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MAX16831
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
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Status
All versions are Not Recommended for New Designs. See Ordering Information for recommended replacements.
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.
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Data Sheet
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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
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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
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Diagram
Typical Operating Circuit
Product Guides
Reliability Reports
Software/Models
Ordering Information
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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More Information
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Information Index
Document Ref.: 19-0809
Rev 1;
2010-02-12
This page last modified: 2010-04-29
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