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MAX8798 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8798 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 30 page General Description The MAX8798 includes a high-performance, step-up regulator; a high-speed operational amplifier; a digitally adjustable VCOM calibration device with nonvolatile memory and an I2C interface; and a high-voltage, level- shifting scan driver. The device is optimized for thin-film transistor (TFT) liquid-crystal display (LCD) applications. The step-up DC-DC converter provides the regulated supply voltage for panel source driver ICs. The high switching frequency allows the use of ultra-small induc- tors and ceramic capacitors. The current-mode control architecture provides fast transient response to pulsed loads typical of source driver loads. The step-up regu- lator features soft-start and current limit. The high-current operational amplifier is designed to drive the LCD backplane (VCOM). The amplifier fea- tures high output current (±150mA), fast slew rate (45V/µs), wide bandwidth (20MHz), and rail-to-rail inputs and outputs. The programmable VCOM calibrator is externally attached to the VCOM amplifier’s resistive voltage-divider and sinks a programmable current to adjust the VCOM output-voltage level. An internal 7-bit digital-to-analog converter (DAC) controls the sink current. The DAC is ratiometric relative to BOOST and is guaranteed to be monotonic over all operating conditions. The calibrator IC includes an EEPROM to store the desired VCOM voltage level. The 2-wire I2C interface between the LCD panel and the programming circuit minimizes panel connector pin count and simplifies production equipment. The high-voltage, level-shifting scan driver is designed to drive the TFT panel gate drivers. Its three outputs swing from +35V (maximum) to -25V (minimum) and can swiftly drive capacitive loads. To save power, the two complementary outputs are designed to allow charge sharing during state changes. The MAX8798 is available in a 36-pin, thin QFN pack- age with a maximum thickness of 0.8mm for ultra-thin LCD panels. Applications Notebook Computer Displays LCD Monitor Panels Features o 1.8V to 5.5V IN Supply Voltage Range o 1.8V to 4.0V VDD Input Voltage Range o 1.2MHz Current-Mode Step-Up Regulator Fast Transient Response Built-In 20V, 1.9A, 150m Ω MOSFET o High-Speed (20MHz) Operational Amplifier ±150mA Output Current o High-Voltage Drivers with Scan Logic +35V to -25V Outputs Output Charge Sharing o Programmable VCOM Calibrator 7-Bit Adjustable Current-Sink Output I2C Interface EEPROM Setting Memory o Thermal-Overload Protection Internal-Switch Boost Regulator with Integrated 3-Channel Scan Driver for TFT LCDs ________________________________________________________________ Maxim Integrated Products 1 Ordering Information SCAN DRIVER LOGIC AND GATE DRIVERS VMAIN VIN VN VP TO VCOM BACKPLANE SDA COMP LX PGND BGND VCOM POS NEG FB VP SCL BOOST GON IN SET STVP GOFF CKVBCS CKV SHDN OECON STV OE CPV WPN CKVCS CKVB WPP SCLS VDD OUT I2C BUS VIN SYSTEM VN PANEL VL 3.3V LINEAR REG VCOM CALIBRATOR 7 GND AGND 1.9A STEP-UP REG DISH 1k Ω 50k Ω Simplified Operating Circuit 19-0971; Rev 0; 9/07 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE PART TEMP RANGE PIN- PACKAGE PKG CODE MAX8798ETX+ -40°C to +85°C 36 Thin QFN 6mm x 6 mm T-3666M-1 |
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