Application of power IC in mobile phones

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Application of power IC in mobile phones

Mobile phones are the most important applications for power management ICs. Multimedia and 3G mobile phones continue to increase demand for high-definition video, multimedia data streaming, audio playback, clearer display and more entertainment, but these features consume a lot of power, most of which are not the same. As current demands continue to increase, they require more power, such as upgrading from 2G voice telephony to 3G video telephony, doubling power requirements. In the same mobile phone to integrate more diverse functions, its power consumption will also increase, which is a clear trend in the future development of power management chips.

LDOs use LDOs to power all parts of mobile phones. LDOs have low conversion efficiency, low package size, low peripheral components and low noise. However, they have low conversion efficiency and can only be used in buck applications, plus LDO. Efficiency depends on the ratio of output to input voltage. When the input voltage is 3.6V and the output voltage is 1.5V, the efficiency is only 41.7%. This low efficiency will not only waste a lot of power when the output current is large, but also Causes chip heat to affect system stability. The components of the 3G mobile phone require multiple voltage levels of power supply. In many cases, especially when the voltage difference is large, the LDO has been difficult to meet the power supply requirements, so the DC/DC solution becomes a solution to replace the LDO.

The advantages of DC/DC conversion are both high and low, and high efficiency. At present, there are automatic PFM/PWM mode and DC/DC+LDO dual mode power management solution, although the cost of any solution will be high. In LDO, it can solve the problem of LDO inefficiency and can only be used for voltage reduction. The increase of 3G mobile phone production and the improvement of mobile phone power management function will stimulate the development of mobile phone power management IC market to some extent.

Power supply ic high current / low output voltage application

Since the clock of the digital chip is getting faster and faster, it means that the drive current is getting bigger and bigger. In the past, only the linear voltage regulator was needed. Now, switching regulator is needed. In the past, only one phase power supply was needed. Now, two or more phase power supplies are needed. . In addition, because the CPU is getting faster and faster, heat dissipation has become a bottleneck for its development. Therefore, with multi-core technology, Intel is already planning 80 core CPUs, which require higher power requirements.