Power Management of Samsung Galaxy A06 (SM-A065) with MT6358 PMIC

🔋 Power Management System of Samsung Galaxy A06 (SM-A065)

In this post, we’ll explore the power distribution system of the Samsung Galaxy A06 smartphone using the MT6358 PMIC and MT6769 SoC. Understanding how voltage rails are distributed helps technicians, engineers, and developers troubleshoot, repair, and optimize smartphone hardware.

📷 Circuit Diagram Overview

Samsung Galaxy A06 MT6358 Power Schematic

⚙️ Main Components

  • MT6358 - Power Management IC (PMIC)
  • MT6769 - Main Processor / SoC (Helio G70)
  • DRAM - Memory module
  • eMMC - Embedded storage
  • RT9471 - Charging IC

🔌 Power Input

The main power comes from the battery, denoted as VBAT = 3.7V. This voltage enters the system through the charging IC (RT9471) and is filtered via inductor L901 to provide VSYS = 3.7V to the MT6358 PMIC.

VBAT / VSYS: 3.7V → Main supply voltage to PMIC and other components.

🔧 Voltage Rails Generated by PMIC (MT6358)

1. For the SoC (MT6769)

  • VPROC Rails: 0.8V (core voltages for CPU & GPU)
  • VGPU: 0.8V → GPU Core
  • VSRAM_PROC1/2: 0.9V → SRAM internal logic
  • VMODEM: 0.8V → Baseband/Modem
  • VCORE: 0.8V → Logic Core
  • VSOC/VIO18: 1.8V → IO & peripherals
  • VUSB: 3.0V → USB functionality
SoC power lines ensure stable operation of the CPU, GPU, memory, modem, and I/O. Voltage levels vary depending on processing requirements and are managed dynamically by the PMIC.

2. For DRAM

  • VDD1: 1.8V
  • VDD2: 1.125V
  • VDDQ: 0.6V
DRAM requires precise voltage levels for core and I/O signaling. The PMIC provides multiple power domains tailored for different DRAM functions.

3. For eMMC Storage

  • VCC: 3.0V
  • VCCQ: 1.8V
eMMC storage uses two power domains: one for core operation and one for data I/O. These are supplied by the PMIC to enable reliable data access.

4. Other System Voltages

  • VX022: 2.2V
  • VREF: 1.2V
  • DVD18_DIG: 1.8V
  • VRTC: 2.8V (Real Time Clock)
  • VA12: 1.2V Analog
  • VS1: 2.0V
  • VS2: 1.35V
These voltages support peripheral devices, analog modules, timing circuits, and internal power references within the device.

🔁 How It All Works Together

Once the battery is connected and the system is powered on via the PWR_KEY, the MT6358 PMIC activates and begins distributing power to all essential blocks based on startup sequences defined in firmware.

The PMIC uses internal regulators (LDOs and buck converters) to step down the input voltage (3.7V) to precise levels required by each subsystem. These regulators are efficient and ensure minimal heat loss and maximum battery life.

📌 Highlights

  • PMIC ensures all voltage levels are stable and sequenced correctly.
  • SoC operates at multiple low voltages to balance performance and power efficiency.
  • Separate power domains for memory and storage improve reliability.
  • PMIC is the heart of power control in modern smartphones.

🧠 Conclusion

Power management is one of the most critical aspects of smartphone design. With components like the MT6358 PMIC and MT6769 SoC, devices like the Samsung Galaxy A06 achieve efficient and reliable operation across various hardware blocks. Whether you're a repair technician, reverse engineer, or enthusiast, understanding these power rails will help you diagnose issues, optimize performance, and appreciate the intricate design of mobile electronics.

Scroll to Top