated Protections for Eye Safety, PWM Pulse Width Timer, and LED Current Monitor
  • Onboard IR Emitter Load
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Product Detail

The MAX25614D evaluation kit (EV kit) provides a proven design to evaluate the MAX25614C/MAX25614D automotive infrared LED drivers. The EV kit operates from a 5V to 18V DC supply voltage.

The EV kit is configured to deliver up to 5A to a string of LEDs. The total voltage of the string can vary from 0 to 32V. The high current driver uses fixed-frequency average current mode control. The LEDs may be connected by using the on-board IR LEDs or using onboard external connection pads. The anode of the LED string should be connected to the LED1+ terminal. The cathode of the LED string should be connected to LED-. The LED current, input current, and boost voltage are all controlled through the analog inputs VSET and ICTRL. The strobe signal can be applied to the PWM input to set the IR emitter pulse duration and frequency. A fault flag is provided on the FLTB test point, indicating fault conditions such as LED short to ground or LED open.

APPLICATIONS

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

NDA PROCESS

  • To apply for the NDA, fill out the request form and agree to the Terms and Conditions.
  • Applying for an NDA does not necessarily guarantee approval or shipment of any device or software.
  • NDA is subject to approval by the Customer Service Team and will notify applicants accordingly.
  • If the NDA is approved, customers will need to register for a MyAnalog account (for existing account holders, please log in with your details) in order to access the zip file under the Software Development section (note that this will appear only for approved MyAnalog accounts).

Evaluation Kits1

MAX25614DEVKIT

Evaluation Kit for the MAX25614C/MAX25614D

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