Integrated Power Supply for TFT-LCD Panels with 1-Channel White LED Driver CXLC8985 includes a high-performance boost regulator, a VCOM buffer (unity gain OPA), a VGH charge pump driver, a VGL charge

   产品概述 返回TOPdjA嘉泰姆

The CXLC8985 includes a high-performance boost regulator, a VCOM buffer (unity gain OPA), a VGH charge pump driver, a VGL charge pump driver, and white LED driver for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high switching frequency (1.2MHz) current mode regulator with an integrated 20V N-Channel 0.7Ω MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 90%. The device can produce output voltage as high as 18V from an input as low as 2.8V. The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (150mA), fast slew rate (12V/μs), wide bandwidth (12MHz) and rail-to-rail input/output. A positive and a negative charge-pump driver provide adjustable regulated output voltages VGH and VGL to bias the TFT. Both charge-pump drivers operate with 600kHz switching frequency. The LED driver automatically regulated supply voltage for the LED light bars without the need to calculate the output for different LED types. It also integrates a 20V n-channel MOSFET that provides high output power. The low reference voltage minimized the power loss across the current-setting resistor. An enable input can be pulsed repeatedly to adjust LED’s brightness. The boost converter of the LED driver incorporates over current protection and over voltage protection to ensure safety operation. The CXLC8985 includes internal power-up sequencing, over/under voltage protections of the boost converter, and over temperature protection to ensure in safe operating. The CXLC8985 is available in a 24-pin 4X4 TQFN package.

   产品特点 返回TOPdjA嘉泰姆

„ 2.5V to 5.5V Input Supply Range djA嘉泰姆

„ Active-High Enable Control djA嘉泰姆

„ 1.2MHz Current-Mode Boost Regulator djA嘉泰姆

Š Fast Transient Response to Pulse Load djA嘉泰姆

Š ±1% Accurate Output Voltage djA嘉泰姆

Š Built-In 20V/1.8A, 0.7Ω N-Channel MOSFET djA嘉泰姆

Š High Efficiency up to 90% djA嘉泰姆

Š Over-Current Protection djA嘉泰姆

Š Output Under-Voltage Protection djA嘉泰姆

„ High-Performance Operational Amplifier djA嘉泰姆

Š ±150mA Output Short-Circuit Current djA嘉泰姆

Š 12V/μs Slew Rate Š 12MHz, -3dB Bandwidth djA嘉泰姆

Š Rail-to-Rail Input and Output djA嘉泰姆

„ 600kHz Negative Charge Pump Driver for VGL djA嘉泰姆

„ 600kHz Positive Charge Pump Driver for VGH djA嘉泰姆

„ White LED Driver Š 1MHz Switching Frequency djA嘉泰姆

Š 20V/1.2A, 0.3Ω N-channel MOSFET djA嘉泰姆

Š Input Under Voltage Protection djA嘉泰姆

Š Over Current Protection djA嘉泰姆

Š Over Voltage Protection djA嘉泰姆

Š Digital Dimming Control djA嘉泰姆

„ Power-On Sequence Control djA嘉泰姆

„ Thermal-Overload Protection djA嘉泰姆

„ RoHs Compliant djA嘉泰姆

„ TQFN4X4-24 PackagedjA嘉泰姆

   应用范围 返回TOPdjA嘉泰姆

„ Notebook Computer Displays djA嘉泰姆

„ UMPCs djA嘉泰姆

„ Medium Size LCD PaneldjA嘉泰姆

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