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  • RT9955

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PMIC for LCD TV / Monitor

  • Package/Case :
  • WQFN7X7-48
  • Product Categories :
  • Power Management IC
  • RoHs Status:
  • Lead free/RoHS Compliant
  • In-stock:
  • 1500


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RT9955 Product Details

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 LCD TV panel and LCD monitor applications running directly from 12V supply. 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. 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 the Gate-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. 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 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. The RT9955 is available in a small WQFN-48L 7x7 package.


  • 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► 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)► 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► 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
  • Under Voltage Protection
  • Short Circuit Protection
  • Over Temperature Protection
  • Power On Sequence Control
  • Thin 48-Lead WQFN Package
  • RoHS Compliant and Halogen Free


  • LCD TV / Monitor
  • LCD TV

RT9955 Block Diagram
(Picture: Diagram)

Technical Parameters

  • Status
  • Active
  • Vin (min) (V)
  • 8
  • Vin (max) (V)
  • 14
  • Number of LDO Regulators
  • 1
  • Features
  • Adjustable Soft-Start
  • Package Type
  • WQFN7x7-48

RT9955 Related Products

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Estimated Delivery Time: May 26 - May 31 days (choose Expedited at checkout).

Shipping & Payment


  • Shipping Type
  • Ship Fee
  • Lead Time
  • $20.00-$40.00 (0.50 KG)
  • 2-5 days
  • $20.00-$40.00 (0.50 KG)
  • 3-7 days
  • $20.00-$45.00 (0.50 KG)
  • 2-5 days
  • $25.00-$65.00 (0.50 KG)
  • 2-5 days
  • $25.00-$45.00 (0.50 KG)
  • 5-14 days
  • $2.00-$3.00 (0.10 KG)
  • 7-30 days

Processing Time:Shipping fee depend on different zone and country.


  • Terms of payment
  • Hand Fee
  • Payment Site
  • charge US$30.00 banking fee.
  • charge 4.0% service fee.
  • charge 3.5% service fee.
  • charge US$0.00 banking fee.
  • charge US$0.00 banking fee.

We provide high quality products, thoughtful service and after sale guarantee

  • We have rich products, can meet your various needs.

    We have rich products, can meet your various needs.

  • Minimum order quantity starts from 1pcs.

    Minimum order quantity starts from 1pcs.

  • Lowest international shipping fee starts from US$2.00.

    Lowest international shipping fee starts from US$2.00.

  • 90 days quality guarantee for all products.

    90 days quality guarantee for all products.


  • Step1:Product

    Step1: Products

  • Step2:Vacuum packaging

    Step2: Vacuum Packaging

  • Step3:Anti-static bag

    Step3: Anti-Static Bag

  • Step4:Individual packaging

    Step4: Individual Packaging

  • Step5:Packaging boxes

    Step5: Packaging Boxes

  • Step6:bar-code shipping tag

    Step6: Bar-Code Shipping Tag

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

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

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.

Jotrin ESD packing


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 RT9955 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 RT9955 devices; we pay more attention to the channels and quality of RT9955 products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of RT9955 chips? Including RICHTEK original factory information, Power Management IC application, RT9955 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 RT9955 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 RT9955, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
Q: Can I place an order offline?
Yes. We accept offline orders.
We can provide order placement service. You only need to log in, click "My Orders" to enter the transaction management, and you will see the "Order Details" interface. After checking it, select all and click "Place Order". In addition, you can enjoy coupons or other selected gifts when placing orders online.
Q: What forms of payment can I use in Jotrin?
TT Bank, Paypal, Credit Card, Western Union, and Escrow is all acceptable.
Q: How is the shipping arranged and track my package?
Customers can choose industry-leading freight companies, including DHL, FedEx, UPS, TNT, and Registered Mail.
Once your order has been processed for shipment, our sales will send you an e-mail advising you of the shipping status and tracking number.
Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of RT9955?
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 RT9955 we delivered, we will accept the replacement or return of the RT9955 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 RT9955.
(3)The RT9955 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.
Q: How to contact us and get support, such as RT9955 datasheet pdf, RT9955 pin diagram?
Need any After-Sales service, please feel free contact us:

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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