Integrated Multi-Channel DC-DC Converter for TFT-LCD Panels CXLC8995/A includes a high-performance boost regulator, a low dropout linear regulator (LDO), a gate pulse modulator (GPM)

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The CXLC8995/A includes a high-performance boost regulator, a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a VCOM buffer (unity-gain OPA), and a VGH charge pump controller for activematrix 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 (640kHz or 1.2MHz) currentmode regulator with an integrated 20V N-Channel 0.2Ω 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. Soft-Start is programmed by external capacitor, which sets the input-current ramp-rate. The low-dropout (LDO) linear regulator can supply up to 350mA current while input voltage is 3.3V. It uses an internal PMOS as the pass device. It is suitable for the supply voltage of the timing controller. The GPM is controlled by frame signals from timing controller to modulate the Gate-On voltage, VGHM, which acts a flicker compensation circuit to reduce the coupling effect between gate lines and pixels. It also can delay the Gate-On voltage while power-on for achieving a corrected power-on sequence for gate driver ICs. Both of power-on delay time and the falling time of the Gate-On voltage are programmable by external capacitor and resistor. The voltage detector monitors the supply voltage to issue a reset signal while the detected voltage is too low. The detecting level is decided by an external resistor divider and the delay time is programmable by an external capacitor. 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. The VGH charge pump controller provides regulated TFT Gate-On voltage. The regulation of the positive charge pump is generated by the internal comparator that senses the output voltage and compares it with an internal reference.

   产品特点 返回TOPyXa嘉泰姆

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

„ 640kHz/1.2MHz Current-Mode Boost Regulator yXa嘉泰姆

Š Fast Transient Response to Pulse Load yXa嘉泰姆

Š ±1% Accurate Output Voltage yXa嘉泰姆

Š Built-In 20V/2A, 0.2Ω N-Channel MOSFET yXa嘉泰姆

Š High Efficiency up to 90% yXa嘉泰姆

Š Programmable Soft-Start yXa嘉泰姆

Š Over-Current Protection yXa嘉泰姆

Š Output Under-Voltage Protection yXa嘉泰姆

„ High-Performance Operational Amplifiers ±150mA Output Short-Circuit Current yXa嘉泰姆

Š 12V/μs Slew Rate yXa嘉泰姆

Š 12MHz, -3dB Bandwidth yXa嘉泰姆

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

„ Low Dropout Voltage Linear Regulator yXa嘉泰姆

Š 350mA Maximum Output Current yXa嘉泰姆

Š Adjustable Output Voltage yXa嘉泰姆

„ On-Chip GPM Controller yXa嘉泰姆

Š Adjustable Falling Time and Power-On Delay yXa嘉泰姆

Š Flicker Compensator yXa嘉泰姆

Š Power-On Sequence Control yXa嘉泰姆

„ Charge pump for VGH regulation yXa嘉泰姆

„ Low Voltage Detector yXa嘉泰姆

 Š Programmable Detecting Voltage and Delay Time yXa嘉泰姆

„ Thermal-Overload Protection yXa嘉泰姆

„ RoHs Compliant yXa嘉泰姆

„ TQFN4X4-24 PackageyXa嘉泰姆

   应用范围 返回TOPyXa嘉泰姆

„ LCD Monitor yXa嘉泰姆

„ Notebook Computer Displays yXa嘉泰姆

„ LCD TVsyXa嘉泰姆

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