Products > Integrated Circuits (ICs) > Amplifier ICs > RT5509WSC
  • RT5509WSC
  • RT5509WSC 0
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Audio Power Amplifier, 4.3 W, D, 1 Channel, 1.71V to 2V, WLCSP, 48 Pins

Manufacturer :
Richtek Technology Corporation
Package/Case :
Product Categories :
Linear - Amplifiers - Audio
RoHs Status:
Lead free / RoHS Compliant

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RT5509WSC Product Details

The RT5509WSC is a mono BTL class-D amplifier with cutting-edge speaker protection algorithm. Also, a built-in DC-DC step-up converter is used to provide efficient power for class-D amplifier. I2S interface supports two different audio sources while a pair of auxiliary DATAI/O is used for stereo mode or pass-through application. Chip information including gain, speaker protection output or current sense is able to be monitored via DATAO through proper register setting. Speaker protection provides mechanical / thermal protection with accuracy of 10%/±10ºC of rated limit.


  • Class-D Speaker AMP► 4.3W Output Power @ 9.5V, 8Ω Load, THD < 1%► 0/3/6/9/12/15/18dB Boost Gain► 20μV Output Noise @ 0dB Gain
  • Boost Converter► Adaptive Boost for Speaker, Boost from Battery Supply Up to Programmed Voltage, Max 9.5V► Power Modes : Adaptive Boost, Fixed Boost, Bypass Mode► Switching Frequency 2MHz, Maximum Output Current 1.5A► Support CCM / DCM Compensation, Feedback AD► Digital Part : Voltage Loop in Boost Mode
  • Digital► Digital Audio Interface Support I2S, Left-Justified, Right-Justified► I2S Sampling Rate Support Up to 48kHz, 24-bit► Digital Filter, Digital Volume, DRC/Noise Gate► Speaker Protection► Speaker Amplitude Estimation Accuracy : Error < 10% ► Bl Calibration Function► Temperature Sensing► Speaker Temperature Estimation Accuracy : Error < ±10ºC


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RT5509WSC Block Diagram
(Picture: Diagram)

Technical Parameters

Type Class D Features I2C, I2S, Mute, PWM, Short-Circuit and Thermal Protection, Volume Control
Output Type 1-Channel (Mono) Mounting Type Surface Mount
Max Output Power x Channels @ Load 4.4W x 1 @ 8Ohm Operating Temperature -40??C ~ 85??C (TA)
Voltage Supply 1.71V ~ 2V Package / Case 48-UFBGA, WLCSP

RT5509WSC Documents

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Estimated Delivery Time: Jan 29 - Feb 03 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
Wire Transfer

charge US$30.00 banking fee.


charge 4.0% service fee.
Credit Card

charge 3.5% service fee.

Western Union

charge US$0.00 banking fee.
Money Gram

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


  • 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.


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 RT5509WSC 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 RT5509WSC devices; we pay more attention to the channels and quality of RT5509WSC products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of RT5509WSC chips? Including RICHTEK original factory information, Linear - Amplifiers - Audio application, RT5509WSC pictures?
You can use Jotrin's intelligent search engine, or filter by Audio ; HV Audio Amplifier category, or find it through Richtek Technology Corporation Information page.
Q: Are the RICHTEK's RT5509WSC 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 RT5509WSC, 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 RT5509WSC?
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 RT5509WSC we delivered, we will accept the replacement or return of the RT5509WSC 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 RT5509WSC.
(3)The RT5509WSC 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 RT5509WSC datasheet pdf, RT5509 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, Rich...

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