Integrated LCD Bias Power Supply with Level Shifter CXLC8988 CXLC8989 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 VCOM buffers

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The CXLC8988 CXLC8989 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 VCOM buffers (unity-gain OPA), open-drain pull high VGLC signal generator and 7-channel level shifter with adjustable gate shading function for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost regulator provides the regulated supply voltage for the panel source driver ICs. It is a high switching frequency (1.2MHz) current-mode regulator with an integrated 20V/0.1Ω NMOS switch that allows the use of ultra small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 85%. The device can produce output voltage as high as 18V from an input as low as 2.8V. A voltage mode buck-boost controller cooperates with external temperature sensor provide compensated gate-off voltage supply to the level shifters. While the charge pump controller regulates the external charge pump voltage source to supply for the level shifters. The level shifters transform the logic-level control signals generated by the display timing controller (TCON) into the high-level signals needed by LCD panel. Each channel of level shifter output uses low impedance transistors to achieve fast rising and falling time, even when driving the capacitive loads present in LCD applications. Channel 1 to 6 supports gate voltage shading. They are organized in two groups, each with its own shading discharge resistor output. External R-C timer defines shading period though the DTS input. The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (200mA), fast slew rate (20V/μs), wide bandwidth (8MHz) and rail-to-rail input/output.

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„ 2.6V~5.5V Supply Range oKT嘉泰姆

„ Current Mode Boost Regulator for AVDD oKT嘉泰姆

Š 0.1Ω/20V/3A Embedded NMOS switch oKT嘉泰姆

Š Fixed 1.2MHz Switching Frequency oKT嘉泰姆

Š Up to 85% Efficiency oKT嘉泰姆

Š 1% Output Regulation oKT嘉泰姆

„ Voltage Mode Buck-Boost Regulator for VGOFF oKT嘉泰姆

Š Fixed 600kHz Switching Frequency oKT嘉泰姆

Š Up to 85% Efficiency oKT嘉泰姆

Š 1% Output Regulation oKT嘉泰姆

„ Charge Pump Regulator for VGON oKT嘉泰姆

„ 3-Channel Rail-to-Rail Unity-Gain Operational Amplifier oKT嘉泰姆

Š ±200mA Output Short Circuit Current oKT嘉泰姆

Š 20V/μs Slew Rate oKT嘉泰姆

Š 18MHz, -3dB Bandwidth oKT嘉泰姆

„ Built-In Power On Sequence and Soft Start Function oKT嘉泰姆

„ 7-Channel Level Shifter oKT嘉泰姆

Š +33V Highest Voltage Level oKT嘉泰姆

Š -30V Lowest Voltage Level oKT嘉泰姆

Š Maximum 1μs Rising/Falling Time oKT嘉泰姆

Š 300mA Peak Current oKT嘉泰姆

Š 15mA Continuous Current oKT嘉泰姆

Š Adjustable Gate Shading Function oKT嘉泰姆

„ Opened Drain Pull High VGLC Signal oKT嘉泰姆

„ Protections: oKT嘉泰姆

Š Input Under Voltage Lockout (UVLO) oKT嘉泰姆

Š Over Current Protection for AVDD (OCP) oKT嘉泰姆

Š Output Under Voltage Protection for AVDD, GON and GOFF (UVP) oKT嘉泰姆

Š Output Over Voltage Protection for AVDD, GON and GOFF (OVP) oKT嘉泰姆

Š Operational Amplifier Short Circuit Protection (SCP) oKT嘉泰姆

Š Over Temperature Protection (OTP) oKT嘉泰姆

„ TQFN6x6-48L Package oKT嘉泰姆

„ RoHS CompliantoKT嘉泰姆

   应用范围 返回TOPoKT嘉泰姆

„ LCD TV Panel oKT嘉泰姆

„ LCD Monitor PaneloKT嘉泰姆

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