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.