MAX16814

PRODUCTION

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

Data Sheet (Rev. 11) Product Selection Table
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Overview

  • 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

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.

Applications

  • Architectural, Industrial, and Ambient Lighting
  • Automotive Displays LED Backlights
  • Automotive RCL, DRL, Front Position, and Fog Lights
  • LCD TV and Desktop Display LED Backlights
MAX16814
Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller
MAX16814: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 3

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LED Drivers 2
MAX16838
PRODUCTION Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller
MAX16826
PRODUCTION Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection
MOSFET & Gate Drivers 1
MAX15054
PRODUCTION High-Side MOSFET Driver for HB LED Drivers and DC-DC Applications
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Tools & Simulations

SPICE Model 1

Evaluation Kits

MAX16814EVKIT

Evaluation Kit for the MAX16814

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Features and Benefits

  • Input Voltage from 6.5V Up to HB LED Forward Voltage
  • Demonstrates OVP (33V)
  • HB LED String Output Currents Configurable for 100mA or 150mA
  • Demonstrates UVLO (5V)
  • Demonstrates Open and Short LED Fault Protection and Detection
  • Demonstrates Cycle-by-Cycle Current Limit and Thermal-Shutdown Features
  • Demonstrates Adaptive Voltage Optimization
  • Proven PCB and Thermal Design
  • Fully Assembled and Tested

Product Details

The MAX16814 evaluation kit (EV kit) demonstrates the MAX16814 high-brightness LED (HB LED) driver, integrating a step-up DC-DC preregulator followed by 4 channels of linear current sinks. The step-up preregulator switches at 350kHz and operates as a current-mode-controlled regulator capable of providing up to 600mA for the linear circuits. Each of the 4 linear channels can operate up to 40V and provide up to 150mA per channel. The 4 channels are configurable for 100mA or 150mA HB LED output current. The IC is a 20-pin TSSOP package with an exposed pad for enhanced thermal power dissipation.

The EV kit operates from a DC supply voltage of 6.5V up to the HB LED string forward voltage. The EV kit can withstand a 40V load-dump condition. The EV kit also demonstrates the IC features such as adaptive voltage optimization, undervoltage lockout (UVLO), overvoltage protection (OVP), cycle-by-cycle current limit, thermal shutdown, and digital PWM dimming operation using a digital PWM input signal to control the brightness of the HB LEDs. The EV kit also demonstrates a reference IC design for automotive applications.

Applications

  • 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

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