MAX16814

Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller

Multistring Driver Provides Highest Efficiency and Complete Fault Protection with the Lowest External Component Count


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Description

The MAX16814 high-efficiency, high-brightness LED (HB LED) driver provides up to four integrated LED current-sink channels. An integrated current-mode switching DC-DC controller drives a DC-DC converter that provides the necessary voltage to multiple strings of HB LEDs. The MAX16814 accepts a wide 4.75V to 40V input voltage range and withstands direct automotive load-dump events. The wide input range allows powering HB LEDs for small to medium-sized LCD displays in automotive and general lighting applications.

An internal current-mode switching DC-DC controller supports the boost, coupled-inductor boost-buck, or SEPIC topologies and operates in an adjustable frequency range between 200kHz and 2MHz. It can also be used for single-inductor boost-buck topology in conjunction with the MAX15054 and an additional MOSFET. The current-mode control with programmable slope compensation provides fast response and simplifies loop compensation. The MAX16814 also features an adaptive output-voltage control scheme that minimizes the power dissipation in the LED current-sink paths.

The MAX16814 consists of four identical linear current source channels to drive four strings of HB LEDs. The channel current is adjustable from 20mA to 150mA with an accuracy of ±3% using an external resistor. The external resistor sets all 4-channel currents to the same value. The device allows connecting multiple channels in parallel to achieve higher current per LED string. The MAX16814 also features pulsed dimming control, on all four channels through a logic input (DIM). In addition, the MAX16814A_ _ and MAX16814U_ _ include a unique feature that allows a very short minimum pulse width as low as 1µs.

The MAX16814 includes an output overvoltage, open-LED detection and protection, programmable shorted LED detection and protection, and overtemperature protection. The device operates over the -40°C to +125°C automotive temperature range. The MAX16814 is available in 6.5mm x 4.4mm, 20-pin TSSOP, 4mm x 4mm, 20-pin TQFN and QFND packages.

MAX16814: Typical Operating Circuit MAX16814: Typical Operating Circuit Enlarge+

Key Features

  • Cost-Effective 4-Channel Linear LED Current Sinks for Wide Range of LED Lighting Applications
    • Drives One to Four LED Strings
    • 4.75V to 40V Input Voltage Range
    • Full-Scale LED Current Adjustable from 20mA to 150mA
    • 5000:1 PWM Dimming at 200Hz
    • Less than 40µA Shutdown Current
  • Minimal Component Count Saves Cost and Space
    • Internal MOSFET for Each Channel
    • Internal Current-Mode Switching DC-DC Controller Supporting Boost, Coupled-Inductor Boost-Buck,or SEPIC Topologies
    • 200kHz to 2MHz Programmable Switching Frequency for Optimizing Size vs. Efficiency
    • External Switching-Frequency Synchronization
  • Protection Features and Wide Operating Temperature Range Improves Reliability
    • Open-Drain Fault-Indicator Output
    • Open-LED and LED-Short Detection and Protection
    • Overtemperature Protection
    • Available in Thermally Enhanced 20-Pin TQFN, QFND, and TSSOP Packages
    • Operation Over -40°C to +125°C Temperature Range

Applications/Uses

  • Architectural, Industrial, and Ambient Lighting
  • Automotive Displays LED Backlights
  • Automotive RCL, DRL, Front Position, and Fog Lights
  • LCD TV and Desktop Display LED Backlights

MAX16814EVKIT: Evaluation Kit for the MAX16814
Product Reliability Reports: MAX16814.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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