Products > Integrated Circuits (ICs) > RT8239BZQW
  • RT8239BZQW

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High Efficiency, Main Power Supply Controller for Notebook Computers

  • Package/Case :
  • WQFN20
  • Product Categories :
  • Switching Regulators ; Single-Phase Step-Down Controller
  • RoHs Status:
  • Lead free / RoHS Compliant
  • In-stock:
  • 4459


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RT8239BZQW Product Details

The RT8239A/B/C is a dual step down, Switch Mode Power Supply (SMPS) controller which generates logic supply voltages for battery powered systems. It includes two Pulse Width Modulation (PWM) controllers adjustable from 2V to 5.5V and also two fixed 5V/3.3V linear regulators. One of the controllers (LDO5) provides automatic switch over to the BYP1 input connected to the main SMPS1 output for maximized efficiency. An optional external charge pump can be monitored through SECFB (RT8239B/C). Other features include on board power up sequencing, a power good output, internal soft-start, and a soft discharge output that prevents negative voltage during shutdown.A constant on-time PWM control scheme operates without sense resistors and assures fast load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, a diode emulation mode maximizes efficiency for light load applications. The SMPS1/SMPS2 switching frequency can be adjustable from 200kHz/233kHz to 400kHz/466kHz respectively.The RT8239A/B/C is available in a WQFN-20L 3x3 package, and operates over an extended temperature range from -40°C to 85°C.


  • 5.5V to 25V Input Voltage Range
  • 2V to 5.5V Output Voltage Range
  • No Current Sense Resistor Needed
  • 5V/3.3V Linear Regulators
  • 4700ppm/°C RDS(ON) Current Sensing
  • Internal Current Limit Soft-Start and Soft Discharge Output
  • Built In OVP/UVP/OCP
  • Selectable Operation Mode with Switcher Enable Control (RT8239A)
  • SECFB Input Maintains Charge Pump Voltage (RT8239B/C)
  • Power Good Indicator (RT8239B/C includes SECFB)
  • RoHS Compliant and Halogen Free


  • Notebook computers
  • System Power Supplies
  • 3- and 4- Cell Li+ Battery-Powered Device

RT8239BZQW Block Diagram
(Picture: Diagram)

Technical Parameters

  • Status
  • Active
  • Vs (typ) (V)
  • 19
  • Vin (min) (V)
  • 5.5
  • Vin (max) (V)
  • 25
  • Vout (min) (V)
  • 2
  • Vout (max) (V)
  • 5.5
  • Output Adj. Method
  • Resistor
  • Accuracy (+/ %)
  • 1.2
  • Freq (typ) (kHz)
  • 300
  • Freq (min) (kHz)
  • 200
  • Freq (max) (kHz)
  • 466
  • Iq (typ) (mA)
  • 1
  • Ext Sync
  • No
  • Features
  • Adjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;OVP;PSM;Power Good;SCP;UVP;Ultrasonic Mode Control
  • Package Type
  • WQFN3x3-20

RT8239BZQW Documents

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Shipping More
Estimated Delivery Time: Oct 27 - Nov 01 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 RT8239BZQW 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 RT8239BZQW devices; we pay more attention to the channels and quality of RT8239BZQW products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of RT8239BZQW chips? Including RICHTEK original factory information, Switching Regulators ; Single-Phase Step-Down Controller application, RT8239BZQW pictures?
You can use Jotrin's intelligent search engine, or filter by Switching Regulators ; Single-Phase Step-Down Controller category, or find it through Richtek Technology Corporation Information page.
Q: Are the RICHTEK's RT8239BZQW 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 RT8239BZQW, 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 RT8239BZQW?
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 RT8239BZQW we delivered, we will accept the replacement or return of the RT8239BZQW 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 RT8239BZQW.
(3)The RT8239BZQW 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 RT8239BZQW datasheet pdf, RT8239B 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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