RT9955 Overview
Description
The RT9955 generates all the supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) panels in TVs and monitors. It includes boost and buck regulators, VGH and VGL charge pump regulators, gate pulse modulator (GPM) , HV LDO, voltage detector (XAO) and VCOM OP.
Key Features
- internal power MOSFETs and high frequency operation, allowing the use of small inductors and capacitors, for in a compact solution
- The VGH and VGL charge pump regulators provide supply voltages for the TFT gate driver
- Both output voltages can be adjusted with external resistive voltage dividers
- It can also delay VGHM while power on to achieve a correct power on sequence for gate driver ICs
- The voltage detector (XAO) monitors VIN voltage to issue a reset signal when the VIN voltage is too low
- The detecting level is determined by an external resistive voltage divider
- The HV LDO can provide a highly accurate voltage (0.5%) for gamma reference voltage
- It has fast transient response and also a wide operation input range
- The RT9955 is available in a small WQFN-48L 7
