A8504: WLED/RGB Backlight Driver for Medium Size LCDs

These parts are discontinued.  Samples are no longer available. For new customers or new applications, please contact Allegro. Date of status change: December 2, 2013.

The A8504 is a multi-output WLED driver for medium display backlighting. The A8504 integrates a boost converter and eight current-sinks to provide a WLED/RGB backlight driver. The boost converter can provide output voltage up to 47 V. The flexible channel selection control and high voltage capability allow a wide range of LED backlight applications. The boost converter is a constant frequency current-mode converter. Each LED channel can sink 45 mA, and channels can be paralleled for higher currents. LED current can be controlled with external PWM duty cycle.

Applications include:

  • Thin notebook displays
  • LCD TV
  • RGB backlight
  • GPS systems
  • Portable DVD players

The A8504 is available in a 26 pin, 4 mm × 4 mm QFN/MLP package that is only 0.75 mm nominal in height.

DATASHEETS
SAMPLE & BUY

Astrorep Inc. (Allegro およびサンケン半導体、サンケン電源)
141 John Street, Suite 300
Babylon, NY 11702
電話: (631)422-2500
ファックス: (631)422-2504
Web: www.astrorepinc.com
電子メール: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Active current sharing among 8 LED strings for ±1.3% typical current matching
  • ±1.2% typical current accuracy
  • Drive up to 11 series × 8 parallel = 88 LEDs (Vf = 3.5 V, If = 40 mA)
  • External PWM control for LED dimming
  • An external resistor for LED current setting
  • Boost converter with integrated 50 V, 2 A DMOS
  • LED sinks rated for 45 mA
  • 200 kHz to 2 MHz switching frequency
  • Open LED disconnect
  • Boost current limit, thermal shutdown, and soft start
  • No audible ceramic capacitor noise during PWM dimming
  • Adjustable overvoltage protection (OVP)
  • No pull-up resistors required for LED modules that use ESD capacitors

The A8504 is available in a 26 pin, 4 mm × 4 mm QFN/MLP package that is only 0.75 mm nominal in height (suffix EC).

EC QFN/MLP with exposed pad 26 lead

 

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部品番号の仕様およびライフサイクル ステータス

Part Number Package Type Temperature RoHS
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A8504EECTR-T 26-lead QFN/MLP -40°C to 85°C Y データを見る 生産中止
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