At present, the 5W handheld interphone mostly work with two batteries. In order to meet the requirements of transmitting power and distance, the solution provider will chose the RF power transistor such as HTL7G06S006P of Huatai Which works at 7.4V and can provide 5W output power.
In some scenarios, it is attractive that one lithium battery can supply the 5W output power. However, the RF power transistors that can meet the 5W output power under the 4V operating voltage are very scarce at present. So, according to the needs of many customers, Huatai has developed the RF power transistor HTU7G06S005P for this requirement and filled this gap.
Huatai provides the 4V 5W two-stage cascaded solution for handheld interphone, whose frequency range is 400-440MHz and efficiency is close to 60%.