At MWC 2023, Realme introduced 240W charging technology on its Realme GT3, and other Chinese smartphone makers can’t be left behind. Recently, Redmi introduced a new charging technology that will break the world record again.
This morning, Redmi officially revealed its 300W charger, which can charge the entire battery 100% in just 5 minutes, 10% battery in 43 seconds, and 50% in 2 minutes. The test has been done on the Redmi Note 12 Discovery edition, which features a 4100mAh battery.
According to the official data provided by Xiaomi, the charger’s peak power can reach up to 290W, and the power above 280W can last for 2 minutes to charge the phone to 50%.
This technology adopts a self-developed 300W fast-charging architecture with a full link. It uses a customized 6:2 charge pump chip on the original device’s charging architecture, and the chip’s max conversion efficiency is as high as 98%.
Compared with the previous 4:2 charge pump chip, it eliminates the high current heating issues in the charging input path and reduces the charging temperature rise from the source. In the new 6:2 charge pump solution, multiple charge pumps adopt a decentralized layout to effectively avoid concentrated heat generation and prolong the duration of high-power charging.
It is worth mentioning that this Redmi’s 300W charger is based on a dual-string battery design. The input current of the battery cell is as high as 30A, which requires the battery cell to have an ultra-high charging rate of 15V.
To prevent this, Xiaomi introduced a new type of hard carbon material in mobile phone batteries. Compared with graphite material, the new rugged carbon structure is looser and disordered, which can provide a more relaxed reaction path for lithium ions.
Overall, the 300W charging solution is a significant upgrade. It adopts a fourth-generation GaN integration solution that supports high power, is small in size, has lower heat generation, and has higher efficiency.
For heat dissipation purposes, the 300W charger features a large-area grapheme to achieve ultra-high power output while also providing. Xiaomi also revealed that with a 43% increase in power, its volume is exactly the same as Xiaomi’s previous generation 210W charger.
Currently, the 300W charging is limited to testing only.