1 Features

1• Charging

– 1% Charge Voltage Accuracy

– 10% Charge Current Accuracy

– Supports Applications for Very Low Charge

Currents - 10 mA to 250 mA

– Supports Minimum 1-mA Charge Termination

Current

– Ultra Low Battery Output Leakage Current -

Maximum 75 nA

– Adjustable Termination and Precharge

Threshold

– High voltage Chemistry Support: 4.30 V

• Protection

– 30-V Input Rating; with 6.5-V Input

Overvoltage Protection

– Input Voltage Dynamic Power Management

– 125°C Thermal Regulation; 150°C Thermal

Shutdown Protection

– OUT Short-Circuit Protection and ISET Short

Detection

– Fixed 10 Hour Safety Timer

• System

– Automatic Termination and Timer Disable

Mode (TTDM) for Absent Battery Pack

– Available in Small 1.60 mm × 0.90 mm

DSBGA Package

2 Applications

• Fitness Accessories

• Smart Watches

• Bluetooth® Headsets

• Low-Power Handheld Devices

3 Description

The bq25100B device is a highly integrated Li-Ion

and Li-Pol linear charger targeted at space-limited

portable applications. The high input voltage range

with input overvoltage protection supports low-cost

unregulated adapters.

The bq25100B has a single power output that

charges the battery. A system load can be placed in

parallel with the battery as long as the average

system load does not keep the battery from charging

fully during the 10 hour safety timer.

The battery is charged in three phases: conditioning,

constant current and constant voltage. In all charge

phases, an internal control loop monitors the IC

junction temperature and reduces the charge current

if an internal temperature threshold is exceeded.

The charger power stage and charge current sense

functions are fully integrated. The charger function

has high accuracy current and voltage regulation

loops and charge termination. The pre-charge current

and termination current threshold are programmed

via an external resistor on the bq25100B. The fast

charge current value is also programmable via an

external resistor.

References to other devices in the bq25100B family

are included in this document. For more information

on those devices, please see their respective

datasheets. This includes references to the CHG pin

and the JEITA temperature functionality.