LT1947 - Adjustable Output TFT-LCD Triple Switching Regulator

Features

  • 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

Typical Application

LT1947 Typical Application
LT1947 Typical Application

Description

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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

MS-10

LT1947 Package Drawing
LT1947 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1947EMS MSOP 10 E $3.08 $2.60 View
LT1947EMS#PBF MSOP 10 E $3.08 $2.60 View
LT1947EMS#TR MSOP 10 E $2.66 View
LT1947EMS#TRPBF MSOP 10 E $2.66 View
LT1947EMSE MSOP 10 E $3.08 $2.60 View
LT1947EMSE#PBF MSOP 10 E $3.08 $2.60 View
LT1947EMSE#TR MSOP 10 E $2.66 View
LT1947EMSE#TRPBF MSOP 10 E $2.66 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

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

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Design Tools

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

Models for the following parts are available in LTspice IV:
LT1947

Technical Support