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The maximum efficiency of the power supply circuit for the liquid crystal panel is 90%. The built-in boost converter switch uses synchronous rectification. When the power supply voltage of the LCD panel is +6V, it can output a maximum of 25mA. In addition, when the power supply voltage of the gate driver circuit is +20V and -20V, the maximum current of 2mA can be respectively output. It also has a timing function that controls the rise and fall of the output voltage.
The output to the LED is two channels. A maximum dimming ratio of 200:1 can be maintained by PWM dimming, and up to 10 (up to 5 per channel) white LEDs can be powered. The maximum efficiency of the LED driver circuit is 78%.
The package uses a QFN of 4.0 mm x 4.0 mm x 0.75 mm. When you purchase 1000 in bulk, the reference price starts from 248 yen.
English information
LTC3524: Adjustable TFT Bias Power Supply for TFT-LCDs & LED Driver in a 4x4mm QFN
Milpitas, California (Southern) ?C March 20, 2008
MILPITAS, CA ?C March 20, 2008 ?C Linear Technology announces the LTC3524, an integrated BIAS and white LED power converter solution for small to medium sized (3" to 7") thin film transistor (TFT) liquid crystal display (LCD) Pan s. The device operates from an input voltage range of 2.5V to 6V, enabling it to accommodate multicell alkaline/NiMH batteries as well as single cell Li-Ion. Each low noise output of the TFT converter is fully adjustable enabling it to The LTC3524 can generate up to 25mA at 6V for the AVDD channel, and up to 2mA at 20V and -20V for the respective VGH and VGL bias requirements with controlled power-up/power-down sequencing.
As the primary boost converter uses a synchronous rectification topology, the LTC3524 can deliver up to 90% efficiencies for the LCD biasing. The dual channel LED driver can power up to 10 white LEDs (5 per channel) while its True Color PWM Dimming offers up To 200:1 dimming ratios. Each LED channel is independent and offers open-LED protection. Total quiescent current is only 200uA, providing maximum battery life and its 1.5MHz switching frequency, combined with its 4mm x 4mm QFN package enables a tiny, low Profile footprint.
The LTC3524EUF is available from stock in a 4mm x 4mm QFN package. Pricing starts at $2.25 for 1,000-piece quantities.
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) 
Linear Technology's listed LED driver IC "LTC3524"
LED driver IC "LTC3524". Mainly for small 3 to 7 inch TFT LCD panels. The input voltage range is +2.5 to +6.0V, which is mainly used for devices driven by multiple alkaline batteries, nickel-hydrogen batteries or single lithium-ion rechargeable batteries. The operating frequency is 1.5MHz. The output voltage range is +3.0 to 6.0V. The total current consumption is up to 200μA.