Overview
The BQ2057WSNTRG4, produced by Texas Instruments, is an advanced linear charge management IC designed for single and dual-cell Li-ion or Li-pol battery packs. This component is ideal for applications requiring precise voltage regulation and efficient charging. It offers four fixed-voltage versions: 4.1 V, 4.2 V, 8.2 V, and 8.4 V, making it versatile for various battery configurations. The BQ2057WSNTRG4 features a small footprint and requires a minimal number of external components, simplifying the design process.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | - | 15 | V |
| Operating Free-Air Temperature Range (TA) | -20 | - | 70 | °C |
| VCC Current (I(VCC)) | 2 | 4 | - | mA |
| VCC Sleep Current (I(VCCS)) | 10 | - | - | µA |
| Output Voltage (VO(REG)) for BQ2057W | 8.317 | 8.40 | 8.484 | V |
| Current Regulation Threshold (V(SNS)) | 103.6 | 125 | 137.5 | mV |
| Charge Termination Current Detect Threshold (I(TERM)) | -30 | -14 | -4 | mV |
| Input Bias Current on BAT Pin (IIB(BAT)) | 1 | - | - | µA |
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.
- Precise voltage regulation with an accuracy better than ±1% over the operating-temperature and supply-voltage ranges.
- AutoComp feature for dynamic compensation of battery pack internal impedance to reduce charging time.
- Automatic restart of charge if the battery voltage falls below the V(RCH) threshold.
- High-side and low-side current sensing configurations.
- Temperature sensing circuit immune to VCC fluctuations.
Applications
The BQ2057WSNTRG4 is suitable for a variety of applications including portable electronics, power tools, and any device that uses Li-ion or Li-pol battery packs. It is particularly useful in designs where space is limited and precise battery management is crucial.
Q & A
- What are the fixed-voltage versions available for the BQ2057WSNTRG4? The BQ2057WSNTRG4 is available in four fixed-voltage versions: 4.1 V, 4.2 V, 8.2 V, and 8.4 V.
- What is the operating temperature range for the BQ2057WSNTRG4? The operating free-air temperature range is -20°C to 70°C.
- How does the AutoComp feature work? The AutoComp feature allows for dynamic compensation of the internal impedance of the battery pack during charge, reducing charging time.
- What are the current sensing configurations available? The BQ2057WSNTRG4 supports both high-side and low-side current sensing configurations.
- How does the temperature sensing circuit work? The temperature sensing circuit is immune to VCC fluctuations and uses external voltage dividers and internal thresholds to determine if charging is allowed.
- What happens if the battery voltage falls below the V(RCH) threshold? The BQ2057WSNTRG4 automatically restarts the charge if the battery voltage falls below the V(RCH) threshold.
- What is the typical VCC current for the BQ2057WSNTRG4? The typical VCC current is 4 mA.
- What is the input bias current on the BAT pin? The input bias current on the BAT pin is 1 µA.
- Can other regulation voltages be achieved with the BQ2057WSNTRG4? Yes, other regulation voltages can be achieved by using a voltage divider between the positive and negative terminals of the battery pack.
- What is the junction-to-ambient thermal resistance for the SOIC package? The junction-to-ambient thermal resistance for the SOIC package is 157.1 °C/W.
