Shenzhen Siyuan Semiconductor Co., Ltd., established in 2011, is a company developing analog-digital mixed signal integrated circuit design with independent intellectual property rights. With the core philosophy of “service, quality, innovation, and win-win,” it provides customers with comprehensive and high-quality battery management system-level chip solutions.
Siyuan Semiconductor currently focuses on five main product categories: TWS earphone charging case power management chips, mobile power SoC chips, lithium battery charging management chips, power protection chips, and interface protocol chips.
At the 2020 (Winter) Asia Bluetooth Headphone Exhibition hosted by I Love Audio Network, Siyuan Semiconductor delivered a keynote speech titled “Simplifying Power Management Design for TWS Charging Cases Facing Different Bluetooth Controllers,” pointing out that current power management solution designs for charging cases often need to be tailored according to the different Bluetooth controller chips used on the earphones during product design and development. The SY882X series charging case power management chips from Siyuan Semiconductor provide a simplified design approach to meet the needs of different Bluetooth controllers.
The Siyuan SY882X can achieve compatibility with different controller designs on a single chip, enhancing the development speed for customers facing various product projects and optimizing efficiency in product material preparation and production operations. In addition, Siyuan Semiconductor will also meet market demand by launching the Qi-standard compliant 5W wireless charging receiver SoC-SY7100 series.
After more than three years of long-term tracking and analysis, I Love Audio Network found that Siyuan Semiconductor successfully entered the supply chains of well-known brands such as 1MORE, 233621, Amazon, JBL, Meizu, Xiaomi, Motorola, OPPO, OnePlus, Soundcore, Tezo, Baidu, Transsion, and others in 2020. A total of 25 TWS earphones adopted 10 types of power chips from Siyuan Semiconductor. These 11 types of power chips can be roughly divided into three categories: intelligent charging case solutions, lithium battery charging management chips, and input over-voltage protection chips.
Below is a summary of the characteristics and teardown of Siyuan Semiconductor’s power management chips organized by I Love Audio Network. Clicking on the teardown report titles will allow you to view the complete teardown report.
Intelligent Charging Case Solutions
1. SY8810
The Siyuan Semiconductor SY8810 uses a QFN-16 package and integrates intelligent battery charge and discharge management functions along with control management functions for the charging case. The battery management functions include: switch-mode lithium battery charging management with a charging current of up to 1A, with an efficiency of up to 93%; built-in NTC temperature protection, which can achieve temperature protection for lithium batteries and segmented charging current adjustment; intelligent path management during simultaneous charge and discharge, prioritizing discharge; 5V boost discharge output current of up to 1A, with DC-DC boost efficiency optimization for TWS earphone applications, achieving 93% efficiency at 0.1A low current output; independent dual outputs ensure safety and reliability during charging of both TWS earphones with intelligent control.
The SY8810 also integrates intelligent control management functions for the charging case, including button control switch and support for HALL sensor detection for opening and closing the charging case; dual independent detection functions for earphones entering and exiting the case; automatic charging output activation when earphones are placed in the case, and automatic output shutdown to standby mode when the earphones are fully charged; multiple LED indicator UI functions supporting 1 to 4 LED light status indicators. The SY8810 greatly simplifies the product design of TWS charging cases, requiring no complex peripheral circuits; just a single chip and simple passive components are needed to achieve TWS charging case product design.
Application Cases:
(1) Teardown Report: Motorola MOTO BUDS CHARGE True Wireless Bluetooth Earphones
(2) Teardown Report: NetEase Cloud Music Oxygen True Wireless Earphones Mini Version
2. SY8803
The Siyuan Semiconductor SY8803 is a high-performance SoC-level chip designed specifically for intelligent TWS earphone charging cases, using a QFN-16 package. The SY8803 ensures high safety and reliability (with an input voltage tolerance of up to 28V and built-in full-function over-voltage, over-current, over-temperature, and short-circuit protection functions) and integrates I2C communication control functions. Through the I2C interface, the system’s MCU can read and configure the internal functions of the power supply and the battery management parameters, easily implementing functions such as NTC protection, segmented battery current adjustment, earphone entry and exit detection, and automatic power output activation.
The SY8803 chip has passed the latest IEC62368-1 safety regulation certification, providing reliable assurance for users to achieve high-quality product design requirements.
