1 Features
1• Charging
– 1% Charge Voltage Accuracy
– 10% Charge Current Accuracy low–
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: 4.35 V with
bq25100H/01H, 4.30 V with bq25100A
• 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
– Operation over JEITA Range via Battery
NTC – 1/2 Fast-Charge-Current at Cold, 4.06
V (bq25100/01) or 4.2 V (bq25100H/01H) at
Hot
– 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 bq2510x series of devices are highly integrated
Li-Ion and Li-Pol linear chargers targeted at space- limited portable applications. The high input voltage
range with input overvoltage protection supports low–
cost unregulated adapters.
The bq2510x 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 bq2510x. The fast
charge current value is also programmable via an
external resistor.