Xiaomi released the third self-developed chip Surging P1. Lei Jun said that the Mi 12 Pro is equipped with the surging P1 charging chip, the industry’s first realization of “120W single-cell” charging technology.
Moreover, Xiaomi has now released a detailed introduction of the surging P1. The official said that the surging P1 has filled the gap in the 120W single-cell fast charging industry.
Xiaomi said that in the past single-cell fast-charging system, to convert the 20V voltage input into the mobile phone into a 5V voltage that can be charged into the battery, a series-parallel circuit of 5 different charge pumps is required.
A large number of charge pumps and an overall series-connected structure will generate a lot of heat. In actual use, it is impossible to achieve full-power operation for a long time, and it is even more difficult to achieve 120W high-power fast charging.
The core of driving Xiaomi’s 120W surging second charge is two Xiaomi self-developed smart charging chips: surging P1. They take over the complex structure of the traditional 5 charge pump and convert the high-voltage power input to the mobile phone into a large current that can be directly charged to the battery more efficiently.
Xiaomi said that as the industry’s first resonant charging chip, Surging P1 has an ultra-high efficiency architecture of 4:1 with adaptive switching frequency. The efficiency of the resonant topology is as high as 97.5%, the efficiency of the non-resonant topology is 96.8%, and the heat loss has plummeted by 30%.
Furthermore, Surging P1 itself undertakes a lot of conversion work: traditional charge pumps only need two working modes (transformation, pass-through), while Surging P1 needs to support 1:1, 2:1, and 4:1 conversion modes, and all modes are needed to support two-way conduction, which means a total of 15 permutations and combinations of mode switching control-7 times that of traditional charge pumps.
The forward 1:1 mode makes the bright screen charging more efficient, the forward 2:1 mode is compatible with more chargers, the forward 4:1 can support 120W surging seconds, and the reverse 1:2/1:4 mode is available to support high-power reverse charging.
According to Xiaomi, Surging P1 is also Xiaomi’s highest charging efficiency 4:1 charging chip, which can achieve an ultra-high power density of 0.83W / mm², and LDMOS has also reached the industry’s leading ultra-low 1.18mΩmm² RSP. The surging P1 chip needs three different FLY capacitors with different voltage resistance.
Each capacitor needs an independent open and short circuit protection circuit, and each working mode needs to strictly control the precharge voltage, and the number of power tubes is close to two of the traditional charge pumps. Because of the increase in topology design and functional complexity, each surging P1 needs to pass more than 2500 tests before leaving the factory, which is much higher than the traditional charge pump.
Besides, Mi 12 Pro, which will be released on December 28, is the first smartphone equipped with Surging P1. It supports wired 120W Surging Second Charge, 50W Wireless Second Charge, and 10W Wireless Reverse Charging.
According to Xiaomi,” the 120W surging second charging technology of the Mi 12 Pro has two modes: low-temperature mode, “the temperature is only 37 degrees Celsius, and the body temperature is comfortable”; the fast mode, “a cup of coffee is quickly fully charged”.