LTC3524: Adjustable TFT Bias Supply with WLED Driver Data Sheet2/11/2008260K
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 Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
DC1121A: Demo Board for LTC3524 - Adjustable TFT Bias Supply with WLED Driver
Documentation & Resources
R419 Reliability Data3/22/201827 K
DC1121A - Demo Manual9/24/2009595K
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