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High-Voltage, 350mA, High-Brightness LED Driver with Analog and PWM Dimming Control

350mA High-Brightness LED Driver with On-Board 200Hz Ramp Generator Eliminates the Need for µC's PWM Dimming Signal, Simplifies LED Lighting Applications, Minimizes External Part Counts, and Saves Cost and Space

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Flexible Dimming Control Simplifies Lighting System Design
    • Analog or PWM Control Signal for PWM and Theater Dimming
    • 200Hz On-Board Ramp Generator
    • High-Voltage (Up to 40V) DIM Pin
    • Additional +5V On-Board Regulator with 2mA Capability
  • External Synchronization and Pulse Shaping Reduce Radio Interference
    • Wave-Shaped Edges Minimize EMI During PWM Dimming
    • Syncs to External PWM Signal (Up to 2kHz)
  • Powers High-Power, High-Brightness LEDs
    • 35mA to 350mA Adjustable LED Current
    • 3% LED Current Accuracy
    • Differential LED Current Sense
  • Enables High-Efficiency Designs to Minimize Heat Dissipation
    • Integrated Pass Element with Low-Dropout Voltage (0.5V typ)
    • 200mV Current-Sense Reference Reduces Power Losses
  • Thermal Shutdown and Output Short-Circuit Protection Provide Additional Safety
    • 5.5V to 40V Operating Range
    • -40°C to +125°C Operating Temperature Range

Applications/Uses

  • Navigation and Marine Indicators
  • Signage, Canopies, and Beacons
  • Warning Lights for Emergency Vehicles

Description

The MAX16804 current regulator operates from a 5.5V to 40V input voltage range and delivers 35mA to 350mA to one or more strings of high-brightness LEDs (HB LEDs). The output current of the MAX16804 is set by using an external current-sense resistor in series with the LEDs. A dual-mode DIM pin and on-board 200Hz ramp generator allow PWM dimming with an analog or PWM input signal. The analog control signal at dimming input DIM allows for a theater-dimming effect to be implemented. Fast turn-on and turn-off times ensure a wide-range PWM operation, while wave-shaping circuitry minimizes EMI. The differential current-sense input increases LED current accuracy and noise immunity. The MAX16804 is well suited for applications requiring high-voltage input and is able to withstand load-dump events up to 45V. An on-board pass element minimizes external components while providing 3% output-current accuracy. Additional features include a 5V regulated output and short-circuit and thermal protection.

The MAX16804 is available in a thermally enhanced, 5mm x 5mm, 20-pin TQFN package and is specified over the automotive -40°C to +125°C temperature range.

Simplified Block Diagram

MAX16804: Simplified Diagrams MAX16804: Simplified Diagrams 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.