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Power Rails from Battery Connector to Charging IC

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📱 iPhone Startup Process: Electrical Perspective

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📴 iPhone Power Distribution When Turned Off

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  🔋 1. Battery (VBAT) Supplies Standby Power The VBAT (Main Battery Line) is always connected to the logic board, even when the iPhone is off. VBAT voltage: ~3.7V-4.2V , depending on battery charge. ⚠️ If VBAT is missing or disconnected, the iPhone will not turn on, even when plugged into a charger. ⚡ 2. Power Management IC (PMIC) is Always Active PMIC (Power Management Integrated Circuit) remains partially active to manage charging, power button detection, and wake-up events. PMIC generates low-power standby voltages to supply essential circuits. These voltages keep the iPhone "ready to turn on" when needed. ⚠️ If PMIC fails, the iPhone will be completely dead (no charging, no response). 📶 3. Always-On Power Rails (Even When Off) Some power rails remain active even when the phone is off, including: Power Rail Voltage Purpose PP_VDD_MAIN 3.7V-4.2V Main power for essential circuits PP3V0_TRTC 3.0V Real-Time Clock (RTC) for system time PP1V8_ALWAYS 1.8V Always-on low-powe...
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