Overview
The BQ2057TTSTR, produced by Texas Instruments, is an advanced linear charge-management IC designed for cost-sensitive and compact portable electronics. This IC supports the charging of lithium-ion (Li-ion) and lithium-polymer (Li-pol) batteries. It integrates high-accuracy current and voltage regulation, battery conditioning, temperature monitoring, charge termination, and charge-status indication into a single 8-pin package. The BQ2057TTSTR is available in various package options, including MSOP, TSSOP, and SOIC, to fit a wide range of end applications.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Package | 8-TSSOP (0.173", 4.40mm Width) | |
| Battery Chemistry | Lithium-Ion/Polymer | |
| Number of Cells | 2 | |
| Charge Current | Constant - Programmable | Up to 2000mA |
| Battery Pack Voltage | 8.2V | Fixed voltage version |
| Voltage Regulation Accuracy | Better than ±1% | Over operating-temperature and supply-voltage ranges |
| Supply Voltage (Max) | 15V | |
| Operating Temperature | -20°C to 70°C (TA) | |
| Charge Termination Threshold | I(TERM) | Charge stops when current tapers to this threshold |
| Precharge Threshold | V(min) | Precharge current regulation kicks in below this voltage |
| Temperature Monitoring | Continuous monitoring using external thermistor | Charging inhibited outside user-defined temperature thresholds |
Key Features
- High-accuracy current and voltage regulation
- Battery conditioning and charge-status indication
- Temperature monitoring with external thermistor
- AutoComp™ charge-rate compensation to reduce charging time
- Charge termination and automatic restart based on battery voltage
- Support for high-side and low-side current sensing configurations
- Optional voltage divider for nonstandard regulation voltages
Applications
- Portable medical equipment
- Gaming and computer accessories
- Telematics control units and aftermarket telematics
- EPOS card readers
- Other compact portable electronics
Q & A
- What is the BQ2057TTSTR used for? The BQ2057TTSTR is used for advanced linear charge management of lithium-ion and lithium-polymer batteries in portable electronics.
- What are the available package options for the BQ2057TTSTR? The BQ2057TTSTR is available in MSOP, TSSOP, and SOIC packages.
- What is the maximum charge current of the BQ2057TTSTR? The maximum charge current is up to 2000mA and is programmable.
- How does the BQ2057TTSTR monitor battery temperature? The BQ2057TTSTR continuously monitors battery temperature using an external thermistor.
- 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 AutoComp feature work? The AutoComp feature allows for safe and dynamic compensation for the internal impedance of the battery pack during charge, reducing charging time.
- What are the fixed voltage versions available for the BQ2057TTSTR? The fixed voltage versions available are 4.1 V, 4.2 V, 8.2 V, and 8.4 V.
- How does the BQ2057TTSTR terminate the charge cycle? The charge cycle is terminated when the current tapers to the charge termination threshold, I(TERM).
- Can the BQ2057TTSTR restart the charge cycle automatically? Yes, the BQ2057TTSTR automatically restarts the charge cycle if the battery voltage falls below the V(RCH) threshold.
- What is the operating temperature range of the BQ2057TTSTR? The operating temperature range is -20°C to 70°C (TA).
