描述 Description

The LP6284 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 active matrix TFT LCDs. The converter is a high switching frequency (640kHz or 1.2MHz) current-mode regulator with an integrated 16V 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 low-dropout (LDO) linear regulator can supply up to 350mA current while input voltage is 3.3V. It is suitable for the supply voltage of the timing controller. The Unity-Gain buffer can drive the LCD VCOM voltage that features high short-circuit current, fast slew rate and rail-to-rail inputs and outputs. 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. Other features include thermal shutdown protection and under-voltage lockout (UVLO). The LP6284 is available in a space saving QFN-24 (0.5mm pitch) package.

特性 Features

·? Wide VIN Range: 2.5V to 5.5V
·? 640kHz/1.2MHz Current-Mode Boost Regulator
·?Fast Transient Response to Pulsed Load
·?Adjustable Output Voltage (±1%)
·?Built-In 16V, 2A, 0.2Ω N-MOSFET
·?High Efficiency Up to 90%
·?Programmable Soft-Start
·? Low Dropout Voltage Linear Regulator
·?Maximum Output Current : 350mA
·?Adjustable Output Voltage : 1.5V to VIN ?
·0.5V( ±1.5%)
·? GPM Controller with Adjustable
·?Power-On Sequence Control
·?Power-On Delay and Falling Time
·?Flicker Compensator
·? Low Voltage Detector
·?Programmable Detecting Voltage (±2%)
·?Programmable Delay Time
·? Unity-Gain Operation Amplifier for VCOM Buffer
·? Charge Pump for VGH regulation
·? Under-Voltage Protection
·? Over-Temperature Protection
·? Available in QFN-24 (4×4mm)
·? RoHS Compliant and Halogen Free
·? Pb-Free Package

應(yīng)用 Application

·? TFT LCD TV
·? TFT LCD Monitor