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


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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
Part NumberRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)
PWM Dimming Freq.
(kHz)
Dimming RatioDimming ControlPOUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Oper. Freq.
(kHz)
Package/PinsBudgetary
Price
maxmaxmaxminmaxmaxmaxSee Notes
MAX16834 Inductor Based401Series10203000
Analog
PWM
1004.752862501000
QFND/20
TQFN/20
TSSOP/20
$1.91 @1k
See All LED Drivers (77)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX16834EVKIT: Evaluation Kit for the MAX16834
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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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