PM 8940 Mobile Phone IC
Efficient Power Management for Your Mobile Device
The PM 8940 Mobile Phone IC is a cutting-edge solution designed to ensure optimal power management for your mobile devices. Engineered for performance and reliability, this IC enhances device functionality while minimizing energy consumption. PM 8940 Mobile Phone IC
Advanced Features for Seamless Integration
With its robust design and advanced features, the PM 8940 IC integrates seamlessly into modern mobile devices. It supports efficient voltage regulation, thermal management, and ensures consistent performance—even under intensive usage scenarios.
Built for Durability and Compatibility
The PM 8940 Mobile Phone IC is crafted with precision to be compatible with a wide range of mobile platforms. Its durable construction and dependable performance make it an ideal choice for developers and manufacturers looking to optimize their devices.
The PM8940 (often paired with the PMI8940) is a highly integrated Power Management Integrated Circuit (PMIC) designed by Qualcomm. It primarily serves the Snapdragon 400 and 600 series chipsets, though it is famously used in specific high-profile devices like the Samsung Galaxy S8 (Global variants) and various Xiaomi models.
Its primary role is to act as the “heart” of the phone’s power distribution, converting raw battery voltage into multiple precise levels required by the CPU, GPU, RAM, and camera.
PM8940 Technical Specifications
The following table details the electrical and physical characteristics of the PM8940 IC based on industry datasheets and repair standards.
| Feature | Specification Details |
| Manufacturer | Qualcomm Technologies, Inc. |
| Model Number | PM8940 (Secondary: PMI8940-0VV / 000) |
| Package Type | BGA (Ball Grid Array) |
| Pin Count | 112-Pin / 144-Pin (depending on revision) |
| Input Voltage (VIN) | 3.0V – 4.4V DC (Battery Range) |
| Output Rails | Up to 14 DC/DC Buck Converters & LDOs |
| Switching Frequency | 2.0 MHz ±5% |
| VCORE Output | Variable (0.6V to 1.2V based on CPU load) |
| Max Output Current | Up to 6A on CPU/GPU core rails |
| Thermal Shutdown | 135°C (Auto-protection threshold) |
| Communication | I²C / SPMI Interface for OS-level control |
| Compatible Platforms | Snapdragon 430, 435, 820/821 (specific designs) |
Key Functions & Features
1. Multi-Rail Voltage Regulation
The PM8940 manages several independent power domains. It ensures that the VDD_CPU (Processor core) receives high-current, low-voltage power, while the VDD_MEM (Memory/RAM) receives a steady, low-noise supply to prevent data corruption.
2. Battery & Charging Management
Integrated within the PM8940/PMI8940 series is the logic for:
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Fuel Gauging: Calculating accurate battery percentages.
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Fast Charging: Managing thermal limits during high-wattage charging cycles.
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Protection: Guarding against overvoltage (OVP) and overcurrent (OCP) to prevent battery swelling or logic board fires.
3. Power Sequencing
During the boot process, different components must turn on in a specific order (e.g., RAM must be powered before the CPU core). The PM8940 handles this micro-timing. A failure in this IC often leads to a “dead” phone or a device stuck in a boot loop.
Device Compatibility List
This IC is a staple in many mid-range and former flagship smartphones. If you are a technician, the PM8940 is often interchangeable across these common models:
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Xiaomi: Mi A1, Mi 5X, Redmi 4X, Redmi Note 5A, Redmi S2, Redmi Y1.
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Samsung: Galaxy S8 (SM-G950F/U), S8 Plus (SM-G955F).
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Huawei: Y7 Prime (2017/2018).
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OPPO: A57 (CPH1701).
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LG: Q6, MP260.
Common Failure Symptoms
When the PM8940 fails, the device typically exhibits the following issues:
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No Power-On: The device shows 0.00A or a very low, static current draw (~0.01A–0.05A) on a DC Power Supply. PM 8940 Mobile Phone IC
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Charging Issues: The phone stays at 0% or does not recognize the charger. PM 8940 Mobile Phone IC
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Overheating: The IC becomes hot to the touch immediately after connecting the battery. PM 8940 Mobile Phone IC
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Short Circuit: A “VPH_PWR” short where the main power line is grounded, preventing any operation. PM 8940 Mobile Phone IC
Technician Note: When replacing this IC, it is critical to use the correct revision (e.g., 0VV vs 000). While they look identical, mismatched revisions can lead to “Half-Short” conditions or the inability to boot the Android OS while still allowing the charging logo to appear. PM 8940 Mobile Phone IC
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