At MWC 2023, Realme introduced 240W charging technology on the 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 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 was conducted on the Redmi Note 12 Explorer Edition, which has a 4100 mAh battery.
According to Xiaomi data, this charger can reach a peak power of 290W, and when the charging power exceeds 280W, it can charge the phone to 50% in just 2 minutes.
This technology uses a self-developed 300W full-link fast-charging architecture, employing a custom 6:2 boost pump chip on the original device charging architecture, with a maximum chip conversion efficiency of up to 98%.
Compared to the previous 4:2 charge pump chip, this solution eliminates the high current heating issue in the charging input path and reduces the temperature rise at 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 300W charger uses 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 hard carbon material in its mobile phone batteries. Compared with graphite, the new rugged carbon structure is looser and disordered, providing 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.