PP_BATT_VCC : This is the main battery voltage rail that originates directly from the battery connector. It carries the raw battery voltage (typically 3.8V–4.2V, depending on charge level) into the mainboard. It’s the starting point of power distribution and feeds into various subsystems, including the charging and power management circuits. PP_VCC_MAIN : After PP_BATT_VCC, the voltage often passes through protective components (like fuses or MOSFETs) and becomes PP_VCC_MAIN. This rail powers the primary circuits on the board, including the Power Management IC (PMIC) and, indirectly, the charging IC. On the iPhone 12 Pro, this rail is a key intermediary between the battery and downstream power regulation. PP_BUS (or similar intermediate rail)**: Some iPhone designs use an intermediate bus voltage rail (sometimes labeled PP_BUS or a variant) that connects PP_BATT_VCC to the charging IC and other components. This rail might be filtered or regulated slightly before reach...
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🔋 1. Power Source & Initial Activation This stage involves powering the device and initializing voltage regulators . Step 1: Battery or Charger Supplies Power The iPhone receives power from either: The battery (connected via VBAT) The Lightning port (if charging or connected to a computer) VBAT Line (Main Battery Line) VBAT is the main power rail connected directly to the battery. It supplies raw battery voltage (3.7V - 4.35V) to the Power Management IC (PMIC) . If VBAT is missing or disrupted, the phone will not power on . ⚡ 2. Power Management & Voltage Regulation Step 2: Power Management IC (PMIC) Activation The PMIC (Power Management Integrated Circuit) is responsible for regulating voltage and distributing power to various components. The PMIC is controlled by the AP_TO_PM_ENABLE signal , which is triggered when the power button is pressed. Step 3: PMIC Generates Power Rails The PMIC takes the raw VBAT voltage and converts it into different power rails: Power...
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