Includes a fast-charging architecture for ultra-fast charging in flagship smartphones and other mobile devices
Now, the 2nd gen charge pump fast charging IC, the NU2205 from NuVolta Technologies aims to improve that with the one-of-its-kind 100W charge pump fast charging IC that is optimal for 2S battery with 4:2 charge pump fast-charging architecture for ultra-fast charging applications in flagship smartphones and other mobile devices. The innovative 2S battery fast charging architecture enables the charging power from 60W to 120W, which can be further increased to 200W.
High efficiency is the most critical parameter in fast-charging applications. The NU2205 not only improves the work efficiency through the internal innovative structure but also can adjust the efficiency through the operating frequency. In the 4:2 mode, the highest efficiency can reach 98%. Under the 10V AC-DC adaptor input, the charging efficiency of the 2S battery in the 2:2 mode can reach up to 99.2%. In high power charging application, it provides the possibility of pulse switching between 4:2 and 2:2 modes to reduce the heat of the system. The NU2205 can also support both 2:1 and 1:1 1S battery fast charging modes.
When the internal resistance of the battery is only 5mΩ, the power loss exceeds 0.7W. Higher current brings more heat that induces huge challenges to the design of the battery protection board and the internal resistance of the battery cell. Since the resistance of MOSFET has been reduced from 5mΩ to 1.1mΩ to meet the application of fast charging and high current, the 1S battery fast charging encounters the charging power limitation. To overcome this challenge, the 2S battery fast charging solution doubles the battery voltage at the charging output terminal, reducing the current into the battery by half at the same charging power and bringing down the battery heat to 25%.
此外，NU2205支持收费。当两个NU2205 IC并行使用时，电荷泵IC将输出120W功率。当三个NU2205 IC并行时，充电能力超过200W。
In high-power charging applications, efficiency and heat are the most important considerations. Another important consideration is charging safety. NU2205 integrates up to 34 levels of safety protections, such as protections of input and output voltage and current, battery voltage and current, and temperature, etc. That protects the system and prevents abnormal conditions that damage the battery and system.