BQ27520 / MI Y1 Charging Mobile Phone IC
High-Quality Charging Solution
Ensure the optimal performance of your MI Y1 smartphone with the BQ27520 / MI Y1 Charging Mobile Phone IC. Designed for seamless compatibility, this component guarantees efficient and reliable charging for your device, extending its battery life and boosting its overall productivity. BQ27520 / MI Y1 Charging Mobile Phone IC
Precision Engineering
The BQ27520 IC stands out with its robust design and precision engineering. It supports advanced power management features, providing consistent energy flow while protecting your device against overcharging and overheating. BQ27520 / MI Y1 Charging Mobile Phone IC
Essential for Repairs and Replacements
Whether you’re repairing your MI Y1 mobile phone or replacing a damaged component, the BQ27520 Charging Mobile Phone IC is an essential choice for maintaining peak device performance. Invest in quality and enjoy peace of mind with this reliable charging solution. BQ27520 / MI Y1 Charging Mobile Phone IC
The BQ27520 is a highly integrated, system-side Li-ion battery fuel gauge IC developed by Texas Instruments. In devices like the Xiaomi Redmi Y1 (often referred to as MI Y1), it serves a critical role as the “brain” behind battery monitoring, ensuring the system accurately knows how much charge is left and managing the health of the battery.
While often referred to as a “charging IC” in repair circles, it is technically a fuel gauge that works alongside the primary charging management IC to regulate power flow and report telemetry to the phone’s CPU.
1. Technical Overview: BQ27520-G4
The BQ27520 uses TI’s patented Impedance Track™ technology. Unlike traditional gauges that just measure voltage, this IC measures the battery’s internal impedance, which changes as the battery ages. This allows the Xiaomi Redmi Y1 to show an accurate percentage even after years of use. BQ27520 / MI Y1 Charging Mobile Phone IC
2. Full Specifications Table
The following table outlines the electrical, mechanical, and functional specifications of the BQ27520-G4 as used in modern smartphone architectures.
| Feature / Parameter | Specification Details |
| Manufacturer | Texas Instruments |
| Chemistry Supported | Li-Ion, Li-Polymer (Single Cell) |
| Algorithm | Impedance Track™ (Voltage + Current + Temp + Impedance) |
| Supply Voltage (VREGIN) | 2.8 V to 4.5 V |
| Operating Current (Normal) | 118 µA (Average) |
| Sleep Mode Current | 23 µA |
| Hibernate Mode Current | 8 µA |
| LDO Output Voltage | Integrated 2.5 VDC |
| Communication Interface | I2C (up to 400 kHz) |
| Sense Resistor Range | 5 mΩ to 20 mΩ (Typical 10 mΩ) |
| ADC Resolution | 14-bit (Voltage/Temperature) / 15-to-22 bit (Coulomb Counter) |
| Capacity Support | Up to 14,500 mAh (standard); up to 32,000 mAh (extended) |
| Package Type | 15-ball DSBGA (NanoFree™) |
| Dimensions | 2.61 mm × 1.96 mm |
| Operating Temperature | -40°C to 85°C |
3. Pin Configuration and Functions
In the Xiaomi Redmi Y1, the IC is typically found near the battery connector on the PCB. The 15-pin layout is designed for maximum space efficiency.
| Pin Name | Description | Function in Xiaomi Y1 |
| BAT | Battery Voltage Sense | Monitors the actual cell voltage. |
| SRP / SRN | Sense Resistor Input | Measures current flow (charging/discharging). |
| SCL / SDA | I2C Clock / Data | Sends battery data (%) to the Snapdragon processor. |
| TS | Thermistor Input | Monitors battery temperature via the battery’s NTC. |
| SOC_INT | Interrupt Output | Alerts the system when the battery reaches low levels. |
| BAT_LOW | Battery Low Indicator | Hardware signal for critical power states. |
| VCC | Processor Power | Internal 2.5V supply for the IC’s logic. |
4. Key Functional Capabilities
Accurate Telemetry
The BQ27520 provides the Redmi Y1 with real-time data including:
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State of Charge (SOC): The “1% to 100%” display on your screen. BQ27520 / MI Y1 Charging Mobile Phone IC
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Time-to-Empty (TTE): Predicting how many minutes remain based on current usage. BQ27520 / MI Y1 Charging Mobile Phone IC
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State of Health (SOH): Reporting the battery’s degradation level. BQ27520 / MI Y1 Charging Mobile Phone IC
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Full Charge Capacity (FCC): Adjusting for the fact that a 3080mAh battery might only hold 2500mAh after 500 cycles. BQ27520 / MI Y1 Charging Mobile Phone IC
Safety and Protection
While it doesn’t “cut” the power like a protection board (PCM), it acts as a secondary safety layer by:
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Over-temperature detection: Triggering a “Phone too hot” warning.
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Short-circuit detection: Monitoring extreme current spikes through the sense resistor.
5. Implementation in Xiaomi Redmi Y1
In the Redmi Y1, the BQ27520 is integrated into the Power Management Integrated Circuit (PMIC) ecosystem. It communicates directly with the Qualcomm Snapdragon 435 chipset.
Note for Repair Technicians: If a Redmi Y1 is stuck at 0%, won’t charge despite a new battery, or displays “Battery Temperature Low,” the BQ27520 is often the culprit. Because it is a BGA (Ball Grid Array) chip, it requires professional microsoldering tools to replace.
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