This product is a lithium battery charging management IC, which is applied to small portable electronic products. Its features are integrated with high-precision current and voltage regulation, battery status detection, temperature monitoring, charge termination, charge status indication and AutoComp.
The bq2057 series advanced Lithium-ion (Li-ion) and Lithium-Polymer (Li-Pol) 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. MSOP, TSSOP, and SOIC package options are offered to fit a wide range of end applications.
The bq2057 continuously measures battery temperature using an external thermistor. For safety, the bq2057 inhibits charge until the battery temperature is within user-defined thresholds. The bq2057 then charges the battery in three phases: conditioning, constant current, and constant voltage. If the battery voltage is below the low-voltage threshold, V(min), the bq2057 precharges using a low current to condition the battery.
| Voltage regulation accuracy | Better than +1% |
|---|---|
| Dropout voltage | 0.3 V |
| Package options | 8-Pin SOIC, 8-Pin TSSOP, 8-Pin MSOP |
It is 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.
Yes, it includes optional cell-temperature monitoring before and during charge.
It provides dynamic compensation of the battery pack's internal impedance to reduce charge time.