Datasheet Linear Technology LT1943

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Design Notes

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  Quad Output Switching Converter Provides Power for Large TFT LCD Panels &mdash DN349
  PDF, 90 Kb, File published: Oct 1, 2004
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  Quad Output Switching Converter Provides Power
  for Large TFT LCD Panels – Design Note 349
  Dongyan Zhou
  All four regulators are synchronized to a 1.2MHz internal
  clock, allowing the use of small, low cost inductors and
  ceramic capacitors. Since different types of panels may
  require different bias voltages, all output voltages are
  adjustable for maximum flexibility. Programmable softstart capability is included in all outputs to limit inrush
  current. The LT1943 has a built-in start-up sequence
  and panel protection feature. The LT1943 is available
  in a low-profile 28-pin TSSOP package. Introduction
  The LTВ®1943 is a highly integrated, 4-output regulator
  designed to power large TFT LCD panels. The LT1943
  employs switching regulators—instead of linear regulators—to minimize power dissipation and accommodate
  a wide input voltage range. The wide input range, 4.5V
  to 22V, allows it to accept a variety of power sources,
  including the commonly used 5V, 12V and 19V AC adaptors. The п¬Ѓrst buck regulator provides a logic voltage
  with up to 2A of current. The other three switching
  regulators provide the three bias voltages, AVDD, VON
  and VOFF, required by LCDs.
  VOFF
  –10V
  50mA ZHCS400 0.47ОјF …

Articles

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  Quad Output Switching Regulator Powers Large TFT Displays &mdash LT Journal
  PDF, 208 Kb, File published: Feb 1, 2004
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  DESIGN IDEAS Quad Output Switching Regulator
  by Dongyan Zhou
  Powers Large TFT Displays
  Introduction The LT1943 is a highly integrated,
  four -output switching regulator
  designed to power large TFT Liquid
  Crystal Displays (LCDs). The first
  step-down switching regulator provides a logic voltage with up to 2A of
  current. The other three regulators are
  a high-power boost regulator, a lowpower boost regulator and an inverting
  regulator, which provide the three
  bias voltages, AVDD, VON and VOFF,
  required by LCDs. Switching regulators are chosen over linear regulators
  to accommodate a wide input voltage
  range (providing both step up and step
  down functions) and to minimize power
  dissipation. The LT1943’s wide input
  range, 4.5V to 22V, allows it to accept
  a variety of power sources, including
  the commonly used 5V, 12V and 19V
  rails. The low-profile 28-pin TSSOP
  package has an exposed metal pad
  on the backside to maximize thermal …

Model Line

Manufacturer's Classification

• Power Management > Switching Regulator > LCD/CCD/OLED Bias
• Power Management > Switching Regulator > Step-Up (Boost) Regulators > Internal Power Switch Boost | Multiple Output Boost
• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Internal Power Switch Buck
• Power Management > PMIC & Multifunction > Multitopology DC/DC