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Hello everyone, today we will learn the pin definition of the CPU power supply chip during the laptop startup process

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We take the power supply of VCCGT, VCCcore, VCCSA, etc.

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of Intel's 6th to 10th generation CPUs as an example to introduce their chip pins

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These power supplies are all controlled by the same chip, which is the main chip

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Here is an architecture diagram

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The model of this chip is ISL95829

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Then this is the CPU power supply main chip

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The small chip next to it is a DRMOS chip

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First of all, the above two DRMOS chips, here control the output power supply of the integrated display

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The two DRMOS chips in the middle control the generation of core power supply

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The bottom DRMOS chip controls the generation of VCCSA power supply

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These 5 DRMOS chips are all controlled by the same main chip

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Next, let's learn the pin definition of the main chip and DRMOS chip

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We take the ISL95829 chip as an example to introduce the chip pin definition

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We must first have a general understanding of this chip

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Just now we can see the three-way power supply controlled by the main chip in the diagram

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Therefore, these pin definitions are divided into Group A, Group B, and Group C

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The names of these pins end with A, which means they belong to group A,

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and they control the core power supply

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The ones ending with B are group B power supplies,

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which control the generation of integrated display power supplies

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Group C is used to control VCCSA, we can also call it VRC

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Group A can also be called VRA, group B can also be called VRB

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Let's first introduce the above pins

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Pin PROG5 is grounded through a resistor and is used to set the maximum current

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and operating frequency of the power supply of Group C

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It can also be said that this is the limit current setting and frequency setting of Group C

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Pin PROG4 is the frequency setting of Group A and Group B

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Pin PROG3 is the limit current setting of group B, set the current up to 50A,

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and set group B to 2-phase PWM

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Pin PROG2 is the limit current setting of group A power supply, here it is set to 70A current

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Pin PROG1 is the VBOOT voltage setting,

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the current VBOOT voltage is set to 0V

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VBOOT voltage is also called startup voltage

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Ok, this is the definition of these pins

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VIN is the main power supply of the chip, usually provided by the common point voltage

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VCC is also a power supply, usually provided by 5V standby voltage

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SCL, SDA refers to the SVID pin from the CPU

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VR_HOT# is the overheating indication signal output

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Group A and Group B of this chip have a pin connected to a thermistor, NTC,

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to detect the power supply temperature of Group A and Group B

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If the temperature of any power supply is too high,

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the main chip will output a low-level overheating indication signal to the CPU to notify the CPU to reduce frequency

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At this time, the performance of the system will be affected, and the fan speed will increase

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VR_READY is the signal output of the power supply,

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which means that the power supply chip is ready

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VR_ENABLE pin refers to the PWM enable pin, which is the enable pin of this chip

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This PSYS is the power monitoring of the system, generally not used,

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grounded through resistors and capacitors

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IMON is also the current monitoring output,

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which is also grounded through resistors and capacitors, which are not used pins

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COMP is the compensation pin,

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usually an external resistor and capacitor are connected in series to ground

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FB is the feedback pin, also called the voltage detection pin

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The FB and RTN pins are respectively connected to the CPU internal power supply pin and the ground pin,

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which are equivalent to two multimeter pens to directly measure

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whether the corresponding power supply inside the CPU is normal

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The FB and RTN pins of group B mainly detect whether the integrated display power supply of group B is normal

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This is used to detect the voltage, the voltage detection pin

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The pins start with IS are the current detection pins,

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which are connected to the front end and back end of the inductor of the integrated display power supply

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They are used to detect the energy in the inductors in real time,

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and adjust the current output of the two inductors to achieve the same output current of the two inductors

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FCCM and PWM1 are used to control the DMOS chip

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There is a DMOS chip next to it

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The FCCM and PWM are the pins from the main chip

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FCCM is the open of this DMOS chip, active at high level

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PWM is a pulse used to control its output current and output frequency

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GND is the grounding

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There is a PWM2 below, which is used to control another DRMOS chip

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FCCM is an open signal shared by multiple DMOS

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And PWM1 and PWM2 respectively control two DMOS chips

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The pins of group A are exactly the same as those of group B

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It also has a current monitoring output, a thermistor connection pin, compensation pin,

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feedback pin, voltage detection pin, current detection pin, etc.

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It also has FCCM pins and PWM pins,

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which are used to control the DMOS chip to generate core power supply output

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The pin definition of group C is also exactly the same as that of group B

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Let's take a look at this DMOS chip

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DMOS chip integrates MOS tube

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This VIN is the power supply of the internal upper tube D pole,

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and the S pole of the lower tube is grounded

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The middle phase pin is connected to the SW pin

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All SW pins are connected together, including this PHASE

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GND and PGND are the grounding

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VIN is the power supply for the D pole of the upper tube, usually from the common point voltage

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PVCC and VCC are generally provided by 5V power supply,

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which is the working voltage of the internal PWM module,

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and is used to control the work of the internal upper and lower tubes

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This PWM is also for the internal control module, including the open signal

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These NCs are idle pins

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BOOT is the boost pin, connected to the bootstrap capacitor

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A capacitor is connected between this phase pin and BOOT pin

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Ok, this is a brief introduction to the pin definition of the CPU power supply chip