SW3556, multi-protocol dual-C port 140W

The SW3556 from Zhirong is a buck controller chip with dual USB-C ports and built-in multi-fast charging protocols. It supports dual-port blind insertion and independent current limiting for both ports. The built-in synchronous buck converter supports 7A high-current output and uses gallium nitride (GaN) switches for smaller size and higher efficiency. It supports a wide range of fast charging protocols, including custom proprietary fast charging protocols, supporting 20V 7A 140W output and 3.3-21V 6A PPS fast charging output, fully meeting the charging needs of modern mobile phones and high-power devices. The SW3556 uses a synchronous rectification buck topology, supports 40V input, and features a built-in synchronous rectification buck controller. Combined with silicon MOSFETs or GaN switches, inductors, and capacitors, it can achieve 140W high-power output. The built-in buck controller has a switching frequency of 125kHz and supports PFM/PWM modes to optimize conversion efficiency. The SW3556 includes output line loss compensation, supports independent current limiting for both output ports, and supports overheat power reduction and overheat shutdown functions. The chip supports external resistors on the pins to configure output power and dynamic power distribution, eliminating the need for an external microcontroller for multi-port output configuration. The SW3556 adds an input voltage regulation function, reducing the input voltage when no device is connected, thereby reducing overall power consumption and meeting higher energy efficiency requirements. The SW3556 has a built-in 12-bit ADC, supporting input voltage, output voltage, USB-C1 and USB-C2 output current, and temperature acquisition. Microcontrollers can read chip parameters and display the operating status in real time. It uses a QFN4*4-28 package, offering enhanced functionality while maintaining the same package size. It can be used in multi-port high-power PD chargers and car chargers. Furthermore, the Zhirong synchronous buck converter supporting fast charging protocols has been adopted by many well-known brands such as Ugreen, Nubia, ZENDURE, Pisen, ASUS, and Lenovo. It not only supports high-power mobile phone fast charging but also gallium nitride applications; utilizing the high-frequency and high-efficiency advantages of third-generation semiconductors, it replaces traditional MOSFETs, achieving a smaller size and higher efficiency. While saving energy and reducing carbon emissions, it also reduces product size and improves product competitiveness.