MAX16834

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


Please check latest availability status for a specific part variant.

Description

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.
MAX16834: Typical Operating Circuit MAX16834: Typical Operating Circuit Enlarge+

Key Features

  • 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

Applications/Uses

  • 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

MAX16834EVKIT: Evaluation Kit for the MAX16834
Product Reliability Reports: MAX16834.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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