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In this lesson, we'll talk about the functions of the power chips

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The step-down module integrated inside the power chip,

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also known as the BUCK switching power supply module,

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converts the input voltage step-down into a lower voltage

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Let's look at its circuit characteristics

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This is a power chip,

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input a power supply of about 4V to it

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After its internal module works,

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it completes the step-down of the circuit together with the external inductor

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For example, this output is 0.75V

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The power supply output current of the BUCK switching power supply is relatively large,

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and the voltage name with S on it represents SWITCH

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For example, in the left picture,

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the code name is VREG_S1A _S2A_S3A_0P75,

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which means that the power supply output by this switching power supply module is 0.75V

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We see that the power chip has a large inductor on the line that powers the output

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Its output voltage is 0.75V, the input voltage is 4V,

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the output is much smaller than the input, its process is step-down

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Another integrated circuit inside the power supply is called

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LDO low dropout linear regulator,

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also called LDO module

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The difference between its output voltage and input voltage is not large,

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and there is no large inductor on the output line,

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which is its appearance feature

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Let's take a look

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This is a power chip, VREG_S6A_0P9 is its input power supply,

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the voltage is 0.9V

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After its internal module works,

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it will output one or more voltages

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For example, in the picture, it outputs two channels,

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the first is VREG_L4A_0P75,

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and the second is VREG_L5A_0P88

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means it outputs a voltage of 0.75V and a voltage of 0.88V

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The output current of the LDO low dropout linear regulator is relatively small

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The voltage name has L or LDO,

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and Huawei's chip has VOUT,

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indicating that it is a low-current LDO-type power supply voltage

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For example, VREG_L4A_0P75 in the left picture

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is the power supply of an LDO step-down output

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VOUT8_1P8 is also this type of power supply

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Okay, that's it for this lesson