Overview
The BQ2057TTSTRG4, produced by Texas Instruments, is an advanced linear charge-management IC designed for lithium-ion (Li-ion) and lithium-polymer (Li-pol) battery packs. This IC is ideal for cost-sensitive and compact portable electronics, offering high-accuracy current and voltage regulation, battery conditioning, temperature monitoring, charge termination, and charge-status indication. It is available in various package options, including SOIC, TSSOP, and MSOP, to fit a wide range of end applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC with respect to GND) | −0.3 to 18 | V |
| Operating Free-Air Temperature Range | −20 to 70 | °C |
| Output Voltage (VO(REG)) | 8.119 to 8.282 (for BQ2057T) | V |
| Current Regulation Threshold | 103.6 to 137.5 mV (high-side sensing) | mV |
| Charge Termination Current Detect Threshold | −30 to −4 mV | mV |
| Precharge Threshold | 5.9 to 6.22 V (for BQ2057T) | V |
| Precharge Current Regulation | Approximately 10% of the regulation current | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 157.1 (SOIC/TSSOP), 121.9 (MSOP) | °C/W |
Key Features
- Ideal for single (4.1 V or 4.2 V) and dual-cell (8.2 V or 8.4 V) Li-ion or Li-pol packs.
- Requires a small number of external components.
- High-accuracy current and voltage regulation.
- Battery conditioning, temperature monitoring, charge termination, and charge-status indication.
- AutoComp™ charge-rate compensation to reduce charging time.
- Continuous battery temperature monitoring using an external thermistor.
- Charge phases include conditioning, constant current, and constant voltage.
- Supports high-side and low-side current sensing configurations.
Applications
- Telematics control units.
- Aftermarket telematics.
- Gaming and computer accessories.
- Portable medical equipment.
- EPOS card readers.
Q & A
- What is the BQ2057TTSTRG4 used for? The BQ2057TTSTRG4 is used for managing the charging of lithium-ion and lithium-polymer battery packs in portable electronics.
- What are the available package options for the BQ2057TTSTRG4? The BQ2057TTSTRG4 is available in SOIC, TSSOP, and MSOP package options.
- What is the operating temperature range of the BQ2057TTSTRG4? The operating temperature range is −20°C to 70°C.
- How does the BQ2057TTSTRG4 regulate charging? The BQ2057TTSTRG4 regulates charging in three phases: conditioning, constant current, and constant voltage.
- What is the AutoComp feature in the BQ2057TTSTRG4? The AutoComp feature allows for dynamic compensation of the internal impedance of the battery pack during charging, reducing charging time.
- How does the BQ2057TTSTRG4 monitor battery temperature? The BQ2057TTSTRG4 continuously monitors battery temperature using an external thermistor and compares it against internal temperature thresholds.
- What happens if the battery temperature is outside the allowed range? Charging is suspended until the battery temperature is within the allowed range.
- How does the BQ2057TTSTRG4 handle low battery voltage? If the battery voltage is below the precharge threshold, the BQ2057TTSTRG4 uses a precharge phase to condition the battery.
- What is the charge termination condition for the BQ2057TTSTRG4? Charging is terminated when the current tapers off to the charge termination threshold.
- Can the BQ2057TTSTRG4 restart charging automatically? Yes, the BQ2057TTSTRG4 automatically restarts the charge cycle if the battery voltage falls below the V(RCH) threshold.
