MI Y1 Charging IC Original Mobile Phone IC
Premium Quality MI Y1 Charging IC
Ensure your MI Y1 Charging IC Original Mobile Phone IC smartphone functions flawlessly with the Original Mobile Phone Charging IC designed specifically for seamless compatibility. Crafted with precision, this IC not only restores optimal charging efficiency but also safeguards your device from potential power fluctuations. MI Y1 Charging IC Original Mobile Phone IC
Reliable Performance and Durability
Built to meet original specifications, this MI Y1 Charging IC guarantees reliable performance and long-lasting durability. Whether you’re addressing charging issues or upgrading components, this IC is the perfect solution for maintaining your phone’s functionality at its peak. MI Y1 Charging IC Original Mobile Phone IC
A Perfect Fit for Your MI Y1
Enjoy a hassle-free replacement process thanks to its perfect fit and easy installation. Designed with user convenience in mind, this IC is tailored to match the exact needs of your MI Y1 device, offering superior compatibility and dependable performance with every use. MI Y1 Charging IC Original Mobile Phone IC
The Xiaomi Redmi Y1 (also known as the Redmi Note 5A in some regions) relies on a sophisticated power management architecture to handle its 3080mAh battery. The primary component responsible for charging and secondary power management in this device is the PMI8940 (or in some hardware revisions, the PMI8952). MI Y1 Charging IC Original Mobile Phone IC
Below is the technical breakdown and exhaustive specifications for the original charging IC found in the Mi Y1. MI Y1 Charging IC Original Mobile Phone IC
Technical Specifications: PMI8940 / PMI8952
The charging IC in the Mi Y1 is not just a simple gatekeeper for electricity; it is a Power Management Integrated Circuit (PMIC) that handles the Switch-Mode Battery Charger (SMBC), the Fuel Gauge (for battery percentage accuracy), and the WLED (Backlight) driver. MI Y1 Charging IC Original Mobile Phone IC
| Feature | Specification Details |
| IC Model Number | PMI8940 (Primary) / PMI8952 (Variant) |
| Manufacturer | Qualcomm Technologies, Inc. |
| Package Type | 144-pin WLNSP (Wafer Level Nano Scale Package) |
| Charging Technology | Switch-Mode Battery Charger (SMBC) |
| Input Voltage (VBUS) | 3.9V to 13.5V (Supports High Voltage Input) |
| Fast Charge Current | Up to 2.1A – 3.0A (Software & Thermal limited) |
| USB Support | USB 2.0 / Micro-USB Interface |
| Quick Charge Support | Qualcomm Quick Charge 2.0 / 3.0 Compatible |
| Efficiency | > 90% (during typical 1A/2A charging) |
| Battery Voltage Range | 2.5V (Deep Discharge) to 4.4V (Termination) |
| Integrated Components | Fuel Gauge, OTG Boost, Flash LED Driver, WLED Driver |
| Thermal Protection | Integrated Over-temperature Shutdown |
Comprehensive Functional Breakdown
To understand how the Mi Y1 manages power, it is essential to look at the three core pillars of this specific IC’s functionality.
1. Advanced Charging Management
The PMI8940 utilizes a Switch-Mode architecture. Unlike older linear chargers that dissipate excess voltage as heat, a switch-mode charger converts higher input voltages into the lower battery voltage with minimal energy loss. MI Y1 Charging IC Original Mobile Phone IC
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Trickle Charge: Safely revives a completely dead battery at a very low current. MI Y1 Charging IC Original Mobile Phone IC
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Constant Current (CC): The “Fast Charge” phase where the bulk of the energy is delivered. MI Y1 Charging IC Original Mobile Phone IC
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Constant Voltage (CV): The final phase where current tapers off to prevent overstressing the battery cells. MI Y1 Charging IC Original Mobile Phone IC
2. Integrated Fuel Gauge
One common issue with third-party or “local” ICs is the “jumping battery percentage.” The original Qualcomm PMI8940 includes an integrated Coulomb Counter. It measures the exact amount of energy flowing in and out of the battery. This ensures that the 15% warning is actually 15%, preventing sudden shutdowns. MI Y1 Charging IC Original Mobile Phone IC
3. Display and Flash Driver
Uniquely, the charging IC in the Mi Y1 also controls the WLED (White LED) for the screen’s backlight. If your Mi Y1 has a “black screen” but still vibrates or makes sounds, the culprit is often a blown backlight driver circuit inside this specific charging IC. It also regulates the current for the rear camera flash. MI Y1 Charging IC Original Mobile Phone IC
Identifying the Original IC
When sourcing a replacement, look for the following markings on the chip surface to ensure it is the original component:
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Qualcomm Logo: A small, etched Qualcomm logo.
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Part Number: “PMI8940” or “PMI8952” followed by a batch code (e.g., 000-01).
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Physical Integrity: The original IC uses a BGA (Ball Grid Array) layout with high-lead-count solder balls.
Note on Compatibility: The PMI8940 is also found in devices like the Redmi 4X and Redmi 5. While the IC is the same, the surrounding resistors and capacitors on the motherboard (the “peripheral circuit”) determine the final charging speed and safety thresholds.
Common Failures and Diagnostics
If you are looking for this IC because of a charging issue, verify these symptoms:
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Fake Charging: The phone shows the charging icon, but the percentage never increases (indicates a failure in the CC phase).
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Short Circuit: The phone is completely dead and the IC gets hot immediately when the battery is connected (internal VPH_PWR short).
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No Backlight: The phone turns on but the screen is invisible (WLED driver failure).
Comparison Table: Original vs. Replacement ICs
| Feature | Original Qualcomm IC | High-Quality Refurbished | Cheap “Copy” IC |
| Heat Dissipation | Low (High Efficiency) | Moderate | Very High (Overheats) |
| Charging Speed | Consistent 2A | Variable | Slow (< 1A) |
| Battery Health | Preserved (Accurate Cutoff) | Good | Risk of Overcharging |
| Backlight Stability | Flicker-free | Stable | Potential Flickering |
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