PMI 8940 Original Mobile Phone IC
Reliable PMI 8940 Original Mobile Phone IC
Upgrade your mobile device’s performance with the PMI 8940 Original Mobile Phone IC, designed to ensure optimal functionality and durability. This high-quality component is an essential upgrade for maintaining your phone’s peak performance and reliability.
Why Choose the PMI 8940 IC?
Crafted with precision, the PMI 8940 IC is engineered to meet the highest industry standards. Whether you’re replacing a faulty component or building a custom device, this IC guarantees smooth and efficient operation, making it an invaluable addition to your toolkit.
Perfect Compatibility and Easy Integration
Featuring seamless compatibility with various mobile phone models, the PMI 8940 is both robust and easy to integrate. Its original design ensures a secure fit and steady performance, reassuring you of its unmatched dependability.
The PMI8940 is a highly integrated Power Management Integrated Circuit (PMIC) developed by Qualcomm. It is a vital secondary power chip found in many mid-range smartphones, particularly those utilizing the Snapdragon 435 and 450 platforms.
The PMI8940 is responsible for specialized power tasks that the main PMIC (like the PM8937 or PM8940’s companion) doesn’t handle alone—most notably battery charging, LCD backlighting, and Flash LED control. PMI 8940 Original Mobile Phone IC
Technical Specifications: PMI8940
| Category | Specification Details |
| Manufacturer | Qualcomm |
| Part Number | PMI8940 / PMI8940-000 |
| Type | Power Management IC (PMIC) |
| Package Type | BGA (Ball Grid Array) |
| Pin Count | 112 Pins (approx.) |
| Operating Voltage | 3.6V to 4.4V (Standard Lithium Battery Range) |
| Supported Platforms | Snapdragon 430, 435, 450, 625 Series |
| Core Functions | Battery Charging, Backlight Driver, Flash Driver, LDOs |
| Charging Support | Quick Charge 2.0 / 3.0 Compatible (Model dependent) |
| RoHS Status | Lead-Free / RoHS Compliant |
Key Features & Internal Modules
The PMI8940 is more than just a voltage regulator; it contains several sub-blocks that manage critical user-facing features:
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Switching Battery Charger: It manages the current flow from the USB port to the battery. It includes thermal sensing to prevent the phone from overheating during fast charging. PMI 8940 Original Mobile Phone IC
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WLED Driver: This module generates the high voltage (typically $15\text{V}$ to $25\text{V}$) required to power the backlight of the mobile display. PMI 8940 Original Mobile Phone IC
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Flash LED Driver: Controls the high-current burst required for the camera flash and the steady current for the “torch” mode. PMI 8940 Original Mobile Phone IC
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RGB LED Controller: Manages the notification LED (Red, Green, Blue) often found on the front of older smartphone models. PMI 8940 Original Mobile Phone IC
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Voltage Rails (LDOs/Bucks): Provides specific, stable voltage lines for the CPU, GPU, and RAM. PMI 8940 Original Mobile Phone IC
Pinout Functionality (Simplified)
While a full 112-pin map is highly technical, the PMI8940’s pins are grouped into functional blocks:
| Pin Group | Function Description |
| VIN / VBUS | Input from the USB charging port ($5\text{V}$). |
| VBAT | Connection to the positive terminal of the battery. |
| SW (Switch) | Inductor connection for the internal Buck converters. |
| VOUT (Regulated) | Stabilized outputs for peripheral components. |
| EN (Enable) | Signal pins that tell the IC when to wake up or sleep. |
| FB (Feedback) | Monitoring pins that ensure voltage stays at the target level. |
| GND | Ground reference and thermal dissipation path. |
Common Compatible Models
The PMI8940 is a “workhorse” IC used extensively in the following devices:
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Xiaomi: Redmi 4X, Redmi Note 4 (Global), Redmi 5, Redmi S2/Y2, Mi A1.
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Oppo: A57.
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LG: K10 (2017), Stylus 3.
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Huawei/Honor: Various Honor 7A/8A variants.
Diagnosis & Repair Note
In mobile repair, the PMI8940 is often the first suspect when a phone has “No Backlight” (even if the image is visible under a flashlight), “Fake Charging” (shows charging icon but battery percentage doesn’t rise), or a “Dead/No Power” state following a short circuit in the charging port.
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