Bias Power Supply for TFT LCD Panels CXLC8994 CXLC8994A/S includes a high-performance boost regulator, a VCOM buffer (unity gain OPA), a VGH charge pump driver, and a VGL charge pump driver for active

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The CXLC8994 CXLC8994A/S includes a high-performance boost regulator, a VCOM buffer (unity gain OPA), a VGH charge pump driver, and a VGL charge pump 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 the charge-pump driver operate with 600kHz switching frequency. The CXLC8994 CXLC8994A/S includes internal power-up sequencing, over/under voltage protections of the boost converter, and over temperature protection to ensure in safe operating. The CXLC8994 CXLC8994A/S are available in a 16-pin 3X3TQFN packages.

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 „ 2.5V to 5.5V Input Supply Range o2L嘉泰姆

„ 1.2MHz Current-Mode Boost Regulator o2L嘉泰姆

Š Fast Transient Response to Pulse Load o2L嘉泰姆

Š ±1% Accurate Output Voltage o2L嘉泰姆

Š Built-In 20V/1.8A, 0.7Ω N-Channel MOSFET o2L嘉泰姆

Š High Efficiency up to 90% o2L嘉泰姆

Š Over-Current Protection o2L嘉泰姆

Š Output Under-Voltage Protection o2L嘉泰姆

„ High-Performance Operational Amplifier o2L嘉泰姆

Š ±150mA Output Short-Circuit Current o2L嘉泰姆

Š 12V/μs Slew Rate o2L嘉泰姆

Š 12MHz, -3dB Bandwidth o2L嘉泰姆

Š Rail-to-Rail Input and Output o2L嘉泰姆

„ 600kHz Negative Charge Pump Driver for VGL o2L嘉泰姆

„ 600kHz Positive Charge Pump Driver for VGH o2L嘉泰姆

„ Power-On Sequence Control o2L嘉泰姆

„ Thermal-Overload Protection o2L嘉泰姆

„ TQFN3X3-16 Packageo2L嘉泰姆

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„ Photo Frame o2L嘉泰姆

„ GPS o2L嘉泰姆

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