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Programmable Switch-Mode LED Driver with Analog-Controlled PWM Dimming

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

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • EEPROM-Programmable LED Current Binning
  • Wide Input Range: 5.9V to 76V with Cold Start Operation to 5.4V
  • Integrated Floating Differential LED Current-Sense Amplifier
  • Floating Dimming Driver Capable of Driving an n-Channel MOSFET
  • 5% or Better LED Current Accuracy
  • Multiple Topologies: Buck, Boost, Buck-Boost, SEPIC
  • Resistor-Programmable Switching Frequency (125kHz to 500kHz) and Synchronization Capability
  • 200Hz On-Board Ramp Allows Analog-Controlled PWM Dimming and External PWM Dimming
  • Output Overvoltage, Overcurrent, and LED Short Protection
  • Enable/Shutdown Input with Shutdown Current Below 45µA

Applications/Uses

  • General Illumination
  • Navigation and Marine Indicators
  • Neon Replacement, Emergency Lighting
  • Signage and Beacons

Description

The MAX16816 is a current-mode, high-brightness LED (HB LED) driver designed to control two external n-channel MOSFETs for single-string LED current regulation. The MAX16816 integrates all the building blocks necessary to implement fixed-frequency HB LED drivers with wide-range dimming control and EEPROM-programmable LED current binning with a factor of up to 1.6. This device is configurable to operate as a stepdown (buck), step-up (boost), or step-up/step-down (buck-boost) current regulator.

Current-mode control with adjustable leading-edge blanking simplifies control-loop design. Adjustable slope compensation stabilizes the current loop when operating at duty cycles above 50%. The MAX16816 operates over a wide input voltage range and is capable of withstanding load-dump events. Multiple MAX16816 devices can be synchronized to each other or to an external clock. The MAX16816 includes a floating dimming driver for brightness control with an external n-channel MOSFET in series with the LED string.

HB LEDs using the MAX16816 can achieve efficiencies of over 90%. The MAX16816 also includes a 1.4A source and 2A sink gate driver for driving switching MOSFETs in high-power LED driver applications, such as front light assemblies. Dimming control allows for wide PWM dimming range at frequencies up to 5kHz. Higher dimming ratios (up to 1000:1) are achievable at lower dimming frequencies.

The MAX16816 provides user-programmable features through on-chip nonvolatile EEPROM registers. Adjustable features include a programmable soft-start, LED current (binning), external MOSFET gate driver supply voltage, slope compensation, leading-edge blanking time, and disabling/enabling of the RT oscillator.

The MAX16816 is available in a 32-pin TQFN package with exposed pad and operates over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX16816: Typical Operating Circuit MAX16816: 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.