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1.5MHz, 30A High-Efficiency LED Driver with Rapid LED Current Pulsing

First High-Efficiency, High-Power LED Driver that Enables Rapid Transient Response, Accurate LED Current Regulation, PWM and Analog Dimming

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Flexible Architecture Supports a Range of LED LIghting Applications with Minimal Component Count
    • Up to 30A Output Current
    • 4.75V to 5.5V or 7V to 28V Input Voltage Range
    • Average-Current-Mode Control
    • True-Differential Remote-Sense Input
  • Frequency Management Reduces EMI and Interference with Other System Clocks
    • Programmable Switching Frequency or External Synchronization from 125kHz to 1.5MHz
    • Clock Output for 180° Out-of-Phase Operation
  • Integrated Protection Features and Thermally Enhanced Package Improve System Reliability
    • Output Overvoltage and Hiccup-Mode Overcurrent Protection
    • Thermal Shutdown
    • Thermally Enhanced 28-Pin TQFN Package

Applications/Uses

  • Front Projectors/Rear Projection TVs
  • LCD TVs and Display Backlight
  • Portable and Pocket Projectors

Description

The MAX16818 pulse-width modulation (PWM) LED driver controller provides high-output-current capability in a compact package with a minimum number of external components. The MAX16818 is suitable for use in synchronous and nonsynchronous step-down (buck) topologies, as well as in boost, buck-boost, SEPIC, and Cuk LED drivers. The MAX16818 is the first LED driver controller that enables Maxim's technology for fast LED current transients of up to 20A/µs and 30kHz dimming frequency.

This device utilizes average-current-mode control that enables optimal use of MOSFETs with optimal charge and on-resistance characteristics. This results in the minimized need for external heatsinking even when delivering up to 30A of LED current. True differential sensing enables accurate control of the LED current. A wide dimming range is easily implemented to accommodate an external PWM signal. An internal regulator enables operation over a wide input voltage range: 4.75V to 5.5V or 7V to 28V and above with a simple external biasing device. The wide switching frequency range, up to 1.5MHz, allows for the use of small inductors and capacitors.

The MAX16818 features a clock output with 180° phase delay to control a second out-of-phase LED driver to reduce input and output filter capacitors size or to minimize ripple currents. The MAX16818 offers programmable hiccup, overvoltage, and overtemperature protection.

The MAX16818ETE+ is rated for the extended temperature range (-40°C to +85°C) and the MAX16818ATE+ is rated for the automotive temperature range (-40°C to +125°C). This LED driver controller is available in a lead-free, 0.8mm high, 5mm x 5mm 28-pin TQFN package with an exposed pad.

Simplified Block Diagram

MAX16818: Simplified Diagram MAX16818: Simplified Diagram 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.