MAX77854 PMIC for Samsung Galaxy S7 (G9300) & S7 Edge (G9350) – Power Management IC Replacement and Repair

1. Introduction to MAX77854 PMIC.

The MAX77854 PMIC (Power Management Integrated Circuit) is a versatile component used in various devices, including smartphones like the Samsung Galaxy S7 (G9300) and S7 Edge (G9350). For these models, the MAX77854 plays a crucial role in managing power distribution and battery management to ensure optimal performance and efficiency.

MAX77854 in Samsung Galaxy S7 and S7 Edge

2. Purpose and Functionality

• Power Management: The MAX77854 integrates multiple power management functions, including buck converters and LDO regulators, to efficiently manage the power requirements of the Samsung Galaxy S7 and S7 Edge.
• Battery Charging: Manages charging processes and power delivery to ensure safe and efficient charging of the device’s battery.
• Voltage Regulation: Provides stable and accurate voltage levels to various components of the device, such as the CPU, GPU, and memory.
• Protection Features: Includes safety mechanisms to protect against overcurrent, overheating, and other potential issues.

3. Key Features of MAX77854

• High Efficiency: Ensures that the power conversion is highly efficient, which helps extend battery life and reduce heat generation.
• Multiple Output Rails: Supports various voltage rails required by different parts of the device.
• Integrated Buck Converters: Buck converters step down higher input voltages to lower, regulated output voltages.
• LDO Regulators: Provides additional regulated voltage outputs with minimal dropout voltage.
• Thermal and Overcurrent Protection: Protects the device from damage due to excessive current or heat.

4. Application in Samsung Galaxy S7/S7 Edge

• Samsung Galaxy S7 (G9300): The MAX77854 PMIC ensures that the power needs of the Galaxy S7 are met efficiently, managing multiple voltage rails and optimizing battery performance.
• Samsung Galaxy S7 Edge (G9350): Similar to the Galaxy S7, the MAX77854 manages power distribution for the S7 Edge, which includes handling its larger display and additional features.

5. How to Replace or Repair MAX77854 PMIC

Replacing or Repairing the MAX77854 in Samsung Devices

If you need to replace or repair the MAX77854 PMIC in the Galaxy S7 or S7 Edge, follow these steps:

1. Preparation

• Power Off: Ensure the device is turned off and disconnected from any power source.
• Disassemble: Carefully open the device following manufacturer guidelines or a repair manual.

2. Locate the PMIC

• Find the MAX77854: Refer to the device’s schematic or repair guide to locate the MAX77854 PMIC on the motherboard.

3. Desolder the Old PMIC

• Heat the Soldering Iron: Set it to the appropriate temperature (typically around 350°C or 662°F).
• Desolder Pins: Use a desoldering pump or wick to remove the solder from the PMIC pins.
• Remove the PMIC: Gently lift the PMIC from the board using tweezers once it is free of solder.

4. Prepare the PCB

• Clean the Area: Remove any residual solder and flux using isopropyl alcohol.
• Inspect for Damage: Check the PCB for any damage that may need repair.

5. Install the New PMIC

• Position the New MAX77854: Align the new PMIC with the PCB.
• Solder the Pins: Carefully solder each pin to the PCB, ensuring there are no short circuits or cold solder joints.

6. Test the Device

• Inspect Solder Joints: Check for any issues with the soldering.
• Reassemble and Power On: Reassemble the device and test its power management functions.

7. Final Assembly

• Reassemble the Device: Carefully put the device back together.
• Test the Device Thoroughly: Ensure that all functions are working correctly.

6. Technical Specifications and Datasheet

Finding the Datasheet

To access the datasheet for the MAX77854, visit:

·         Analog Devices: The datasheet is available on the Analog Devices website.

• MAX77854 Datasheet on Analog Devices

·         Electronic Component Distributors: Check sites like Digi-Key or Mouser for the datasheet and component details.

• Digi-Key MAX77854 Datasheet
• Mouser Electronics MAX77854 Datasheet

7. Where to Buy MAX77854 PMIC

• Authorized Distributors@BilalGsm
• Online Retailers and Component Suppliers

8. Conclusion

• Summary of MAX77854 Features and Benefits
• Final Thoughts on Maintenance and Replacement