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.