This document introduces the features of the BENCHMARQ bq2057 series advanced Li-Ion linear charge-management ICs, including 0.3V dropout voltage, dynamic compensation of battery pack's internal impedance, optional temperature-monitoring before and during charge, integrated voltage and current regulation with programmable charge-current and high- or low-side current sensing, integrated cell conditioning for reviving deeply discharged cells and minimizing heat dissipation during initial stage of charge, better than ±1% voltage regulation accuracy, charge status output for LED or host processor interface, automatic battery-recharge feature, charge termination by minimum current and low-power sleep mode.
The Texas Instruments bq2057 series advanced Li-Ion linear charge-management ICs are designed for cost-sensitive and compact portable electronics. They combine 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.
The device continuously measures battery temperature using an external thermistor and inhibits charge until the battery temperature is within user-defined thresholds. It charges the battery in three phases: conditioning, constant current, and constant voltage, with better than +1% voltage regulation accuracy.
| Dropout Voltage | 0.3V |
|---|---|
| Voltage Regulation Accuracy | Better than +1% |
| Available Voltages | 4.1V, 4.2V, 8.2V, 8.4V |
| Operating Temperature Range | User-defined thresholds |
The bq2057 has a dropout voltage of 0.3V.
It continuously measures battery temperature using an external thermistor and inhibits charge if the temperature is outside the Vts1 to Vts2 range.
The bq2057 is offered in four fixed-voltage versions: 4.1V, 4.2V, 8.2V, and 8.4V.