Features and Benefits
- 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
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.
- 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
Product Lifecycle Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Documentation & Resources
MAX16831 Reliability Data1/12/202333K
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.
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