Integrated LCD Bias Power Supply CXLC8990 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 VCOM buffers (unity-gain OPA) for active-matrix

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The CXLC8990 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 VCOM buffers (unity-gain OPA) 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/0.15Ω 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 other devices. 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. The CXLC8990 features extensive protection functions that include UVLO, OCP, UVP, OVP, and OTP. It is available in a QFN5X5-32 package.

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„ 2.6V~5.5V Supply Range z78嘉泰姆

„ Current Mode Boost Regulator for AVDD z78嘉泰姆

Š 0.15Ω/20V/3A Embedded NMOS switch z78嘉泰姆

Š Fixed 1.2MHz Switching Frequency z78嘉泰姆

Š Up to 85% Efficiency z78嘉泰姆

Š 1% Output Regulation z78嘉泰姆

„ Voltage Mode Buck-Boost Regulator for VGL z78嘉泰姆

Š Fixed 600kHz Switching Frequency z78嘉泰姆

Š Up to 85% Efficiency z78嘉泰姆

Š 1% Output Regulation z78嘉泰姆

„ Charge Pump Regulator for VGH z78嘉泰姆

„ 3-Channel Rail-to-Rail Unity-Gain Operational Amplifier z78嘉泰姆

Š ±200mA Output Short Circuit Current z78嘉泰姆

Š 20V/μs Slew Rate z78嘉泰姆

Š 18MHz, -3dB Bandwidth z78嘉泰姆

„ Built-In Power On Sequence and Soft Start Function z78嘉泰姆

„ Protections: z78嘉泰姆

Š Input Under Voltage Lockout (UVLO) z78嘉泰姆

Š Over Current Protection for AVDD (OCP) z78嘉泰姆

Š Output Under Voltage Protection for AVDD, VGH and VGL (UVP) z78嘉泰姆

Š Output Over Voltage Protection for AVDD, VGL (OVP) z78嘉泰姆

Š Operational Amplifier Short Circuit Protection (SCP) z78嘉泰姆

Š Over Temperature Protection (OTP) z78嘉泰姆

„ QFN5X5-32 Package z78嘉泰姆

„ RoHS Compliantz78嘉泰姆

   应用范围 返回TOPz78嘉泰姆

„ LCD TV Panel z78嘉泰姆

„ LCD Monitor Panelz78嘉泰姆

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