EUP2681

EUP2681 TFT LCD DC-DC Converter with Integrated Charge Pumps, OP-AMP and HV-Switch DESCRIPTION The EUP2681 generates power supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) panels in monitors and notebooks operated from 2.5V to 5.5V input supply. The device integrates a step-up converter, positive and negative charge pumps, a high speed VCOM buffer and a HV-Switch. The external compensated step-up converter features an internal power MOSFET and high frequency operation allowing to use small inductors and capacitors. The step up converter uses fixed-frequency peak current mode control architecture which provides fast load-transient response and easy compensation. A 3.5A peak current limit for the internal switch protects power supply fault condition. The regulated positive and negative charge pump regulators generate the positive and negative supply rails for the TFT LCD gate resistive voltage-divider ICs. The high speed VCOM buffer features 500mA short circuit current, 20MHz bandwidth, fast slew rate 45V/µs, and rail-to-rail inputs and outputs. The HV-Switch circuit control provides the ability to control the slope for the gate drive voltage. It shapes the TFT gate high voltage to improve image quality. FEATURES 2.5V to 5.5V Input Supply Range 1.2MHz Current Mode Step Up Converter - Built-In 20V, 3.5A, 0.16Ω N-MOSFET - High Efficiency Up to 90% - Internal digital Soft-Start - Fast Transient Response to Pulsed Load - Over-Temperature Protection Regulate...