LTC3524 - Adjustable TFT Bias Supply with WLED Driver

Features

  • Generates Three Adjustable, Low Noise Rails for Small/Medium TFT Displays
  • Drives Up to Ten White LEDs
  • LED Dimming and Open-Circuit Protection
  • Controlled Power-Up/Power-Down Sequencing
  • 1.5MHz Fixed Frequency, Low Noise Operation
  • VIN Range 2.5V to 6V, VOUT Range 3V to 6V
  • TFT Supply Efficiency Up to 90%
  • LED Supply Efficiency Up to 78%
  • Two independently Enabled LED Strings
  • 200 to 1 True Color PWM Dimming
  • Tiny External Solution
  • 24-Lead QFN Package (4mm x 4mm x 0.75mm)

Typical Application

LTC3524 Typical Application
LTC3524 Typical Application

Description

The LTC3524 is an integrated BIAS and white LED power converter solution for small/medium-sized polysilicon thin film transistor (TFT) liquid crystal (LCD) display panels. The device operates from a single Lithium-Ion/polymer battery or any voltage source between 2.5V and 6V.

A 1.5MHz synchronous boost converter generates a programmable low noise, high efficiency 25mA TFT supply of up to 6.0V. Regulated, low ripple charge pumps are used to generate up to +20V and -20V at 2mA. Output sequencing is internally controlled to insure proper initialization and rapid discharge of the LCD panel in shutdown.

A second 1.5MHz boost converter powers one or two LED strings with up to five series elements each. LED current and display brightness can be controlled over a wide range using analog or digital means up to 25mA.

The LTC3524 is offered in the 4mm x 4mm 24-pin QFN package, minimizing the total solution footprint.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
Drawing
RoHS
LTC3524EUF#PBF 4x4 QFN-24 UF E 05-08-1697 Yes
LTC3524EUF#TRPBF 4x4 QFN-24 UF E 05-08-1697 Yes


LTC3524 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3524EUF#PBF 4x4 QFN-24 E $3.22 $2.25 Yes
LTC3524EUF#TRPBF 4x4 QFN-24 E $2.31 Yes
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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.

Part Number Description Price Documentation
DC1121A LTC3524EUF | Five Output Power Supply and LED Driver for Small to Med TFT-LCDs $125.00
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Click here to view our complete list of demo boards

Applications

  • PDAs, Palmtop Computers
  • Digital Still and Video Cameras
  • Handheld GPS
  • Portable Instrument Displays
  • Portable Media Players

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Design Tools

LTspice

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LTC3524

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