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  Versatile TFT LCD Bias Supply and White LED Driver in a 4mm Г— 4mm QFN &mdash DN440
  PDF, 147 Kb, Datei veröffentlicht: Apr 16, 2008
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  Versatile TFT LCD Bias Supply and White LED Driver
  in a 4mm × 4mm QFN – Design Note 440
  Eddy Wells
  Introduction
  The makers of handheld medical, industrial and consumer
  devices use a wide variety of high resolution, small to
  medium sized color TFT LCD displays. The power supply
  designers for these displays must contend with shrinking board area, tight schedules, and variations in display
  types and feature requirements. The LTC ®3524 simplifies
  the designer’s job by combining a versatile, easily programmed, TFT LCD bias supply and white LED backlight
  driver in a low profile 4mm × 4mm QFN package. A second nonsynchronous boost converter generates the
  voltage required to regulate one or two LED strings at
  up to 25mA each. LED current can be adjusted by either
  analog or digital means, optimizing the TFT display for
  varying ambient light conditions. Each string is independently enabled and can contain 1 to 5 LEDs in series.
  Internal circuitry maintains equal current in the strings,
  even when the forward voltage drops of the LEDs do not
  match. Open LED protection is provided to prevent the
  output from exceeding 24V. The LTC3524’s 2.5V to 6V input supply range is ideally
  suited for portable devices powered from Li-Ion or
  multiple alkaline or nickel cells. Both the LCD and LED
  drivers operate at 1.5MHz, allowing the use of tiny, low
  cost, inductors and capacitors. 3-Output TFT Supply with Digitally Dimmed LED …

Modellreihe

Herstellerklassifikation

• Power Management > Switching Regulator > LCD/CCD/OLED Bias
• Power Management > PMIC & Multifunction > Multitopology DC/DC

Andere Namen:

LTC3524EUFPBF, LTC3524EUF PBF