Recently, the charging head network learned that saineng microelectronics, a manufacturer in the industry, has designed a mini 20W PD fast charging based on the s1109s scheme. The size of PCBA module is only 28 * 25 * 24mm, which is very compact. In addition, it cooperates with the well-known large manufacturer hailutong to realize the mass production and listing of products, and supports the full mainstream fast charging agreement on the market, which not only meets the needs of consumers for mini charging, but also is quite practical. Let's see how the product is doing.It is worth mentioning that Mr. Tang shunbai, the founder of Shenzhen saineng Microelectronics Co., Ltd., is the former general manager of Italian French semiconductor Shenzhen design center and is now a visiting professor and graduate tutor of Shenzhen University. Founded in 2008, 2018 and 2019 respectively, Yichong microelectronics, saineng microelectronics and Shandong haishengnick microelectronics were founded. Mainly engaged in digital, analog and digital analog hybrid integrated circuit design, R & D, packaging, testing and sales. It is positioned as an IDM (Design + manufacturing) semiconductor company in the special field.It is understood that saineng micro has launched a series of fast charging master controllers, of which s1108sa constant voltage and s1008sa constant power series mainly focus on 18W fast charging market, s1109s constant voltage and s1009s constant power series mainly focus on 20W and 22.5w fast charging market, and s1139n constant voltage and s1039n constant power series mainly focus on 25-30w fast charging series. Among them, s1139n and s1039n adopt dfn5 * 6 package with better heat dissipation. After consulting relevant specifications, the VCC voltage of the whole series of fast charging main control IC of saineng micro is 9-41v, which is very suitable for the change of output voltage of 3.3-12v.The mini 20W fast charge, which is mass produced and listed with the help of hailutong, has a final overall size of 32 * 31 * 31mm. It is very compact. In addition to the ingenious stacking structure design, it also benefits from the use of saineng micro s1109s highly integrated fast charge chip. Its built-in MOS tube can greatly simplify the circuit and save space.According to the rated output power of 20W, the power density of this charger is 0.65w/cm 3， The power density of traditional chargers is generally only 0.3w/cm 3 In other words, the 20W fast charging volume designed based on the saineng micro fast charging scheme has been reduced by half, which can fully meet the needs of consumers for mini fast charging.In addition, the charger protocol chip adopts Zhirong sw2303, which makes this charger compatible with QC, AFC, FCP, SCP, pe2.0, pd3.0, PPS and other mainstream fast charging protocols in the market. It can not only meet the fast charging of iPhone 12 20W, but also meet the fast charging of domestic well-known brands such as Huawei and Xiaomi, with practical performance.