Nanchip Technology Launches SC8911 Bi-Directional Boost-Buck Chip Designed for 30W Power Banks

Nanjing Semiconductor Technology has launched the SC8911, a synchronous bidirectional buck-boost charging management chip designed specifically for 30W mobile power supplies. This product was officially introduced in late March 2025 and is aimed at portable energy storage devices.

As an integrated power management IC dedicated to 2-series battery applications, the SC8911 employs an innovative design architecture that provides an efficient, safe, and reliable power management solution for 30W mobile power applications. This advancement facilitates the transition of low-power mobile power supplies from 22.5W to 30W.

Technological Breakthroughs Enhance Core Competitiveness

The SC8911 chip has been meticulously crafted for the common 30W power bank applications with 2-series batteries. It features an I2C interface and has undergone extensive efficiency optimization. This design significantly reduces the temperature rise of the power bank’s casing, ensuring a safe and efficient charging experience for users. The chip also supports OTG reverse boost functionality, along with compatibility for various charging modes such as trickle charging, pre-charging, constant current charging, and constant voltage charging. It is fully compatible with current mainstream PD and UFCS protocols, helping customers achieve higher efficiency, lower costs, and more compact designs.

Highly Integrated Architecture Eliminates External MOSFETs

The SC8911 departs from the traditional design of buck-boost controllers that rely on external MOSFETs. Instead, it incorporates a highly integrated structure that embeds three NMOS driver modules within the chip itself. This design effectively addresses efficiency bottlenecks caused by external wiring and enhances drive speed, resulting in improved overall system performance.

Excellent Energy Efficiency Adapts to Various Operating Conditions

According to official data from Nanjing Semiconductor Technology, the SC8911 achieves a switching speed exceeding 4V/ns due to its built-in power transistors. Under typical conditions, it can achieve a peak efficiency of 97.6%. Even under stringent conditions, such as a battery voltage of 6V and an output of 20V/1.5A, the system maintains an efficiency of 93.5%, with the PCBA temperature kept below 69℃. This performance represents a significant improvement over similar products.

Optimized Packaging and Layout Enhance EMI and Thermal Management

The integration of the power transistors minimizes the distance of the drive and power circuit paths. The pin design of the package has been optimized for the convenient placement of input and output capacitors. This not only ensures high switching speeds but also effectively addresses EMI challenges, allowing for a more friendly PCB layout. Additionally, the SC8911 utilizes a 4mm x 5mm QFN – 27 Flip Chip package that enables heat generated by the internal power losses to be directly conducted to the PCB, greatly enhancing the chip’s thermal performance.

Flexible Input Voltage and Precise Control to Meet Diverse Needs

The SC8911 supports input voltages ranging from 4.4V to 21V, with a static current of just 50μA in standby mode and as low as 5μA in transportation mode, showcasing excellent energy efficiency. The chip also features three adjustable switching frequency settings at 240kHz, 360kHz, and 480kHz, catering to varying application requirements for efficiency and EMI. Voltage regulation accuracy reaches ±0.5%, and in OTG reverse output mode, it allows for a 10mV voltage fine-tuning, meeting the precise voltage level requirements of end devices.

Comprehensive Detection and Protection Mechanisms Ensure Charging Safety

Safety remains a core focus in the design of charging management chips. The SC8911 integrates comprehensive monitoring and protection features, enabling real-time detection of input current, voltage, battery voltage, current, output current, and chip junction temperature. Coupled with over-voltage protection, short-circuit protection, cycle-by-cycle current limiting, and thermal shutdown mechanisms, it ensures charging safety and system stability across various usage scenarios.

Conclusion

The SC8911 from Nanjing Semiconductor Technology is a state-of-the-art fully integrated bidirectional buck-boost charging management chip that has made significant advancements in efficiency, safety, and system integration. It offers a more intelligent and reliable solution for portable energy storage devices like mobile power supplies. With its highly integrated architecture, superior energy efficiency, and precise control capabilities, the SC8911 is poised to play a crucial role in the upgrade of low-power fast charging products.