Features and Benefits

  • Complete Solution Under 1.2mm
  • Develops Three Outputs from a 3.3V or 5V Supply
  • Externally Programmable VON Delay
  • Fixed Frequency Low Noise Outputs
  • All Ceramic Capacitors
  • 3MHz Switching Frequency
  • Fast Transient Response
  • Few External Components Required
  • 2.7V to 8V Input Range
  • Adjustable AVDD and VON Voltages
  • Tiny 10-Lead MSOP and Thermally Enhanced 10-Lead MSOP Packages

Product Details

The LT1947 is a highly integrated multiple output DC/DC converter designed for use in TFT-LCD panels. The device contains two independent switching regulators. The main regulator has an adjustable output voltage with an internal 1.1A switch that can generate a boosted voltage as high as 30V. The second regulator’s output is also adjustable up to 30V and can deliver 10mA for positive bias. A simple level-shift charge pump off the main switch node generates the negative bias voltage. An external capacitor sets the delay time from AVDD’s final value to the rising edge at the VON pin. The 3MHz switching frequency allows the use of tiny low profile chip inductors and capacitors throughout, providing a low noise, low cost total solution with all components under 1.2mm in height. The device operates from an input range of 2.7V to 8V and is available in 10-lead MSOP and thermally enhanced 10-lead MSOP packages.


  • TFT-LCD Notebook Display Panels
  • TFT-LCD Desktop Monitor Display Panels
  • Digital Cameras
  • Handheld Computers

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Models for the following parts are available in LTspice:


Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Sample & Buy

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