MAX16834

PRODUCTION

High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver

Flexible HB LED Driver Supports Green Technology for LED Lighting, Display Backlighting, and Display Projection

Data Sheet (Rev. 5) Product Selection Table
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Overview

  • Integration Minimizes BOM for High-Brightness LED Driver with a Wide Dimming Range Saving Space and Cost
    • Constant-Frequency, Peak Current-Mode Control with Programmable Slope Compensation
    • Integrated PWM Dimming MOSFET Driver
    • 3000:1 PWM Dimming/Analog Dimming
    • Integrated High-Side Current-Sense Amplifier for LED Current Sense in Boost-Buck Converter
    • Internal 7V Low-Dropout Regulator
  • Simple Optimization for Efficiency, Board Space and Input Operating Range
    • Supports Boost, Buck-Boost, SEPIC, and High-Side Buck Topologies
    • 100kHz to 1MHz Programmable High-Frequency Operation
    • External Clock Synchronization Input
    • Wide Input Operating Voltage Range (4.75V to 28V)
    • Works for Input Voltage > 28V with External Voltage Clamp on VIN for Boost Converter
    • 20-Pin TQFN-EP and TSSOP-EP Packages
  • Protection Features Increase System Reliability
    • Programmable UVLO
    • Programmable True Differential Overvoltage Protection
    • Fault Output (FLT) for Overvoltage, Overcurrent, and Thermal-Warning Faults

The MAX16834 is a current-mode high-brightness LED (HB LED) driver for boost, boost-buck, SEPIC, and high-side buck topologies. In addition to driving an n-channel power MOSFET switch controlled by the switching controller, it also drives an n-channel PWM dimming switch to achieve LED PWM dimming. The MAX16834 integrates all the building blocks necessary to implement a fixed-frequency HB LED driver with wide-range dimming control. The MAX16834 features constant-frequency peak current-mode control with programmable slope compensation to control the duty cycle of the PWM controller.

A dimming driver designed to drive an external n-channel MOSFET in series with the LED string provides wide-range dimming control up to 20kHz. In addition to PWM dimming, the MAX16834 provides analog dimming using a DC input at REFI. The programmable switching frequency (100kHz to 1MHz) allows design optimization for efficiency and board space reduction. A single resistor from RT/SYNC to ground sets the switching frequency from 100kHz to 1MHz while an external clock signal at RT/SYNC disables the internal oscillator and allows the MAX16834 to synchronize to an external clock. The MAX16834's integrated high-side current-sense amplifier eliminates the need for a separate high-side LED current-sense amplifier in boost-buck applications.

The MAX16834 operates over a wide supply range of 4.75V to 28V and includes a 3A sink/source gate driver for driving a power MOSFET in high-power LED driver applications. It can also operate at input voltages greater than 28V in boost configuration with an external voltage clamp. The MAX16834 is also suitable for DC-DC converter applications such as boost or buck-boost. Additional features include external enable/disable input, an on-chip oscillator, fault indicator output (active-low FLT) for LED open/short or overtemperature conditions, and an overvoltage protection sense input (OVP+) for true overvoltage protection.

The MAX16834 is available in a thermally enhanced 4mm x 4mm, 20-pin TQFN-EP package and in a thermally enhanced 20-pin TSSOP-EP package and is specified over the automotive -40°C to +125°C temperature range.

Applications

  • Architectural and Decorative Lighting (MR16, MR111)
  • Automotive Rear and Front Lighting
  • DC-DC Boost/Boost-Buck Converters
  • Projection System RGB LED Light Sources
  • Single-String LED LCD Backlighting
  • Spot and Ambient Lights
MAX16834
High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver
MAX16834: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 8

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LED Drivers 4
MAX16826
PRODUCTION Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection
MAX16820
PRODUCTION 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming
MAX16832
PRODUCTION 2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense
MAX16831
NOT RECOMMENDED FOR NEW DESIGNS High-Voltage, High-Power LED Driver with Analog and PWM Dimming Control
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Tools & Simulations

SPICE Model 1

Evaluation Kits

MAX16834EVKIT

Evaluation Kit for the MAX16834

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Features and Benefits

  • 7V to 28V Wide Supply Voltage Range
  • Configured for Boost Operation
  • Configurable for Buck-Boost Operation
  • 1A Output Current
  • Analog Linear Dimming Control
  • PWM Dimming Control
  • Open/Short-Circuit LED Fault Indicator (Active-Low FLT)
  • Demonstrates Output Overvoltage Protection
  • Optional Load Dump Circuit
  • Fully Assembled and Tested

Product Details

The MAX16834 evaluation (EV kit) is a fully assembled and tested surface-mount PCB designed to evaluate the MAX16834 pulse-width modulated (PWM) HB LED driver controller in a step-up (boost) configuration and optional step-up/step-down (buck-boost) operation.

The MAX16834 EV kit operates from a DC supply voltage of 7V to 28V and requires up to 5A. The MAX16834 EV kit circuit is configured to deliver up to 1A of current into series LEDs with a maximum forward voltage of 28V.

The MAX16834 EV kit features two different types of dimming control using either an analog linear input voltage or digital PWM input signal to control the LED brightness. This EV kit has an undervoltage lockout (UVLO) feature that disables the EV kit and overvoltage protection that protects the circuit under no-load conditions. The EV kit also features a active-low FLT PCB pad to monitor for open or short-circuit LED conditions at the LED+ and LED- PCB pads. The MAX16834 EV kit is a fully assembled and tested surface-mount board.

Applications

  • Architectural and Decorative Lighting (MR16, MR111)
  • Automotive Rear and Front Lighting
  • DC-DC Boost/Buck-Boost Converters
  • Projection System RGB LED Light Sources
  • Single-String LED LCD Backlighting
  • Spot and Ambient Lights
MAX16834EVKIT
Evaluation Kit for the MAX16834

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