Designed specifically for 30W mobile power supplies, Shanghai Nanchip Semiconductor Technology Co., Ltd. (stock code: 688484) officially launched the fully integrated synchronous bidirectional buck-boost charging management chip SC8911 in late March 2025. This device, tailored for portable energy storage applications, is an integrated power management IC specifically for two-series battery setups. It features a new design architecture that optimizes efficiency and provides a reliable power management solution for 30W mobile power applications, facilitating the transition of low-power mobile power supplies from 22.5W to 30W.
Multiple technological breakthroughs build core competitiveness
The SC8911 chip is meticulously designed for common 30W power bank applications with two-series batteries and is equipped with an I2C interface. Its design significantly reduces the temperature increase in the power bank casing, ensuring a safe and efficient charging experience for users. The chip supports OTG reverse boost functionality and is compatible with various charging modes including trickle charging, pre-charging, constant current charging, constant voltage charging, and automatic termination. It perfectly aligns with current mainstream PD and UFCS protocols, helping customers achieve higher efficiency, lower costs, and smaller sizes.
Highly integrated architecture eliminates external MOSFET design
The SC8911 departs from traditional buck-boost controllers that rely on external MOSFETs. Instead, it incorporates a highly integrated structure that embeds three NMOS driver modules within the chip. This design effectively addresses the efficiency bottlenecks associated with external wiring, enhancing the drive speed and improving overall system performance.
Excellent energy efficiency easily adapts to various operating conditions
According to official data from Nanchip Technology, thanks to the built-in power transistor design of the SC8911, the chip can achieve a switching rate exceeding 4V/ns and reach a peak efficiency of 97.6% under typical conditions. Even under stringent conditions with a battery voltage of 6V and an output of 20V/1.5A, it maintains a system efficiency of 93.5%, with the PCBA temperature kept below 69°C, demonstrating a significant improvement in energy efficiency compared to similar products.
Optimized packaging and layout enhance EMI and heat dissipation
On the other hand, the built-in power transistors ensure that the driver and power circuit paths are sufficiently compact. The package pin design considers the ease of placing input and output capacitors, which not only guarantees high switching speeds but also effectively tackles EMI challenges, making PCB layouts more user-friendly. Additionally, the SC8911 adopts a 4mm x 5mm QFN-27 flip chip package, allowing heat generated from internal power loss to be directly dissipated to the PCB via copper pillars, greatly enhancing the chip’s thermal performance.
Flexible input voltage and precise control meet diverse demands
The SC8911 supports charging and discharging modes within an input voltage range of 4.4V to 21V, with a static current of only 50μA in standby mode, and as low as 5μA in transport mode, demonstrating exceptional energy efficiency. The chip supports three adjustable switching frequencies of 240kHz, 360kHz, and 480kHz, balancing efficiency and EMI according to different application needs. Voltage regulation precision reaches ±0.5%, and in OTG reverse output mode, it can achieve a voltage fine-tuning of 10mV, fully meeting the precise voltage requirements of terminals.
Multiple detection and protection mechanisms ensure charging safety
Ensuring charging safety is one of the core aspects of charging management chip design. The SC8911 integrates a comprehensive monitoring and protection mechanism that can continuously detect key parameters such as input current, voltage, battery voltage, current, output current, and chip junction temperature. Combined with over-voltage protection, short-circuit protection, cycle-by-cycle current limiting, and thermal shutdown mechanisms, it guarantees charging safety and system stability across various usage scenarios.
Summary
The SC8911, as the latest offering from Nanchip Technology, not only represents an evolution in efficiency, safety, and system integration, but also provides a smarter and more reliable solution for portable energy storage devices such as mobile power banks. With its highly integrated architecture, superior energy efficiency, and precise control capabilities, this chip is expected to play a crucial role in the upgrade of low-power fast charging products.
