After Huawei was restricted, domestic mobile phone manufacturers have embarked on the road of self-developed chips, image chips, this year there are three, at the beginning of the year Xiaomi's surging C1, some time ago vivo v1, the recent OPPO Mariana X, in addition to the image chip, Xiaomi today has brought a power management chip, surging P1, the emergence of this chip is likely to once again promote the development of mobile phone fast charging.
What is the surging P1 for? Simply put, it is designed to achieve a 120W single cell design.
At present, 120W fast charging mobile phones are using a series of double cell scheme, this scheme after more than a year of use, will find that its battery capacity limit is only 4500mAh, in addition to about 6.7 inches of mobile phones, dual cells in the same volume, the capacity is less than a single cell about 4000mAh, after conversion is less than nearly 1 hour of battery life.
Another point is that in terms of a normal 5V battery, the dual battery will output a 10V voltage, so the mobile phone also needs a buck chip to reduce it back to 5V, and in the process will bring 4% loss.
So want a large battery, reduce the loss but also have a single cell program, the existing 100W single cell scheme, the need to connect multiple charge pumps, this scheme heat is very large, will lead to a short time to full load, and it seems to be unable to do 120W, otherwise it can not only be 100W.
In order to solve the problem of multi-charge pump heat generation, Xiaomi began to develop its own charging chip, it is understood that this project began after the Xiaomi 120W dual-cell program landed, the process was not smooth, but finally used two surging P1 to replace the multi-charge pump, to achieve a single-cell fast charge of 120W, but theoretically speaking, the single-cell charging speed may not be as fast as the double-cell. So finally let's guess what the battery capacity of the Xiaomi Mi 12Pro is, 4500 guess up.