MT6358VW IC

Product Details
Product Details:

- Part Number: MT6358VW (Top Marking: MT6358VW / MT6358W)

- Related / Successor Variants: MT6358W, MT6366W

- Manufacturer: MediaTek Inc. (MTK)

- Function: Primary System Power Management Integrated Circuit (Main PMIC)

- Regulators Architecture:

* Synchronous Step-Down DC/DC Buck Converters for high-efficiency core rails (VCORE, VPROC, VGPU, VDRAM, and VMODEM)

* Array of Low-Noise LDO Regulators for Camera Modules, Display Power, Flash Memory (eMMC/UFS), Audio Codec, and Sensors

- System Coordination:

* Master Power-On, Reset & Sleep Sequence Controller (PWRKEY, SRCLKENA, PMIC_RESET_B)

* Real-Time Clock (RTC) 32.768 kHz crystal oscillator and alarm logic

* Battery Fuel Gauge & Real-Time Battery Current/Voltage Sensing

* SPI / SPMI Control Bus for direct high-speed processor communication

- Package Type: Fine-Pitch BGA / WLCSP

- Mounting Type: Surface Mount Technology (SMD BGA Soldering / Reballing)

Usage:

- Central Motherboard Power Delivery: Acts as the primary energy management hub, regulating system power across MediaTek Helio G-Series (G70, G80, G85, G88) and Helio P-Series (P65, P35, G35) platforms.

- Target Devices & Compatible Models:

* Xiaomi / Redmi / POCO: Redmi 9, Redmi 9 Prime, Redmi Note 9, Redmi 10X 4G, Redmi 10, Redmi 12C, Redmi 13C, POCO M2

* Oppo: Oppo A9, Oppo A91, Oppo A79, Oppo A3, Oppo A31, Oppo A12, Oppo A15, Oppo A54

* Realme: Realme C3, Realme C11, Realme C12, Realme C15, Realme C25, Realme 6i, Realme Narzo 10A, Narzo 20

* Vivo: Vivo Y19, Vivo Y5s, Vivo Y20G, Vivo Y30, Vivo Y12s, Vivo Y15s

* Samsung: Galaxy A31 (SM-A315F), Galaxy A41 (Helio P65 variants)

* Infinix / Tecno: Infinix Hot 10, Hot 11, Note 7, Note 8, Tecno Spark 7 Pro, Pova series

- Common Fault Symptoms & Motherboard Diagnostics:

* Dead Phone (No Power / Low Boot Pulse): Mobile phone shows no response; on a DC bench power supply, pressing the power button draws a low pulse (0.04A–0.12A) and drops back to zero or remains statically frozen due to missing VCORE, missing VIO18 (1.8V), or an interrupted boot sequence.

* Direct VPH_PWR / VBAT Short Circuit: Blown internal switching FETs cause an instant short circuit to ground, tripping or beeping the bench power supply upon connecting battery leads.

* Boot Loop / Hang on Logo: Voltage instability or droop under processing load on the VCORE or VDRAM buck lines causes the phone to restart continuously at the vendor boot logo.

* Drop Damage / Solder Joint Fracture: Highly common in drop-damaged Redmi 9 and Note 9 devices where mechanical impact cracks the BGA solder balls under MT6358VW, requiring chip reballing or replacement.

* High Standby Current / Excessive Battery Drain: Handset becomes warm near the PMIC shielding in standby mode, rapidly draining the battery even when the screen is off due to internal LDO leakage.