®
RT9955
PMIC for LCD TV / Monitor
General Description
Features
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.
The RT9955 supports input voltage from 8V to 14V and is
optimized for LCDTV panel and LCDmonitor applications
running directly from 12V supply.
8V to 14V Supply Input Voltage Range
Current Mode Boost Regulator
20V 3A 0.1Ω Internal N-MOSFET
Programmable Over Current Protection
Programmable Soft-Start
Current Mode Buck Regulator
16.5V 3.2A 0.15Ω Internal N-MOSFET
Over Current Protection
The boost and buck regulators feature internal power
MOSFETs and high frequency operation, allowing the use
of small inductors and capacitors, for in a compact solution.
Both switching regulators use fixed frequency, current
mode control architectures, providing fast load-transient
response and easy compensation.
Adjustable Output Voltage from 1.8V to 3.3V
Adjustable VGH Charge Pump
Continuous Output Current 50mA
Adjustable VGL Charge Pump
Continuous Output Current 50mA
Gate Pulse Modulator
18V to 35V Positive Supply Input
Power On/Off Sequence Control
On-Chip GPM Controller with Adjustable Falling
Time and Falling Stop Voltage
Voltage Detector (XAO)
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.
The GPM is controlled by frame signals from the timing
controller to modulate theGate-On voltage (VGHM), which
acts as a flicker compensation to reduce the coupling
effect between gate lines and pixels. It can also delay
VGHM while power on to achieve a correct power on
sequence for gate driver ICs. The VGHM power on delay
time, the falling time and falling stop voltage can all be
programmed by an external capacitor, an external resistor
and an resistive voltage divider.
Adjustable Detecting Voltage ( 1%)
N-CH Open-Drain Output
VCOM OP
5V to 20V Input Supply Voltage
300mA Output Short-Circuit Current for 1ms
45V/μs Slew Rate
20MHz, −3dB Bandwidth
HV LDO
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.
5V to 20V Input Supply Voltage
Adjustable Output Voltage ( 0.5%)
Over Current Protection (60mA)
Low Dropout Voltage 0.5V (60mA)
Selectable Frequency (500kHz/750KHz)
External PMOS Isolation Switch Controlled by Gate
Drive Signal
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.
Under Voltage Protection
The VCOM OP can drive the LCD VCOM voltage that
features high short circuit current (300mA), fast slew rate
(45V/μs), wide bandwidth (20MHz) and rail-to-rail inputs
and outputs.
Short Circuit Protection
Over Temperature Protection
Power On Sequence Control
Thin 48-Lead WQFN Package
RoHS Compliant and Halogen Free
The RT9955 is available in a smallWQFN-48L7x7 package.
Copyright 2018 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS9955-04 July 2018
www.richtek.com
1
5秒后页面跳转
TDA2030音频功率放大器：资料手册参数分析
74HC595移位寄存器芯片：参数深入解析与应用实践指南
AO3401场效应管参数、引脚图、应用原理图
BT131可控硅参数及引脚图、工作原理详解
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
