PMI 8940 Mobile Phone IC
Optimize Your Mobile Device with PMI 8940
The PMI 8940 Mobile Phone IC is designed to enhance the efficiency and performance of your mobile devices. With its advanced architecture, this component ensures seamless functionality, offering a reliable solution for your smartphone’s core operations. PMI 8940 Mobile Phone IC
Cutting-Edge Technology for Smooth Performance
Engineered with precision, the PMI 8940 improves power management, stabilizes device performance, and optimizes battery life. It is the perfect choice for manufacturers and repair professionals seeking top-tier integrated circuitry for modern devices. PMI 8940 Mobile Phone IC
Compact, Durable, and Compatible
Despite its compact design, the PMI 8940 is built for durability. Fully compatible with a wide array of mobile devices, it is easy to integrate and offers long-term reliability under diverse operational conditions.
Choose the PMI 8940 Mobile Phone IC for unparalleled performance and dependable quality in your mobile devices. PMI 8940 Mobile Phone IC
The PMI8940 is a highly specialized Power Management Integrated Circuit (PMIC) developed by Qualcomm.1 Primarily found in mid-range smartphones using the Snapdragon 435 and 430 chipsets (and even supporting some Snapdragon 820/821 configurations), it acts as the secondary power hub for the device. PMI 8940 Mobile Phone IC
While the primary PMIC (like the PM8937) handles the main CPU and system rails, the PMI8940 focuses on battery charging, display power, and peripherals.
Key Technical Specifications
The following table outlines the core parameters and functional capabilities of the PMI8940 IC:
| Feature | Specification Details |
| Manufacturer | Qualcomm |
| Part Number | PMI8940-000 / PMI8940-0VV |
| Package Type | BGA (Ball Grid Array) |
| Pin Count | 112 Pins (varies by revision) |
| Application | Power Management / Charging / Display Backlight |
| Input Voltage Range | Typically 3.6V to 4.4V (Battery/USB Input) |
| Integrated Regulators | 8 Buck Converters, 3 Boost Regulators, Multi-channel LDOs |
| Charging Support | Qualcomm Quick Charge 2.0/3.0 Support |
| Compatibility | Xiaomi (Mi A1, Redmi 4X, Note 5A), Samsung (Galaxy S8 – international), Oppo (A57) |
| Specialized Blocks | WLED Driver (Backlight), RGB LED driver, Flash LED driver |
Core Functions & Architecture
The PMI8940 is more than just a voltage regulator; it is an intelligent subsystem that ensures the device remains stable under varying loads.2
1. Advanced Battery Management3
The IC manages the transition between USB power and battery power. It includes high-efficiency switching chargers that reduce heat generation during fast charging. It monitors battery temperature and voltage to prevent overcharging, a critical safety feature in modern lithium-ion systems.4
2. Display and Backlight Control
One of the distinguishing features of the “PMI” series (compared to the “PM” series) is its role in display power.
-
WLED Driver: It provides the high voltage required to power the LCD backlight.
-
LCD Bias: It generates the positive and negative voltages (often $+5V$ and $-5V$) required by the display panel to render images.
3. Voltage Regulation (Buck & LDO)5
The IC contains several Buck Converters (step-down) and LDOs (Low-Dropout Regulators).6
-
Buck Converters: Used for high-current applications like the RF power amplifier or system-on-chip (SoC) peripheral rails.
-
LDOs: Used for noise-sensitive components like camera sensors and audio circuits where stable, “clean” power is essential.
Common Failure Symptoms
In mobile repair, the PMI8940 is often a “target” component when a device exhibits specific faults.7 Because it sits between the charging port and the rest of the logic board, it is highly susceptible to damage from faulty chargers or liquid ingress.
-
No Charging: The device may detect a cable but show 0mA current draw.
-
Fake Charging: The lightning bolt icon appears, but the battery percentage never increases.
-
No Backlight: The phone boots (sounds/vibrations occur), but the screen remains dark.
-
Half-Short/Leakage: The device drains battery rapidly even when turned off, or the IC becomes hot immediately upon connecting a battery.
Repair & Replacement Note
Replacing the PMI8940 requires professional BGA reballing skills.8 Since the IC is located near the CPU or EMMC on many Xiaomi and Samsung boards, technicians must use high-quality flux and precise temperature control (typically around 330°C to 350°C depending on the station) to avoid collateral damage to surrounding chips.
More Products : https://gaffarmarketdelhi.com
