Products > Integrated Circuits (ICs) > RT9921GQV

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Integrated Multi-Channel DC-DC Converter for TFT LCD Panels

  • Package/Case :
  • QFN-24
  • Product Categories :
  • Power Management IC
  • RoHs Status:
  • Lead free / RoHS Compliant
  • Marking Code:
  • A9=
  • In-stock:
  • 1354


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RT9921GQV Product Details


The RT9921GQV includes a high-performance boost regulator, a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a VCOM buffer (unitygain OPA), and a VGH charge pump controller for activematrix thin-film transistor (TFT) liquid-crystal displays (LCDs). 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 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 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. The low-dropout (LDO) linear regulator can supply up to 350mA current while input voltage is 3.3V. It uses an internal PMOS as the pass device. It is suitable for the supply voltage of the timing controller. The GPM is controlled by frame signals from timing controller to modulate the Gate-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 the Gate-On voltage are programmable by external capacitor and resistor. 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.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. 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

● 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%
● Programmable Soft-Start
● Over-Current Protection
● Output Under-Voltage Protection
● Low Dropout Voltage Linear Regulator
● Adjustable Output Voltage : 1.5V to VIN − 0.5V
   ( ±1.5%)
● Maximum Output Current : 350mA
● On-Chip GPM Controller with Adjustable
● Falling Time and Power-On Delay
● Flicker Compensator
● Power-On Sequence Control
● Low Voltage Detector
● Programmable Detecting Voltage (±2%) and Delay
● 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



  • 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% ► Programmable Soft-Start► Over-Current Protection► Output Under-Voltage Protection
  • Low Dropout Voltage Linear Regulator► Adjustable Output Voltage : 1.5V to VIN - 0.5V ( ±1.5%)► Maximum Output Current : 350mA
  • On-Chip GPM Controller with Adjustable ► Falling Time and Power-On Delay► Flicker Compensator► 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


  • Notebooks

RT9921GQV Block Diagram
(Picture: Diagram)

Technical Parameters

  • 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

RT9921GQV Related Products

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    Excellent seller, quality product, fast delivery. All 5 stars.

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Estimated Delivery Time: Jan 24 - Jan 29 days (choose Expedited at checkout).

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    90 days quality guarantee for all products.


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All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

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We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

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1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that RT9921GQV is the original manufacturer or agent of RICHTEK?
We have a professional business development department to strictly test and verify the qualifications of RICHTEK original manufacturers and agents. All RICHTEK suppliers must pass the qualification review before they can publish their RT9921GQV devices; we pay more attention to the channels and quality of RT9921GQV products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of RT9921GQV chips? Including RICHTEK original factory information, Power Management IC application, RT9921GQV pictures?
You can use Jotrin's intelligent search engine, or filter by Power Management IC category, or find it through Richtek Technology Corporation Information page.
Q: Are the RICHTEK's RT9921GQV price and stock displayed on the platform accurate?
The RICHTEK's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for RT9921GQV, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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Q: What is the process for returns or replacement of RT9921GQV?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the RT9921GQV we delivered, we will accept the replacement or return of the RT9921GQV only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of RT9921GQV.
(3)The RT9921GQV is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
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Richtek Technology Corporation

Richtek is an international analog IC design company specializing in providing customers with diverse and competitive products and complete power management solutions. Since its establishment, Richtek has focused on integrating technical capabilities, adhering to quality and positive customer ser...
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