MT6359P IC

Product Details
Product Details:

- Part Number: MT6359P (Marking: MT6359P / MT6359P/A)

- Sibling Variants: MT6359VKP, MT6359VNP, MT6359VPP

- Manufacturer: MediaTek Inc. (MTK)

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

- Regulators Architecture:

* Multi-Phase Synchronous Step-Down DC/DC Buck Converters (delivering high current to VCORE, VPROC, VGPU, VDRAM, and Modem)

* Extensive Array of Low-Dropout (LDO) Regulators for Camera Modules, Display, Audio, Flash Storage (UFS/eMMC), and Sensors

- System Integration:

* Master Power-Up & Reset Sequencing Logic (PMIC_RESET_B, RESET_IN)

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

* High-Precision Battery Fuel Gauge (coulomb counting & cell voltage tracking)

* Multi-Channel Telemetry ADC for real-time voltage, current, and thermal monitoring

- Built-in Protections: Over-Current Protection (OCP), Thermal Shutdown (150°C), Under-Voltage Lockout (UVLO), and Short-Circuit Safeguards

- Package Type: Fine-Pitch WLCSP / BGA

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

Usage:

- Centralized High-Performance Power Delivery: Distributes system power across the entire motherboard, stepping down battery/system bus voltage to low-voltage, ripple-free core rails for MediaTek MT6779 (Helio P90) and Dimensity processors.

- Target Devices & Compatible Models:

* Oppo: Oppo Reno 2, Oppo Reno Z, Oppo A94, Oppo F19 Pro (Helio P90 / MT6779 variants)

* Xiaomi / Redmi: Redmi Note 8 (MediaTek variants), Redmi 10X 5G, Redmi K30 Ultra

* Realme / Vivo: Realme Narzo series, Vivo S7t, Vivo V-series MTK variants

* Infinix / Tecno: Infinix Zero 8, Zero 8i, Tecno Phantom series

* Other mid-range to premium smartphones based on MT6779 and early Dimensity SoCs.

- Common Fault Symptoms & Motherboard Diagnostics:

* Dead Phone (No Power / Low Boot Pulse): Mobile shows no display or LED; on DC power supply, pressing the power button draws a small pulse (0.02A–0.08A) that drops to zero immediately due to missing CPU core voltages or incomplete boot sequencing.

* Repeated Flashing Failures / Boot Loop: Device halts during software flashing or boot loop because the PMIC cannot maintain stable output voltage during intense processor initialization.

* Direct VPH_PWR / VBAT Short: Blown internal high-side switching FET causes a dead short across the main power rails, tripping the bench power supply immediately upon connection.

* Missing Core & Memory Rails: Absence of VIO18 (1.8V IO rail), VDRAM, or CPU core supplies prevents memory handshake, leaving the board detected only in MTK USB / Preloader port.

* Rapid Battery Drain / Sleep Leakage: Phone discharges quickly in standby mode accompanied by localized heating over the MT6359P shield, typically caused by internal leakage in one of the auxiliary LDO lines.