Datasheet > RT9921A

RT9921A

更新时间： 2024-09-21 17:00:47

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
15页	241K
描述
Integrated Multi-Channel DC/DC Converter for TFT LCD Panels

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RT9921A 技术参数

Status：	Active	Vin (min) (V)：	2.5
Vin (max) (V)：	5.5	Number of Channels：	5
Number of Buck Converters：	0	Number of Boost Converters：	1
Number of Negative Outputs：	1	Number of LED Drivers：	0
Number of LDO Regulators：	1	Features：	Adjustable Soft-Start;OCP;UVP
Package Type：	VQFN-4x4-24

RT9921A 数据手册

RT9921

Integrated Multi-Channel DC/DC Converter for TFT LCD

Panels

General Description

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.

The RT9921 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 thin-film transistor (TFT) liquid-crystal displays

(LCDs).

Features

^2.5V to 5.5V Input Supply Voltage

^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%

The boost converter provides the regulated supply voltage

for the panel source driver ICs. The converter is a high

switching frequency (640kHz or 1.2MHz) current-mode

regulator with an integrated 16VN-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 device

can produce output voltage as high as 15V from an input

as low as 2.5V. Soft-Start is programmed by external

capacitor, which sets the input-current ramp-rate.

^Programmable Soft-Start

^Over-Current Protection

^Output Under-Voltage Protection

 Low Dropout Voltage Linear Regulator

^Adjustable Output Voltage : 1.5V to V_IN− 0.5V

( 1.5%)

The low-dropout (LDO) linear regulator can supply up to

350mA current while input voltage is 3.3V. It uses an

internal P-MOSFET as the pass device. It is suitable for

the supply voltage of the timing controller.

^Maximum Output Current : 350mA

 On-Chip GPM Controller with Adjustable

^Falling Time and Power-On Delay

^Flicker Compensator

The GPM is controlled by frame signals from timing

controller to modulate theGate-On voltage, VGHM, which

acts a flicker compensation circuit to reduce the coupling

effect between gate lines and pixels. It also can delay the

Gate-On voltage while power-on for achieving a corrected

power-on sequence for gate driver ICs. Both of power-on

delay time and the falling time of theGate-On voltage are

programmable by external capacitor and resistor.

^Power-On Sequence Control

 Low Voltage Detector

 Programmable Detecting Voltage ( 2%) and Delay

Time

 Unity-Gain Operation Amplifier for VCOM Buffer

 Charge Pump for VGH regulation

 Over-Temperature Protection

 Thin 24 Lead VQFN Package

 RoHS Compliant and 100% Lead (Pb)-Free

The voltage detector monitors the supply voltage to issue

a reset signal while the detected voltage is too low. The

detecting level is decided by an external resistor divider

and the delay time is programmable by an external

capacitor.

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

The VCOM buffer can drive the LCD VCOM voltage that

features high short-circuit current (140mA), fast slew rate

(12V/μs), wide bandwidth (12MHz) and rail-to-rail inputs

and outputs.

is a registered trademark of Richtek Technology Corporation.

DS9921-04 May 2014

www.richtek.com

12 3 4 5 6 7...15

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