PMI 8937 Original Mobile Phone IC
Effortlessly Enhance Your Device’s Functionality
The PMI 8937 Original Mobile Phone IC is a high-quality integrated circuit designed to ensure optimal performance for your smartphone. Manufactured with precision, this IC perfectly complements the durability and reliability of your mobile device. PMI 8937 Original Mobile Phone IC
Why Choose the PMI 8937?
As an original replacement part, the PMI 8937 delivers unmatched compatibility with a range of mobile models. Whether you are repairing or upgrading your device, this IC guarantees smooth performance and stable functionality. PMI 8937 Original Mobile Phone IC
Engineered for Efficiency
With advanced processing capabilities, the PMI 8937 not only enhances your phone’s efficiency but also extends its lifespan. It is the perfect choice for those who prioritize quality and functionality in their devices.
The PMI8937 is a critical secondary Power Management Integrated Circuit (PMIC) developed by Qualcomm, specifically designed to complement the Snapdragon 430/435 series chipsets.1 It is a “companion” chip to the main PM8937 IC, primarily handling high-current tasks like battery charging, display power, and USB interface management. PMI 8937 Original Mobile Phone IC
Below are the detailed technical specifications and functional breakdown of the PMI8937. PMI 8937 Original Mobile Phone IC
Core Specifications Table
| Feature | Specification Details |
| Manufacturer | Qualcomm Technologies, Inc. |
| Part Number | PMI-8937-0-183FOWNSP |
| Package Type | 183-pin FOWNSP (Fan-Out Wafer-Level Chip Scale Package) |
| Compatible Chipsets | Snapdragon 430 (MSM8937), Snapdragon 435 (MSM8940) |
| Primary Function | Power Management Interface (Secondary PMIC) |
| Key Subsystems | Battery Charger, Flash LED Driver, Display Bias, RGB LED |
| Communication Bus | SPMI (System Power Management Interface) |
| Operating Temp | -30°C to +125°C (Standard Industrial Grade) |
Functional Breakdown
The PMI8937 is not just a voltage regulator; it serves as the “heavy lifter” for the device’s external interfaces.
1. Battery Charging Management2
The PMI8937 integrates a high-efficiency switching charger. PMI 8937 Original Mobile Phone IC
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Charging Current: Supports up to 2.0A – 3.0A (depending on thermal constraints).
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Protection: Includes Over-Voltage Protection (OVP), Thermal Regulation, and Battery Temperature Monitoring (Thermistor interface).
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USB Interface: Handles USB 2.0 PHY tasks and manages the power path (Power Path Management) allowing the phone to boot even with a dead battery when plugged in.
2. Display and Backlight Control
One of the most common reasons for replacing this IC in repair shops is “No Light” or “No Display” issues.
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LCD Bias: Generates the positive ($+5V$) and negative ($-5V$) rails required for LCD panels.
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WLED Driver: Integrated boost converter to drive the high-voltage backlight LED string (up to 25V-30V).
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Flash LED: Controls the high-current Flash LED for the rear camera.
3. Voltage Regulation (LDOs and Bucks)3
While the main PM8937 handles the CPU/GPU, the PMI8937 provides auxiliary rails:
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LDOs: Low-dropout regulators for noise-sensitive components like the camera sensors and touch controllers.
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VPH_PWR: It serves as the bridge for the main system power rail ($V_{PH\_PWR}$), distributing battery or USB power to the rest of the board.
Common Applications and Devices
This IC is famously used in “budget flagship” and mid-range devices from 2017–2020. Notable devices include:
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Xiaomi: Redmi 3S/3S Prime, Redmi 4/4X, Redmi Note 4 (Global/Snapdragon version).
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Motorola: Moto G5, Moto E4 Plus.
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Lenovo: K6 Power, K6 Note.
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Samsung: Certain variants of the J-series (J3 Pro).4
Repair & Diagnostic Tips
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Symptom – No Charging: If the phone shows no current draw on a USB meter, the PMI8937 is often the culprit as it houses the charging MOSFETs.
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Symptom – Half-Light/No Backlight: If the screen has an image (visible under a flashlight) but no backlight, check the output of the PMI8937 backlight boost pin.
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Reballing: This chip uses a BGA (Ball Grid Array) pattern.5 Due to its proximity to the charging port, it is susceptible to thermal stress and may require reballing or replacement.
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