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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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主要特征

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主要特征

  • 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 Qualified

应用/用途

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

描述

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 instantaneous and average 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 +125°C automotive temperature range.

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在Maxim的知识库中搜索技术问题的答案

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