MT6315FP Secondary Power Management IC (Buck)

Technical Specifications: Replacement Power Management Unit (Sub-PMIC).

• Model Number: MT6315FP.

• Manufacturer: MediaTek.

• Type: Buck Converter / Secondary PMIC.

• Function: Provides dedicated voltage regulation for specific CPU/GPU clusters to handle high current demands in 5G chipsets (Dimensity 700/800 series).

Common Fixes:

1. Restart on Load: Phone restarts when opening games or heavy apps due to voltage drop.

2. Dead Boot: Complete power loss if the IC is shorted.

3. Short Circuit: Overheating in the secondary power area causing battery drain.

Compatibility: Found in devices running MediaTek Dimensity 700 / 800 / 900, such as:

• Xiaomi / Poco: Redmi Note 10 5G, Poco M3 Pro 5G, Redmi Note 11S 5G.

• Realme: Realme 8 5G, Realme Narzo 30 5G.

• Samsung: Galaxy A22 5G (A226).

• Oppo: A53s 5G, A74 5G.

Technician Note: Please verify the suffix “FP”. There are other versions like “MP” or “TP” which may have different voltage outputs or pin configurations.