Application Cases:
(1) Teardown Report: 1MORE True Wireless Bluetooth Earphones
(2) Teardown Report: 233621 Pearl True Wireless Bluetooth Earphones
(3) Teardown Report: 233621 Zen True Wireless Noise-Canceling Earphones
(4) Teardown Report: 233621 Zen Pro True Wireless Noise-Canceling Earphones
(5) Teardown Report: realme Buds Air Pro True Wireless Noise-Canceling Earphones
(6) Teardown Report: SONG X SX06 True Wireless Bluetooth Earphones
(7) Teardown Report: Transsion TECNO Hipods H2 True Wireless Bluetooth Earphones
3. SY8801
The Siyuan Semiconductor SY8801 chip is designed for TWS earphone charging cases, ensuring safety and high reliability (supporting an input voltage tolerance of 28V and built-in full-function over-voltage, over-current, over-temperature, and short-circuit protection functions), while also integrating I2C communication and internal communication isolation functions. Through the I2C interface, the system’s MCU can read and configure the internal functions of the power supply and the battery management parameters, easily implementing functions such as NTC protection, segmented battery current adjustment, earphone entry and exit detection, and automatic power output activation.
The internal communication isolation module integrated in the SY8801 greatly optimizes the functional design of intelligent TWS charging cases, eliminating the need for complex peripheral circuits; the MCU can control the SY8801 through a connection. It can not only charge the earphones but also enable data communication through the power POGO PIN connected to the earphones, achieving functions such as uploading charging case battery status, clearing pairings within the charging case, restoring factory settings, and earphone software upgrades.
The SY8801 chip has passed the latest IEC62368-1 safety regulation certification, providing reliable assurance for users to achieve high-quality product design requirements.
Application Cases:
(1) Teardown Report: JBL LIVE PRO+ True Wireless Noise-Canceling Earphones
(2) Teardown Report: MEIZU POP2s True Wireless Bluetooth Earphones
(3) Teardown Report: OnePlus Buds Z True Wireless Bluetooth Earphones
(4) Teardown Report: OPPO Enco W51 True Wireless Active Noise-Canceling Earphones
(5) Teardown Report: Soundcore Noise-Canceling True Wireless Earphones
(6) Teardown Report: Xiaomi True Wireless Bluetooth Earphones Air2 SE
(7) Teardown Report: Baidu True Wireless Smart Earphones
4. SY7638
The Siyuan Semiconductor SY7638 is a single-chip solution IC designed for small capacity lithium battery charging/discharging applications, integrating a charging current of 0.5A (customizable to 0.25A/1A versions) switch charging management module, and a synchronous boost discharge management module with a maximum discharge current of 1.2A, built-in power MOS.
The SY7638 integrates battery level detection, LED battery display module, and button function module, providing a simple and easy-to-use solution for small capacity lithium batteries (lithium-ion or lithium-polymer). The SY7638 features customizable internal parameters, including constant current charging current, LED battery display, key function, and automatic load recognition function, making it convenient for customers to choose.
Application Cases:
(1) Teardown Report: Tezo Nutmeg True Wireless Bluetooth Earphones
5. SY7636
The Siyuan Semiconductor SY7636 is a single-chip solution designed for small capacity lithium battery charging/discharging applications, integrating a linear charging management module with a charging current of 0.4A and a synchronous boost discharge management module with a discharge current of 0.5A; the cutoff discharge current is 10mA; built-in power MOS.
The SY7636 uses SOP8 package form, integrating battery level detection, selectable control for 2/4 LED status indication module, and button function module, providing a simple and easy-to-use solution for small capacity lithium batteries (lithium-ion or lithium-polymer).
Application Cases:
(1) Teardown Report: Amazon 10.or Buds True Wireless Bluetooth Earphones
(2) Teardown Report: NetEase Cloud Music Oxygen True Wireless Earphones Lite Version
6. MP3401A
MP3401A is a single-chip solution with SOP8 packaging, highly integrating charging management module, LED battery display module, and synchronous boost discharge management module, greatly simplifying the number of peripheral circuits and components.
Application Cases:
(1) Teardown Report: LEANTS Special TWS True Wireless Bluetooth Earphones
7. MP3407
MP3407 linear charging synchronous boost IC.
Application Cases:
(1) Teardown Report: LEANTS Special TWS True Wireless Bluetooth Earphones
Lithium Battery Charging Management Chips
1. SY7612
The Siyuan Semiconductor SY7612 integrates charging and boost in a single chip, with adjustable charging current, high synchronous boost efficiency, and low static power consumption, enhancing battery life.
