BQ 2752 Original Mobile Phone IC
Enhance Your Mobile Device’s Performance
The BQ 2752 Original Mobile Phone IC is engineered to optimize and restore your smartphone’s internal operations with precision and reliability. Ideal for maintenance or repairs, this IC ensures your device functions at its best. BQ 2752 Original Mobile Phone IC
Unmatched Reliability and Compatibility
Designed for seamless integration, the BQ 2752 IC is compatible with various mobile phone models, delivering consistent performance. Its original make guarantees durability and longevity, making it a dependable choice for all your repair needs.
Quick and Efficient Repair Solution
Simplify your repair process with the BQ 2752 Mobile Phone IC. Its straightforward application reduces downtime, allowing your mobile phone to get back to optimal performance quickly and effortlessly.
The BQ27520-G4 (often referred to in repair circles as the BQ2752) is a high-precision, system-side battery fuel gauge IC developed by Texas Instruments. It is a staple in the mobile phone industry, utilized by major manufacturers to provide accurate state-of-charge (SOC) data, battery health monitoring, and safety alerts.
Unlike traditional “coulomb counters,” this IC uses TI’s patented Impedance Track™ technology, which measures battery impedance in real-time to account for aging, temperature fluctuations, and discharge rates.
Technical Specifications Table
| Category | Parameter | Specification Details |
| General | Manufacturer | Texas Instruments (TI) |
| Part Number | BQ27520-G4 (commonly BQ2752) | |
| Application | Smartphones, Tablets, Digital Cameras | |
| Battery Support | Chemistry | Li-Ion / Li-Polymer |
| Cell Count | Single-series cell ($1S$) | |
| Capacity Range | $100\text{ mAh}$ to $32,000\text{ mAh}$ | |
| Electrical | Input Voltage ($V_{BAT}$) | $2.7\text{ V}$ to $4.5\text{ V}$ |
| LDO Output | Integrated $2.5\text{ VDC}$ LDO | |
| Sense Resistor | External low-value ($10\text{ m}\Omega$ typical) | |
| Supply Current | $118\text{ }\mu\text{A}$ (Normal Mode) | |
| Sleep Current | $<10\text{ }\mu\text{A}$ | |
| Communication | Interface | $I^2C$ (up to $400\text{ kHz}$) |
| Memory | $32\text{ bytes}$ scratch-pad FLASH NVM | |
| Performance | Algorithm | Impedance Track™ Technology |
| Reporting | SOC (%), Capacity (mAh), State of Health (%) | |
| Error Margin | Typically $<1\%$ over battery life | |
| Physical | Package Type | $15\text{-pin}$ NanoFree™ (DSBGA) |
| Dimensions | $2.61\text{ mm} \times 1.96\text{ mm}$ | |
| Operating Temp | $-40\text{°C}$ to $+85\text{°C}$ |
Core Features and Functionality
1. Impedance Track™ Technology
The standout feature of the BQ2752 is its ability to model the battery’s discharge curve dynamically. As batteries age, their internal resistance increases. This IC monitors that change, ensuring that “10%” on your phone screen remains an accurate reflection of the remaining runtime, even after two years of use. BQ 2752 Original Mobile Phone IC
2. System-Side Implementation
Unlike “pack-side” gauges that live inside the battery plastic, the BQ2752 resides on the system mainboard. This allows phone manufacturers to use cheaper battery packs without integrated logic, while still maintaining high-end power management. BQ 2752 Original Mobile Phone IC
3. Comprehensive Reporting
The IC provides the system microcontroller with a wealth of data through the $I^2C$ bus:
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Time-to-Empty: Predicts how long the device will stay powered based on current load. BQ 2752 Original Mobile Phone IC
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State-of-Health (SOH): Estimates the “true” maximum capacity compared to the design capacity. BQ 2752 Original Mobile Phone IC
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Temperature: Uses an external thermistor or internal sensor to prevent charging in extreme conditions. BQ 2752 Original Mobile Phone IC
4. Low Power Consumption
Designed for mobile efficiency, the IC features multiple power modes: BQ 2752 Original Mobile Phone IC
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Normal: Active monitoring. BQ 2752 Original Mobile Phone IC
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Sleep: Reduces frequency of measurements to save power. BQ 2752 Original Mobile Phone IC
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Hibernate: Near-zero power draw when the device is completely off. BQ 2752 Original Mobile Phone IC
Pin Configuration (15-Ball DSBGA)
| Ball | Signal | Description |
| A1 | SCL | $I^2C$ Clock Input |
| A2 | SDA | $I^2C$ Data I/O |
| B1 | SOC_INT | State-of-Charge Interrupt Output |
| B2 | BAT_GD | Battery Good Indicator |
| C1 | VSS | Ground |
| C3 | SRP/SRN | Analog inputs for Sense Resistor (Current monitoring) |
| D2 | CE | Chip Enable |
| D3 | TS | Thermistor Voltage Sense Input |
Use Cases in Mobile Repair
In the context of mobile phone repair (such as iPhones or Android flagship devices), a faulty BQ2752 often manifests as:
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The phone failing to report the correct battery percentage. BQ 2752 Original Mobile Phone IC
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Sudden shutdowns when the battery supposedly has 20–30% remaining. BQ 2752 Original Mobile Phone IC
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“Battery not recognized” errors. BQ 2752 Original Mobile Phone IC
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Charging being disabled due to false temperature readings. BQ 2752 Original Mobile Phone IC
Note: When replacing this IC, technicians must ensure the solder balls are perfectly aligned due to the tiny $0.5\text{ mm}$ pitch, and the firmware (Gold Image) may need to be reloaded if the IC is not pre-programmed for the specific phone model.
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