MAX 77865 S Mobile Phone IC
Maximize Your Device’s Potential
The MAX 77865 S Mobile Phone IC is designed to deliver exceptional power management for modern mobile devices. Whether you’re enhancing smartphone performance or developing power-efficient projects, this IC offers unparalleled reliability and efficiency. MAX 77865 S Mobile Phone IC
Top-Tier Features for Seamless Integration
This advanced integrated circuit includes cutting-edge power delivery solutions that ensure stable and consistent performance. With its compact design, it’s the perfect choice for manufacturers and engineers aiming to optimize space without sacrificing capability. MAX 77865 S Mobile Phone IC
Simplify Development with Versatility
Engineered for adaptability, the MAX 77865 S supports various mobile device requirements. Its robust performance, energy-saving features, and compatibility with modern circuitry make it a dependable choice for the competitive tech landscape.
The MAX77865S is a specialized Power Management Integrated Circuit (PMIC) and Charging IC manufactured by Maxim Integrated (now part of Analog Devices). It is commonly referred to in the mobile repair industry as the “Small PMIC” or “Small Power IC,” primarily serving high-end flagship devices like the Samsung Galaxy S8, S8+, and Note 8.
Unlike the main PMIC, which handles the entire system’s power rail, the MAX77865S focuses on specific subsystems, including baseband power, intermediate frequency (IF) processing, and fast-charging management.
MAX77865S Technical Specifications
| Feature | Specification Details |
| Manufacturer | Maxim Integrated (Analog Devices) |
| Model Number | MAX77865S (often marked as MAX77865SEWZ) |
| IC Type | Power Management / Baseband Power / Charging IC |
| Package Type | WLP (Wafer Level Package) / BGA (Ball Grid Array) |
| Core Functions | DC-DC Step-down (Buck), LDOs, Battery Charging |
| Input Voltage | Typically 3.7V to 4.4V (Lithium-ion Battery range) |
| Charging Support | Fast Charging (QC Support / Adaptive Fast Charging) |
| Interface | $I^2C$ (Inter-Integrated Circuit) for software control |
| Thermal Protection | Integrated thermal shutdown and JEITA monitoring |
| Operating Temp | -40°C to +85°C (Standard Industrial/Mobile range) |
Key Functional Areas
1. Power Distribution
The MAX77865S contains multiple Low Dropout Regulators (LDOs) and Buck Regulators. These are essential for converting the fluctuating voltage of a Li-ion battery into stable, low-noise voltage rails required by sensitive components like the RF (Radio Frequency) transceiver and the baseband processor. MAX 77865 S Mobile Phone IC
2. Charging Management
One of its most critical roles in the Galaxy S8 series is managing the Charging Path. It works in tandem with the USB-C controller to negotiate power delivery. It ensures that the current flowing into the battery is regulated to prevent overheating while maximizing speed. MAX 77865 S Mobile Phone IC
3. Baseband Support
In many schematics, this IC is labeled as the Small Baseband Power IC. It provides the specific voltages needed for the modem to maintain a cellular connection. If this IC fails, the phone may suffer from “No Service” issues or fail to detect the SIM card, even if the rest of the phone powers on normally. MAX 77865 S Mobile Phone IC
Common Symptoms of Failure
Because this IC is a “multi-tasker,” a failure can present in several ways:
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Charging Issues: The phone may show a charging icon but not increase in percentage (fake charging) or refuse to charge entirely. MAX 77865 S Mobile Phone IC
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Power Leaks: A short circuit within the MAX77865S often leads to “Dead Short” scenarios where the phone consumes high current ($>1A$) immediately when connected to a DC power supply. MAX 77865 S Mobile Phone IC
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Overheating: The chip may become physically hot to the touch during use or while charging.
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Signal Problems: Constant “Searching” or “No Service” errors despite a healthy antenna and SIM.
Compatibility Table
The MAX77865S is highly specific to certain hardware architectures. Below are the most common devices utilizing this chip:
| Brand | Model | Part Reference |
| Samsung | Galaxy S8 (G950F/U) | Small Power IC / IF PMIC |
| Samsung | Galaxy S8+ (G955F/U) | Small Power IC / IF PMIC |
| Samsung | Galaxy Note 8 (N950F/U) | Small Power IC / Charging IC |
| Meizu | Pro 6 / Pro 7 | Power Management |
| Huawei | P20 Pro (select regions) | Auxiliary PMIC |
Repair and Installation Notes
Replacing the MAX77865S requires professional-grade micro-soldering tools. Since it is a BGA (Ball Grid Array) chip, it is mounted using tiny solder balls underneath the package.
Technical Tip: When replacing this IC, technicians typically use a hot air station set between 330°C and 350°C with low airflow to avoid “bridging” the internal connections. It is highly recommended to use high-quality flux to ensure the solder balls seat correctly on the PCB pads.
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