Features and Benefits
- 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 × 4mm × 0.75mm)
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 × 4mm 24-pin QFN package, minimizing the total solution footprint.
- PDAs, Palmtop Computers
- Digital Still and Video Cameras
- Handheld GPS
- Portable Instrument Displays
- Portable Media Players
Product Lifecycle 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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
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.
Sample & Buy
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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.