The bq2954 Li-Ion Charge-Management IC uses a flexible pulse-width modulation regulator to control voltage and current during charging. The regulator frequency is set by an external capacitor for design flexibility. The switch-mode design minimizes power dissipation.
●For safety, the bq2954 inhibits fast charging until the battery voltage and temperature are within configured limits. If the battery voltage is less than the low-voltage threshold, the bq2954 provides low-current conditioning of the battery.
●For charge qualification, the bq2954 uses an external thermistor to measure battery temperature. Charging begins when power is applied or the battery is inserted
●The bq2954 charges a battery in two phases. First a constant-current phase replenishes approximately 70% of battery capacity. Then a voltage- regulation phase completes the battery charge.
●The bq2954 provides status indications of all charger states and faults for accurate determination of the battery and charge-system conditions.
● Safe charge of Li-Ion battery packs
● Pulse-width modulation control for current and voltage regulation
● Programmable high-side/low-side current-sense
● Fast charge terminated by selectable minimum current; safety backup termination at maximum time
● Precharge qualification detects shorted or damaged cells and conditions battery
● Charging continuously qualified by temperature and voltage limits
● Direct LED control outputs to display charge status and fault conditions
