button battery 2025

　　Mobile phone overall power management technology and its solutions

　　As mobile phones have more and more functions, users have higher and higher energy demands for mobile phone batteries. It is increasingly difficult for existing lithium-ion batteries to meet consumers' requirements for normal use time. In this regard, the industry mainly adopts two methods. One is to develop new battery technologies with higher energy density, such as fuel cells; the other is to work hard on the energy conversion efficiency and energy saving of batteries.

　　Although there have been many innovations and developments in the technology for providing power to mobile phones in recent years, it is still far from meeting the needs of the development of mobile phone functions. Therefore, how to improve power management technology and extend battery life has become a major issue in mobile phone development and design. One of the challenges.

　　The time allocation ratio of a fully functional mobile phone during normal operation is roughly as shown in Figure 1:

　　In addition, there are many other functions that consume power. This amount of power consumption is undoubtedly huge for a mere 900mAH battery. Therefore, when the current new battery technology is not mature enough, if you want to extend the working time of your mobile phone as much as possible, you can only make a fuss about power management.

　　However, designers must first understand consumers' requirements for mobile phones, which are mainly reflected in the following aspects: First, small size. This requires increasing the integration level of the system, reducing the packaging volume of components, and reducing the area of the PCB board, which may increase the difficulty of solving electromagnetic interference (EMI) in the design. Second, it is lightweight. It is required to use high-efficiency batteries to increase the energy density of batteries within limited volume and weight. Currently, most mobile phones use single-cell lithium-ion or lithium-polymer batteries with a capacity of 850~1000mAH. Third, the call time is long. It is required to improve the conversion efficiency of electric energy in the battery during operation, reduce the leakage current during standby, and improve the usage efficiency. Fourth, the price is cheap. The product solution is required to have high integration, few discrete components and low cost. Fifth, product updates are fast. The components are required to be simple and easy to use, easy to design and use, and the hardware and software platforms are unified to facilitate the addition of new functions and features.

　　Therefore, the power management of mobile phones must be comprehensively considered when designing mobile phone system solutions, balancing multiple factors such as power saving, cost, volume, and development time to make the best choice. Generally speaking, the overall power management of mobile phones can be carried out from two aspects: improving the conversion efficiency of electric energy and improving the efficiency of using electric energy.

　　1. Improve the conversion efficiency of electrical energy

　　With the continuous improvement of power management requirements, power conversion in handheld devices has gradually moved from linear power supplies to switching power supplies. But not switching power supplies can replace everything. Both have their own advantages and disadvantages and are suitable for different occasions.

　　Linear power supply - LDO (low dropout regulator)

　　LDO has the characteristics of low cost, small package, few peripheral components and low noise. When the output current is small, the cost of the LDO is only a fraction of that of the switching power supply. LDO packages range from SOT23 to SC70, QFN, and up to WCSP (wafer level chip packaging), which is very suitable for use in handheld devices. For fixed voltage output applications, only 2 to 3 small external capacitors are needed to form the entire solution.

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