Datasheet Linear Technology LT3489EMS8E#PBF

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Design Notes

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  Drive Large TFT-LCD Displays with a Space-Saving Triple-Output Regulator &mdash DN417
  PDF, 130 Kb, File published: Dec 18, 2006
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  Drive Large TFT-LCD Displays with a Space-Saving Triple-Output
  Regulator – Design Note 417
  Jesus Rosales Introduction
  The power appetite of large TFT-LCDs appears to be
  insatiable. Power supplies must feed increasing numbers
  of transistors and improved display resolutions, and do
  so without taking much space.
  The triple output supply shown in Figure 1 shows a compact design based on the LT3489, which is optimized for
  driving large TFT panel displays. The main output provides
  8V at 600mA while the 23V and –8V outputs provide 10mA
  and 20mA respectively, all from a 3.3V input. Even though
  TFT converters generally run from a regulated 3.3V or
  5V source, this converter can operate seamlessly from
  a Lithium-Ion battery, delivering 5W when the battery is
  drained to 3.3V and 8W when it is at 4.2V.
  The LT3489 squeezes a 2.5A, 0.12О©, 40V switch into a
  tiny 3mm Г— 3mm MS8E footprint. It offers external or
  internal compensation, an internal soft-start, a 2MHz switching frequency, and it is also pin compatible with
  the popular LT1946. The design process with the LT3489
  is easy and predictable.
  The circuit in Figure 2 operates as a SEPIC converter,
  allowing the output to be higher or lower than the input.
  Pulling the вЋЇSвЋЇHвЋЇDвЋЇN pin to ground sets the output at 0V even …

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Manufacturer's Classification

• Power Management > Switching Regulator > LCD/CCD/OLED Bias | SEPIC Regulators
• Power Management > Switching Regulator > Step-Up (Boost) Regulators > Internal Power Switch Boost

Other Names:

LT3489EMS8EPBF, LT3489EMS8E PBF