Application Cases:
(1) Teardown Report: Sabbat E12 Ultra True Wireless Bluetooth Earphones
2. SY7618
The Siyuan Semiconductor SY7618 supports charging while discharging, with built-in synchronous boost converter, 1A charge and discharge, and features an automatic shutdown mode.
Application Cases:
(1) Teardown Report: Creative OUTLIER AIR True Wireless Bluetooth Earphones
(2) Teardown Report: SOAIY True Wireless Bluetooth Earphones T1S
3. SY8602
The Siyuan Semiconductor SY8602 is a linear charging IC for single-cell lithium batteries with high voltage input, adopting constant current/voltage. The IC can withstand input voltages up to 28V, and to prevent excessive power consumption, the charging function will shut down when the input voltage exceeds 10V over-voltage protection threshold. The high input voltage tolerance of up to 28V eliminates the need for an input over-voltage protection circuit for low-voltage chargers.
The SY8602 internally integrates reverse charging protection circuit, eliminating the need for external isolation diodes. The built-in thermal derating control can intelligently adjust the charging current to enhance the IC’s reliability. The SY8602 is preset with 4.2V/4.35V charging float voltage, and the constant current charging current and cutoff charging current can be set through external resistors, making it especially suitable for portable products and other small lithium battery applications.
The SY8602 chip has passed the latest IEC62368-1 safety regulation certification, providing reliable assurance for users to achieve high-quality product design requirements.
Application Cases:
(1) Teardown Report: Edifier TWS NB2 True Wireless Active Noise-Canceling Earphones
Input Over-Voltage Protection Chips
1. SY8701
The Siyuan Semiconductor SY8701 input over-voltage protection chip has its over-voltage protection point set by external resistors.
Application Cases:
(1) Teardown Report: Baseus Encok WM01 True Wireless Bluetooth Earphones
Siyuan Semiconductor News Summary
(01) Siyuan Semiconductor SY8810 enters Motorola’s supply chain, bringing intelligent charging case management solutions.
(02) 2020 Siyuan TWS charging case solution analysis, summary of 15 representative audio product teardowns.
(03) Siyuan Semiconductor SY8803 TWS charging case SoC solution enters realme’s supply chain!
(04) The power management chip favored by “the King of African Phones” Transsion, Siyuan Semiconductor SY8803.
(05) Siyuan Semiconductor SY7636 TWS charging case single-chip solution enters Amazon’s supply chain.
(06) Siyuan Semiconductor SY8803 TWS charging case SoC solution enters 233621’s supply chain!
(07) Siyuan Semiconductor SY8803 TWS charging case single-chip solution adopted by 1MORE’s new fashionable bean.
(08) Siyuan Semiconductor SY8801 charging case single-chip solution enters OPPO’s supply chain, featuring rich functionality and high integration.
(09) Siyuan Semiconductor SY8801 TWS charging case solution adopted by Xiaomi, integrating I2C communication and internal communication isolation functions.
(10) Siyuan Semiconductor launches multiple TWS earphone charging case power management chips at once.
I Love Audio Network Summary
During the teardown process, I Love Audio Network discovered 11 power management chips suitable for TWS charging cases from Siyuan Semiconductor, which have been adopted by 25 TWS earphones from well-known brands such as 1MORE, 233621, Amazon, Edifier, JBL, Meizu, Xiaomi, Motorola, OPPO, OnePlus, realme, Soundcore, Tezo, Baidu, Transsion, and NetEase Cloud Music.
Among them, the Siyuan SY88xx series intelligent charging case single-chip solutions are the most popular in the market, supporting input voltage tolerance, built-in full-function over-voltage, over-current, over-temperature, and short-circuit protection functions, and also integrating I2C communication control functions, requiring no complex peripheral circuits; some models also integrate intelligent control management functions for the charging case, greatly simplifying the product design of TWS charging cases.
It is reported that Siyuan Semiconductor’s upcoming SY882X series TWS charging case SoC can achieve compatibility with different controller designs on a single chip, enhancing the development speed for customers facing various product projects and optimizing efficiency in product material preparation and production operations, while also providing excellent power performance. Siyuan Semiconductor will also launch the Qi-standard compliant 5W wireless charging receiver SoC-SY7100 series, helping brands develop TWS charging cases that support wireless charging functions. We look forward to the early mass production and application of Siyuan Semiconductor’s new products, and I Love Audio Network will bring timely teardowns and reports to everyone.
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