IT home February 8 news, Nanxin Semiconductor today issued an article saying that there have been some false rumors about Xiaomi surging P1 in recent days. The official response is now available.
According to reports, the Xiaomi surging P1 chip is designed by Xiaomi itself and oem by Nanxin Semiconductor (internal code name SC8561). The chip has an ultra-high voltage 4:1 charging architecture, which realizes 120W single-cell charging, supports 1:1, 2:1 and 4:1 conversion modes, all modes can be dual-guided, and can realize wired 120W, wireless 50W, wireless reverse charging and other charging functions.
Earlier today, some Weibo users said that Xiaomi's self-developed surging P1 chip was rumored to be purchased externally, and rumors were made about Xiaomi's "self-research" work.
Xiaomi released its third self-developed chip, the Surging P1, in December last year. Lei Jun said that the Xiaomi Mi 12 Pro is equipped with a surging P1 charging chip, and the industry has realized the "120W single-cell" charging technology for the first time.
Xiaomi has now released a detailed description of the surging P1, and the official said that the surging P1 fills 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 to the mobile phone into a 5V voltage that can be charged into the battery, it requires 5 different kinds of charge pump series parallel circuits. A large number of charge pumps and the overall series of architecture will bring a lot of heat, in actual use can not achieve a long time full power operation, it is more difficult to achieve 120W high power fast charging.
Driving the core of the Xiaomi Mi 120W surging second charge is two Xiaomi self-developed smart charging chips: the surging P1. They take over the traditional 5-charge pump complex structure, converting the high-voltage power input into the phone's high-voltage power more efficiently into a large current that can be directly charged to the battery.
Xiaomi said that as the industry's first resonant charging chip, the surging P1 has a 4:1 ultra-high efficiency architecture with adaptive switching frequency, with a resonant topology efficiency of up to 97.5%, a non-resonant topology efficiency of 96.8%, and a plummeting thermal loss of 30%.
The P1 itself takes on a lot of the conversion work: the conventional charge pump only needs two operating modes (variable pressure, pass-through), while the surging P1 needs to support 1:1, 2:1 and 4:1 conversion modes, and all modes need to support two-way guide, which means that a total of 15 permutation combinations of mode switching control are required - 7 times that of traditional charge pumps. Forward 1:1 mode makes bright screen charging more efficient, forward 2:1 mode can be compatible with more chargers, forward 4:1 can support 120W surging seconds charge, reverse 1:2/1:4 mode can support high power reverse charging.
Xiaomi said that the surging P1 is also Xiaomi's highest charging efficiency 4:1 charging chip, which can achieve 0.83W/mm ultra-high power density, and LDMOS also reaches the industry-leading ultra-low 1.18mΩmm RSP. The surging P1 chip needs to use three different kinds of FLY capacitors with different withstand voltages, each capacitor requires an independent open-short circuit protection circuit, and each operating mode needs to strictly control the precharge voltage, and the number of power tubes is nearly twice that of the traditional charge pump. And because of the increased topology design and functional complexity, each surging P1 needs to pass more than 2500 tests at the factory, which is much higher than the traditional charge pump.
IT Home has learned that the Xiaomi Mi 12 Pro, which will be released on December 28, is the first smartphone equipped with the surging P1, which supports wired 120W surging second charge, 50W wireless second charge and 10W wireless reverse charging. Xiaomi said that the Xiaomi Mi 12 Pro's 120W surging second charge technology has two-stop mode: low temperature mode, "temperature is only 37 ° C, body temperature is as comfortable"; speed mode, "a cup of coffee time fast full power".