The bq2501x series are highly integrated charge and
power management devices targeted at space-limited bluetooth applications. The
bq2501x series offer integrated power FET and current sensor for charge
control, reverse blocking protection, high accuracy current and voltage
regulation, charge status, charge termination, and a highly efficient and
low-power dc-dc converter in a small package.
The bq2501x charges the battery in three phases:
conditioning, constant current and constant voltage. Charge is terminated based
on minimum current. An internal charge timer provides a backup safety feature
for charge termination. The bq2501x automatically re-starts the charge if the
battery voltage falls below an internal threshold. The bq2501x automatically
enters sleep mode when VCC supply is
removed.
The integrated low-power high-efficiency dc-dc converter is
designed to operate directly from a single-cell Li-Ion or Li-Pol battery pack.
The output voltage is either adjustable from 0.7 V to VBAT (bq25010), fixed at
3.3 V (bq25011), or fixed at 1.8 V (bq25012), and is capable of delivering up
to 150-mA of load current. The dc-dc converter operates at a synchronized 1 MHz
switching frequency allowing for the use of small inductors.
