MAX 77843 Mobile Phone IC
High Performance Mobile Power Solution
The MAX 77843 Mobile Phone IC is a state-of-the-art power management integrated circuit (PMIC) designed to enhance the efficiency and longevity of your mobile devices. With its compact design and cutting-edge technology, it is an essential component for ensuring optimal power utilization without compromising performance. MAX 77843 Mobile Phone IC
Reliable and Compact Design
Engineered to support the latest mobile phone architectures, this IC is not only lightweight and compact but also highly reliable. The MAX 77843 is suitable for a wide range of applications, providing seamless integration with other components in your device’s system, while enabling consistent performance under demanding conditions. MAX 77843 Mobile Phone IC
Advanced Features for Modern Devices
The MAX 77843 boasts a host of advanced features, including precision voltage regulation, high thermal stability, and low power consumption. Whether you’re designing smartphones, tablets, or wearables, this IC is a versatile solution that meets and exceeds industry standards for power management. MAX 77843 Mobile Phone IC
The MAX77843 is a high-performance Power Management Integrated Circuit (PMIC) manufactured by Maxim Integrated (now part of Analog Devices). It is primarily used as a “Companion PMIC” in flagship smartphones and tablets, most notably appearing in the Samsung Galaxy S6, S6 Edge, and Note 4. MAX 77843 Mobile Phone IC
Designed to handle complex power distribution, battery charging, and interface switching, the MAX77843 integrates several critical functions into a single, compact wafer-level package (WLP).
Technical Specifications
The following table outlines the core electrical and mechanical specifications of the MAX77843.
| Feature | Specification / Detail |
| Manufacturer | Maxim Integrated (Analog Devices) |
| IC Type | Multi-function Companion PMIC |
| Package Type | 99-bump WLP (Wafer-Level Package) |
| Switch-Mode Charger | 3.0A Dual Input (Smart Power Path 3.0) |
| Charging Frequency | 4 MHz (High frequency for small L/C components) |
| Input Voltage Protection | Up to 16VDC withstand |
| Reverse Boost (OTG) | 5V at 1.25A (Inductor-less operation) |
| Fuel Gauge Tech | Proprietary ModelGauge (mg5) |
| LDO Regulators | Two Safeout LDOs (for USB interface) |
| LED Drivers | 4-Channel RGBW (25.5mA per channel) |
| MUIC Features | Micro-USB Interface Controller (USB 2.0/UART/Audio) |
| Haptic Driver | Integrated (for vibration motor control) |
| Control Interface | I2C Revision 3.0 Compatible |
| Thermal Protection | Die temperature regulation algorithm & shutdown |
Key Functional Blocks
The MAX77843 is more than just a voltage regulator; it serves as the “brain” for peripheral power and connectivity.
1. Smart Power Path Battery Charger
The IC features a high-efficiency 3.0A switch-mode charger. Because it operates at 4MHz, manufacturers can use much smaller external inductors and capacitors, saving precious board space. The Smart Power Path allows the device to boot up instantly when plugged in, even if the battery is completely discharged. MAX 77843 Mobile Phone IC
2. Reverse Boost (USB-OTG)
A standout feature is its ability to provide 5V power to external USB accessories (USB On-The-Go) without requiring an additional inductor. It can deliver up to 1.25A, which is sufficient for powering external flash drives, keyboards, or even charging another phone. MAX 77843 Mobile Phone IC
3. ModelGauge (mg5) Fuel Gauge
Maxim’s ModelGauge technology is highly regarded in the industry because it provides an accurate Battery State-of-Charge (SOC) without needing the “learning” cycles or calibration required by traditional coulomb counters. This ensures the percentage you see on your phone screen is accurate even as the battery ages. MAX 77843 Mobile Phone IC
4. MUIC (Micro-USB Interface Controller)
The integrated MUIC manages the physical Micro-USB port. It can detect what is plugged in (a standard charger, a high-voltage adapter, a UART cable for debugging, or even audio headphones) and route the signals internally to the correct processor pins. MAX 77843 Mobile Phone IC
Common Applications & Repair Context
In the mobile repair industry, the MAX77843 (often referred to by its board location U7000 in Samsung schematics) is a frequent target for troubleshooting.
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Charging Issues: If a phone fails to charge despite a good battery and port, this IC is often the culprit.
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Overheating: Short circuits within the internal LDOs or the charging block can cause the IC to heat up significantly.
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USB Connectivity: Issues with the phone not being recognized by a PC are often linked to the MUIC block within the MAX77843.
Note for Technicians: Replacing this IC requires advanced micro-soldering skills due to the 99-bump WLP structure. It is highly sensitive to heat and requires precise alignment during the reballing or replacement process.
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