Overview
The BQ2057WSNTR is an advanced linear charge-management IC designed by Texas Instruments for cost-sensitive and compact portable electronics. This IC is part of the BQ2057 series, which supports both lithium-ion (Li-ion) and lithium-polymer (Li-pol) batteries. It integrates 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 package.
The BQ2057WSNTR is available in an 8-SOIC package, making it suitable for a wide range of applications requiring efficient and safe battery charging.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Package | 8-SOIC (0.154", 3.90mm Width) | Package type and dimensions |
| Battery Chemistry | Lithium-Ion/Polymer | Supported battery types |
| Number of Cells | 2 | Number of cells supported |
| Charge Current - Max | Programmable | Maximum charge current capability |
| Battery Pack Voltage | 8.4V | Maximum battery pack voltage |
| Voltage - Supply (Max) | 15V | Maximum supply voltage |
| Operating Temperature | -20°C ~ 70°C (TA) | Operating temperature range |
| Output Voltage Regulation | ±1% accuracy over operating temperature and supply voltage ranges | Accuracy of voltage regulation |
| Charge Termination Detection | -30 to -4 mV (I(TERM)) | Charge termination current detect threshold |
| Temperature Monitoring | External thermistor, V(TS1) and V(TS2) thresholds | Temperature monitoring and thresholds |
Key Features
- High-Accuracy Regulation: The BQ2057WSNTR offers high-accuracy current and voltage regulation, ensuring precise charging of lithium-ion and lithium-polymer batteries.
- Battery Conditioning: The IC includes a battery conditioning phase to handle low-voltage batteries, precharging them with a low current before the main charging phases.
- Temperature Monitoring: Continuous temperature monitoring using an external thermistor, with charge inhibition until the battery temperature is within user-defined thresholds.
- AutoComp Charge-Rate Compensation: A proprietary technique to dynamically compensate for the internal impedance of the battery pack during charging, reducing charging time.
- Charge Status Indication: Provides charge-status indication, allowing for real-time monitoring of the charging process.
- Flexible Packaging: Available in 8-SOIC, MSOP, TSSOP, and SOIC package options to fit various application needs.
Applications
- Portable Electronics: Ideal for compact and cost-sensitive portable devices such as smartphones, tablets, and handheld gaming consoles.
- Telematics Control Units: Suitable for automotive telematics systems requiring reliable battery charging.
- Aftermarket Telematics: Used in aftermarket telematics devices for vehicles.
- Gaming and Computer Accessories: Applies to gaming peripherals and computer accessories that require efficient battery management.
- Portable Medical Equipment: Used in medical devices that need reliable and safe battery charging.
- EPOS Card Readers: Suitable for point-of-sale (EPOS) card readers and other payment terminals.
Q & A
- What is the BQ2057WSNTR used for?
The BQ2057WSNTR is a linear charge-management IC designed for lithium-ion and lithium-polymer battery charging in portable electronics.
- What package options are available for the BQ2057WSNTR?
The BQ2057WSNTR is available in an 8-SOIC package, with other variants in the series available in MSOP, TSSOP, and SOIC packages.
- What is the maximum supply voltage for the BQ2057WSNTR?
The maximum supply voltage for the BQ2057WSNTR is 15V.
- How does the BQ2057WSNTR handle temperature monitoring?
The BQ2057WSNTR continuously monitors battery temperature using an external thermistor and inhibits charging if the temperature is outside user-defined thresholds.
- What is the AutoComp feature in the BQ2057WSNTR?
The AutoComp feature is a proprietary technique that dynamically compensates for the internal impedance of the battery pack during charging, reducing charging time.
- What are the typical applications of the BQ2057WSNTR?
The BQ2057WSNTR is typically used in portable electronics, telematics control units, aftermarket telematics, gaming and computer accessories, portable medical equipment, and EPOS card readers.
- How accurate is the voltage regulation of the BQ2057WSNTR?
The voltage regulation accuracy of the BQ2057WSNTR is better than ±1% over the operating temperature and supply voltage ranges.
- Can the BQ2057WSNTR handle multiple cell configurations?
Yes, the BQ2057WSNTR supports single and dual cell configurations with fixed-voltage versions available for 4.1V, 4.2V, 8.2V, and 8.4V.
- How does the BQ2057WSNTR terminate the charging process?
The BQ2057WSNTR terminates charging when the current tapers to the charge termination threshold (I(TERM)).
- What happens if the battery voltage falls below the recharge threshold after charging is complete?
If the battery voltage falls below the V(RCH) threshold, the BQ2057WSNTR automatically restarts the charging process.
