Mobile terminal and its power management chip output voltage control method and system

Abstract

The invention discloses a control method and system for output voltage of a mobile terminal and a power supply management chip thereof. The method comprises the following steps: an adjustable resistor is connected between each voltage output end of the power supply management chip of the mobile terminal and a functional chip power supply end in series; needed working voltage for opening a functional chip is obtained, and output voltage which has the smallest difference with the working voltage needed by the functional chip is found to be used as current output voltage; the resistance value of the adjustable resistor which is connected with the opened functional chip in series is controlled and adjusted so that the actual voltage to the opened functional chip, which is output by the voltage of the power supply management chip of the mobile terminal, is consistent to the working voltage needed by the opened functional chip. According to the method disclosed by the invention, various voltage values can be output by the power supply management chip so that the requirements of power supply voltage of all the chips can be met and a great selection scope is provided for selecting all the functional chips for the mobile terminal; the working of the chips with high power supply voltage precision requirements is more stable.

Description

technical field [0001] The present invention relates to the field of mobile terminals, in particular to a method and system for controlling the output voltage of a mobile terminal and a power management chip thereof. Background technique [0002] With the rapid development of mobile devices and the continuous improvement of people's living standards, the use of various mobile terminals such as mobile phones has become more and more popular, and mobile phones have become an indispensable communication tool in people's lives. [0003] Each chip in the mobile terminal needs to be powered by the power management chip, and the stability of the voltage output by the power management chip will directly affect whether each chip in the mobile terminal can work normally. Such as figure 1 As shown, the power management chip is connected to multiple chips (chip 1, chip 2, chip 3, chip 4, chip 5, and chip 6) to provide the power supply voltage required by each chip for each chip. On the...

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Problems solved by technology

[0004] In the prior art, although each output voltage of the power management chip can be set independently, it is generally only set by an 8-bit register at most. After all, the range of setting voltage is limited, and there can only be 2 8 = 256 kinds of voltages can be set; therefore, the power management chip is set to set the voltage in steps, for example, set it in steps of 20mV, that is, only 20mV, 40mV, 60mV, ...; Therefore, when selecting a mobile terminal When using the various chips used on the computer, if the power management chip cannot output the supply voltage of the chip, you can only choose a chip with the same function to replace it; or choose a voltage whose input voltage is close to the power supply voltage required by the function chip, but it will make the There is a risk of unstable work in functional chips

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