Overview
The BQ2057TTSG4, produced by Texas Instruments, is an advanced lithium-ion (Li-ion) and lithium-polymer (Li-pol) linear charge-management IC. This component is designed for cost-sensitive and compact portable electronics, offering high-accuracy current and voltage regulation, battery conditioning, temperature monitoring, charge termination, charge-status indication, and AutoComp™ charge-rate compensation in a single 8-pin IC. Available in SOIC, TSSOP, and MSOP package options, it caters to a wide range of end applications.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC with respect to GND) | -0.3 | 18 | V | |
| Operating Free-Air Temperature Range | -20 | 70 | °C | |
| Output Voltage (VO(REG)) | 8.119 | 8.20 | 8.282 | V (BQ2057T) |
| Current Regulation Threshold | 103.6 | 125 | 137.5 | mV (High-side sensing) |
| Charge Termination Current Detect Threshold | -30 | -14 | -4 | mV |
| Precharge Threshold | 5.9 | 6.1 | 6.22 | V (BQ2057T) |
| Junction-to-Ambient Thermal Resistance | 157.1 | °C/W (SOIC, TSSOP) | ||
| Junction-to-Ambient Thermal Resistance | 121.9 | °C/W (MSOP) |
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.
- Three-phase charging: conditioning, constant current, and constant voltage.
- Charge suspension if battery temperature is outside user-defined thresholds.
Applications
- Telematics control units.
- Aftermarket Telematics.
- Gaming and computer accessories.
- Portable medical equipment.
- EPOS card readers.
Q & A
- What is the BQ2057TTSG4 used for? The BQ2057TTSG4 is used for managing the charging of lithium-ion (Li-ion) and lithium-polymer (Li-pol) battery packs in portable electronics.
- What are the available package options for the BQ2057TTSG4? The BQ2057TTSG4 is available in SOIC, TSSOP, and MSOP package options.
- What is the operating temperature range of the BQ2057TTSG4? The operating temperature range is -20°C to 70°C.
- How does the BQ2057TTSG4 manage battery temperature? The BQ2057TTSG4 continuously monitors battery temperature using an external thermistor and suspends charge if the temperature is outside user-defined thresholds.
- What are the three phases of charging in the BQ2057TTSG4? The three phases are conditioning, constant current, and constant voltage.
- How does the AutoComp feature work? The AutoComp feature allows for dynamic compensation for the internal impedance of the battery pack during charge, reducing charging time.
- What is the charge termination threshold for the BQ2057TTSG4? The charge termination threshold is when the current tapers off to the I(TERM) threshold.
- Can the BQ2057TTSG4 restart charging automatically? Yes, the BQ2057TTSG4 automatically restarts the charge if the battery voltage falls below the V(RCH) threshold.
- How is current regulation achieved in the BQ2057TTSG4? Current regulation is achieved by monitoring the voltage drop across a sense resistor connected to the SNS pin.
- What types of thermistors can be used with the BQ2057TTSG4 for temperature monitoring? Both negative-temperature coefficient (NTC) and positive-temperature coefficient (PTC) thermistors can be used.
