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Maxim > Products > [Automotive] 
MAX16821, MAX16821A, MAX16821B, MAX16821C
High-Power Synchronous HB LED Drivers with Rapid Current Pulsing

1.5MHz, 30A Synchronous LED Driver Ensures High Efficiency and Rapid Current Pulsing


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 288kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX16821A/MAX16821B/MAX16821C pulse-width-modulation (PWM) LED driver controllers provide high output-current capability in a compact package with a minimum number of external components. The MAX16821A/MAX16821B/MAX16821C are suitable for use in synchronous and nonsynchronous step-down (buck), boost, buck-boost, SEPIC, and Cuk LED drivers. A logic input (MODE) allows the devices to switch between synchronous buck and boost modes of operation. These devices are the first high-power drivers designed specifically to accommodate common-anode HB LEDs.

The ICs offer average current-mode control that enable the use of MOSFETs with optimal charge and on-resistance figure of merit, thus minimizing the need for external heatsinking even when delivering up to 30A of LED current.

The differential sensing scheme provides accurate control of the LED current. The ICs operate from a 4.75V to 5.5V supply range with the internal regulator disabled (VCC connected to IN). These devices operate from a 7V to 28V input supply voltage with the internal regulator enabled.

The MAX16821A/MAX16821B/MAX16821C feature a clock output with 180° phase delay to control a second out-of-phase LED driver to reduce input and output filter capacitor size and to minimize ripple currents. The wide switching frequency range (125kHz to 1.5MHz) allows the use of small inductors and capacitors.

Additional features include programmable overvoltage protection and an output enable function.

An evaluation kit is available:  MAX16821BEVKIT  

Key Features   Applications/Uses
  • Up to 30A Output Current
  • True-Differential Remote Output Sensing
  • Average Current-Mode Control
  • 4.75V to 5.5V or 7V to 28V Input-Voltage Range
  • 0.1V/0.03V LED Current-Sense Options Maximize Efficiency (MAX16821B/MAX16821C)
  • Thermal Shutdown
  • Nonlatching Output Overvoltage Protection
  • Low-Side Buck Mode with or without Synchronous Rectification
  • High-Side Buck and Low-Side Boost Mode with or without Synchronous Rectification
  • 125kHz to 1.5MHz Programmable/Synchronizable Switching Frequency
  • Integrated 4A Gate Drivers
  • Clock Output for 180° Out-of-Phase Operation for Second Driver
  • -40°C to +125°C Operating Temperature Range

 
  		• Automotive Emergency Lighting and Signage
  		• Automotive Exterior Lighting
  		• Front Projectors/Rear Projection TVs
  		• LCD TVs and Display Backlight
  		• Portable and Pocket Projectors

    Key Specifications:  High Brightness LED Drivers
    Part Number Topology VIN
    (V)    		 VIN
    (V)    		 Extended VIN with External Bias LED Channels ILED per Channel
    (A)    		 LED String Volt. Internal Pwr. MOSFETs Freq. PWM Dimming Freq.
    (kHz)    		 PWM Dimming Ratio EV Kit Price
    min max max max max max See Notes
    MAX16821 
    Boost
    Buck
    Buck-Boost
    SEPIC
    		 4.75 28 Yes
    1
    1
    		 30 Set externally No 125kHz to 1.5MHz 10 1:1000 Yes $1.82 @1k
    See All High Brightness LED Drivers (26)

    Diagram
    MAX16821, MAX16821A, MAX16821B, MAX16821C: Simplified Diagram
    Simplified Diagram

    Application Notes
  		• Application Note 4369: 6A RGB LED Driver Reference Design for a Portable Projector - MAX16821

    Evaluation Kits
  		• MAX16821BEVKIT

    Design Guides
  		• Flat-Panel Display (PDF)
  		• Automotive (PDF)

    Reliability Reports
  		• Reliability Report: MAX16821.pdf
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-6 of 6

    MAX16821A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX16821AATI+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX16821AATI+  
    		Active TQFN;28 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0028 (PDF)
    Use pkgcode/variation: T2855+8*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX16821B Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX16821BATI+  
    		Active TQFN;28 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0028 (PDF)
    Use pkgcode/variation: T2855+8*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX16821BATI+T    
    		Active TQFN;28 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0028 (PDF)
    Use pkgcode/variation: T2855+8*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX16821C Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX16821CATI+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX16821CATI+  
    		Active TQFN;28 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0028 (PDF)
    Use pkgcode/variation: T2855+8*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Topmark Coding: MAX16821
  		• New Product Press Release 2007-08-23 

    Related Products
    MAX16818 1.5MHz, 30A High-Efficiency LED Driver with Rapid LED Current Pulsing

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    Document Ref.: 19-0881; Rev 1; 2009-03-18
    This page last modified: 2009-08-18


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