At MWC 2023, Realme introduced 240W charging technology on its Realme GT3, and other Chinese smartphone manufacturers are not far behind. Recently, Redmi unveiled a new charging technology that will break the world record again.
This morning, Redmi officially released its 300W charger, which can charge the battery to 100% in just 5 minutes, charge 43% in 10 seconds and charge 50% in 2 minutes. The test has been done on the Redmi Note 12 Discovery Edition, which has a 4100mAh battery.
According to official data provided by Xiaomi, the charger’s peak power can reach up to 290W, and charging above 280W can charge the phone to 50% in just 2 minutes.
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 maximum conversion efficiency reaches 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 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 uses a fourth-generation GaN integration solution.
Currently, the 300W charging is limited to testing only.
