The BQ2057WTSG4 is a Lithium-ion (Li-ion) and Lithium-polymer (Li-pol) linear charge-management Integrated Circuit which is designed for compact portable electronics. The BQ2057 continuously measures battery temperature using an external thermistor. For safety, the charge controller inhibits charge until the battery temperature is within user-defined thresholds. The charge controller 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 charge controller precharges using a low current to condition the battery. The conditioning charge rate is approximately 10% of the regulation current. The conditioning current also minimizes heat dissipation in the external pass element during the initial stage of the charge. After conditioning, the charge controller applies a constant current to the battery. An external sense-resistor sets the current.
● Requires small number of external components
● Better than ±1% voltage regulation accuracy with pre-set voltages
● AutoComp™ Dynamic compensation of battery pack"s internal impedance to reduce charge time
● Optional cell-temperature monitoring before and during charge
● Integrated voltage and current regulation with programmable charge-current
● Integrated cell conditioning for reviving deeply discharged cells
● Charge status output for single or dual led or host processor interface
● Automatic battery-recharge feature
● Charge termination by minimum current
● Automatic low-power sleep mode when VCC is removed
● EVMs Available for quick evaluation
● Green product and no Sb/Br
