Top

High-Voltage, High-Power LED Driver with Analog and PWM Dimming Control

High-Integration, High-Power LED Driver Simplifies Design, Allows for Wide-Range Dimming Control, and Minimizes EMI

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Key Features

  • Wide Input Range: 6V to 76V with Cold-Start Operation to 5.5V
  • Integrated Differential LED Current-Sense Amplifier
  • Floating Dimming Driver Capable of Driving an n-Channel MOSFET
  • 5% LED Current Accuracy
  • 200Hz On-Board Ramp Syncs to External PWM Dimming Signal
  • Programmable Switching Frequency (125kHz to 600kHz) and Synchronization
  • Output Overvoltage Load Dump, LED Short, Overtemperature Protection
  • Low 107mV LED Current Sense for High Efficiency
  • Enable/Shutdown Input with Shutdown Current Below 45µA

Applications/Uses

  • Automotive Exterior Lighting:
  •   Daytime Running Lights (DRL)
  •   Fog Light and Adaptive Front Light Assemblies
  •   High-Beam/Low-Beam/Signal Lights
  •   Rear Combination Lights (RCL)
  • Emergency Lighting
  • Industrial and Architectural Lighting
  • Navigation and Marine Indicators
  • Projectors with RGB LED Light Sources

Description

The MAX16831 is a current-mode, high-brightness LED (HB LED) driver designed to control two external n-channel MOSFETs for the single-string LED current regulation. The MAX16831 integrates all the building blocks necessary to implement fixed-frequency HB LED drivers with wide-range dimming control. The MAX16831 is configurable to operate as a step-down (buck), step-up (boost), or step-up/-down (buck-boost) current regulator.

Current-mode control with leading-edge blanking simplifies control-loop design. Internal slope compensation stabilizes the current loop when operating at duty cycles above 50%. The MAX16831 operates over a wide input voltage range and is capable of withstanding automotive load-dump events. Multiple MAX16831s can be synchronized to each other or to an external clock. The MAX16831 includes a floating dimming driver for brightness control with an external n-channel MOSFET in series with the LED string.

HB LED drivers using the MAX16831 achieve efficiencies of over 90% in automotive applications. The MAX16831 also includes a 1.4A source and 2.5A sink gate driver for driving switching MOSFETs in high-power LED driver applications, such as front light assemblies. The dimming control allows for wide PWM dimming at frequencies up to 2kHz. Higher dimming ratios of up to 1000:1 are achievable at lower dimming frequencies.

The MAX16831 is available in a 32-pin thin QFN package with exposed pad and operates over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX16831: Typical Operating Circuit MAX16831: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.