Datasheet > RT9955

RT9955

更新时间： 2024-11-11 17:01:19

品牌	Logo	应用领域
立锜 - RICHTEK		集成电源管理电路电视
页数	文件大小	规格书
19页	300K
描述
PMIC for LCD TV / Monitor

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RT9955 技术参数

Status：	Active	Vin (min) (V)：	8
Vin (max) (V)：	14	Number of Channels：
Number of Buck Converters：		Number of Boost Converters：
Number of Negative Outputs：		Number of LED Drivers：
Number of LDO Regulators：	1	Features：	Adjustable Soft-Start
Package Type：	WQFN7x7-48

RT9955 数据手册

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.

is a registered trademark of Richtek Technology Corporation.

DS9955-04 July 2018

www.richtek.com

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