Products > Integrated Circuits (ICs) > RT8078AZQW
  • RT8078AZQW

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4A, 1MHz, Synchronous Step-Down Converter

  • Package/Case :
  • QFN
  • Product Categories :
  • Switching Regulators ; DC_DC StepDown Convertor
  • RoHs Status:
  • Lead free / RoHS Compliant
  • In-stock:
  • 1479


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RT8078AZQW Product Details

General Description
The RT8078AZQW is a high efficiency synchronous, step-down DC/DC converter. It's input voltage range from 2.7V to 5.5V
that provides an adjustable regulated output voltage from 0.6V to VIN while delivering up to 4A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for an external Schottky diode. The switching frequency is fixed internally at 1MHz. The 100% duty cycle provides low dropout operation, hence extending battery life in portable systems. Current mode operation with internal compensation allows the transient response to be optimized over a wide range of loads and output capacitors.
The RT8078AZQW is operated in PWM mode to achieve high efficiency for a wide load range. The RT8078AZQW is available in WDFN-10L 3x3 and SOP-8 (Exposed Pad) packages.

· High Efficiency: Up to 95%
· Fixed Frequency:1MHz
· No Schottky Diode Required
· Internal Compensation
·0.6V Reference Allows Low Output Voltage
· PWM Mode Operation
· Low Dropout Operation:100% Duty Cycle
· RoHS Compliant and Halogen Free

· Portable Instruments
· Battery Powered Equipment
· Notebook Computers
· Distributed Power Systems
· IPPhones
· Digital Cameras


  • High Efficiency : Up to 95%
  • Fixed Frequency : 1MHz
  • No Schottky Diode Required
  • Internal Compensation
  • 0.6V Reference Allows Low Output Voltage
  • PWM Mode Operation
  • Low Dropout Operation : 100% Duty Cycle
  • RoHS Compliant and Halogen Free


  • Portable Instruments
  • Battery Powered Equipment
  • Notebook Computers
  • Distributed Power Systems
  • IP Phones
  • Digital Cameras

RT8078AZQW Block Diagram
(Picture: Diagram)

Technical Parameters

  • Status
  • Active
  • Vin (min) (V)
  • 2.7
  • Vin (max) (V)
  • 5.5
  • Number of Outputs
  • 1
  • Vout (min) (V)
  • 0.6
  • Vout (max) (V)
  • 5.5
  • Output Adj. Method
  • Resistor
  • Iout (max) (A)
  • 4
  • Current Limit (typ) (A)
  • 4.4
  • Freq (typ) (kHz)
  • 1000
  • Ext Sync
  • No
  • Ron_HS (typ) (mOhm)
  • 69
  • Ron_LS (typ) (mOhm)
  • 49
  • Iq (typ) (mA)
  • 0.11
  • Features
  • 100% Duty Cycle;Current Mode Control;Enable Input;Fast Transient Response;Internal Compensation;OCP;Power Good;Stable with Ceramic Capacitor;UVP
  • Package Type
  • WDFN3x3-10

RT8078AZQW Documents

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  • **LENI***

    Wie immer alles ok

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Shipping More
Estimated Delivery Time: Dec 14 - Dec 19 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 RT8078AZQW 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 RT8078AZQW devices; we pay more attention to the channels and quality of RT8078AZQW products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of RT8078AZQW chips? Including RICHTEK original factory information, Switching Regulators ; DC_DC StepDown Convertor application, RT8078AZQW pictures?
You can use Jotrin's intelligent search engine, or filter by Switching Regulators ; DC_DC StepDown Convertor category, or find it through Richtek Technology Corporation Information page.
Q: Are the RICHTEK's RT8078AZQW 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 RT8078AZQW, 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 RT8078AZQW?
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 RT8078AZQW we delivered, we will accept the replacement or return of the RT8078AZQW 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 RT8078AZQW.
(3)The RT8078AZQW 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 RT8078AZQW datasheet pdf, RT8078A pin diagram?
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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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