1FEATURES
2· Li-Ion Or Li-Pol Charge Management and
Synchronous DC-DC Power Conversion In a
Single Chip
· Optimized for Powering Bluetooth™ Headsets
and Accessories
· Charges and Powers the System from Either
the AC Adapter or USB with Autonomous
Power Source Selection
· Integrated USB Charge Control with
Selectable 100 mA and 500 mA Charge Rates
· Integrated Power FET and Current Sensor for
Up to 500 mA Charge Applications AND
100 mA DC-DC Controller with Integrated
FETs
· Reverse Leakage Protection Prevents Battery
Drainage
· Automatic Power Save Mode For High
Efficiency at Low Current, or Forced PWM for
Frequency Sensitive Applications
· 3.5 mm ´ 4.5 mm QFN Package

APPLICATIONS
· Bluetooth™ Headsets
· Bluetooth™ Accessories
· Low-Power Handheld Devices

DESCRIPTION
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.