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LTC3524

Linear Technology Corporation
Part Number LTC3524
Manufacturer Linear Technology Corporation
Description Adjustable TFT Bias Supply
Published Jan 12, 2009
Detailed Description FEATURES Generates Three Adjustable, Low Noise Rails for Small/Medium TFT Displays ■ Drives Up to Ten White LEDs ■ LED D...
Datasheet PDF File LTC3524 PDF File

LTC3524
LTC3524

Overview
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 www.
DataSheet4U.
com ■ V Range 2.
5V to 6V, V IN OUT Range 3V to 6V ■ TFT Supply Efficiency Up to 90% ■ LED Supply Efficiency Up to 78% ■ Two Independantly Enabled LED Strings ■ 200 to 1 True Color PWMTM Dimming ■ Tiny External Solution ■ 24-Lead QFN Package (4mm × 4mm × 0.
75mm) ■ LTC3524 Adjustable TFT Bias Supply with WLED Driver DESCRIPTION The LTC®3524 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM is a registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIONS ■ ■ ■ ■ ■ PDAs, Palmtop Computers Digital Still and Video Cameras Handheld GPS Portable Instrument Displays Portable Media Players TYPICAL APPLICATION +5V, –7.
5V, +12.
5V, 8 LED Power Supply + – +5V 25mA 2.
2μF SW1 10μH VIN 3.
3μH SW2 VLED LED2 LED1 LTC3524 PRO...


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